<?xml version="1.0" encoding="utf-8"?>
<!--Generated by DFIN XBRL Instance Document - http://www.dfinsolutions.com/ - Version R3.0 - on 11-August-2022 [09:16:21] {PM}-->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#CoverPage" roleURI="http://www.businesswire.com/role/CoverPage" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#CondensedConsolidatedBalanceSheets" roleURI="http://www.businesswire.com/role/CondensedConsolidatedBalanceSheets" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#CondensedConsolidatedBalanceSheetsParenthetical" roleURI="http://www.businesswire.com/role/CondensedConsolidatedBalanceSheetsParenthetical" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#CondensedConsolidatedStatementsOfOperations" roleURI="http://www.businesswire.com/role/CondensedConsolidatedStatementsOfOperations" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#CondensedConsolidatedStatementsOfChangesInTemporaryEquityAndPermanentDeficitEquity" roleURI="http://www.businesswire.com/role/CondensedConsolidatedStatementsOfChangesInTemporaryEquityAndPermanentDeficitEquity" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#DescriptionOfOrganizationBusinessOperationsAndGoingConcernAdditionalInformationDetail" roleURI="http://www.businesswire.com/role/DescriptionOfOrganizationBusinessOperationsAndGoingConcernAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail" roleURI="http://www.businesswire.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#SummaryOfSignificantAccountingPoliciesScheduleOfClassAOrdinarySharesReflectedInTheBalanceSheetsDetail" roleURI="http://www.businesswire.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfClassAOrdinarySharesReflectedInTheBalanceSheetsDetail" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#SummaryOfSignificantAccountingPoliciesScheduleOfCalculationOfBasicAndDilutedNetIncomeLossPerOrdinaryShareDetail" roleURI="http://www.businesswire.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfCalculationOfBasicAndDilutedNetIncomeLossPerOrdinaryShareDetail" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#InitialPublicOfferingAdditionalInformationDetail" roleURI="http://www.businesswire.com/role/InitialPublicOfferingAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#PrivatePlacementAdditionalInformationDetail" roleURI="http://www.businesswire.com/role/PrivatePlacementAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#RelatedPartyTransactionsAdditionalInformationDetail" roleURI="http://www.businesswire.com/role/RelatedPartyTransactionsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#CommitmentsAndContingenciesAdditionalInformationDetail" roleURI="http://www.businesswire.com/role/CommitmentsAndContingenciesAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#TemporaryEquityAndPermanentDeficitAdditionalInformationDetail" roleURI="http://www.businesswire.com/role/TemporaryEquityAndPermanentDeficitAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#FairValueMeasurementsSummaryOfAssetsThatAreMeasuredAtFairValueOnARecurringBasisDetail" roleURI="http://www.businesswire.com/role/FairValueMeasurementsSummaryOfAssetsThatAreMeasuredAtFairValueOnARecurringBasisDetail" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#DescriptionOfOrganizationBusinessOperationsAndGoingConcern" roleURI="http://www.businesswire.com/role/DescriptionOfOrganizationBusinessOperationsAndGoingConcern" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#SummaryOfSignificantAccountingPolicies" roleURI="http://www.businesswire.com/role/SummaryOfSignificantAccountingPolicies" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#InitialPublicOffering" roleURI="http://www.businesswire.com/role/InitialPublicOffering" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#PrivatePlacement" roleURI="http://www.businesswire.com/role/PrivatePlacement" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#RelatedPartyTransactions" roleURI="http://www.businesswire.com/role/RelatedPartyTransactions" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#CommitmentsAndContingencies" roleURI="http://www.businesswire.com/role/CommitmentsAndContingencies" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#TemporaryEquityAndPermanentDeficit" roleURI="http://www.businesswire.com/role/TemporaryEquityAndPermanentDeficit" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#SubsequentEvents" roleURI="http://www.businesswire.com/role/SubsequentEvents" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#SummaryOfSignificantAccountingPoliciesPolicies" roleURI="http://www.businesswire.com/role/SummaryOfSignificantAccountingPoliciesPolicies" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#CondensedConsolidatedStatementsOfCashFlows" roleURI="http://www.businesswire.com/role/CondensedConsolidatedStatementsOfCashFlows" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#FairValueMeasurements" roleURI="http://www.businesswire.com/role/FairValueMeasurements" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#FairValueMeasurementsTables" roleURI="http://www.businesswire.com/role/FairValueMeasurementsTables" />
<roleRef xlink:type="simple" xlink:href="prok-20220630.xsd#SummaryOfSignificantAccountingPoliciesTables" roleURI="http://www.businesswire.com/role/SummaryOfSignificantAccountingPoliciesTables" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/notAll" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll" />
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/CoverPage">
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentInformationLineItems" xlink:label="loc_dei_DocumentInformationLineItems_6" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_9" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_DocumentType_9" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentInformationTable" xlink:label="loc_dei_DocumentInformationTable_3" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_DocumentInformationTable_3" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_4" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_3" xlink:to="loc_us-gaap_StatementClassOfStockAxis_4" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_5" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_4" xlink:to="loc_us-gaap_ClassOfStockDomain_5" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_5_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_4" xlink:to="loc_us-gaap_ClassOfStockDomain_5_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_7" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_5" xlink:to="loc_us-gaap_CommonClassAMember_7" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_8" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_5" xlink:to="loc_us-gaap_CommonClassBMember_8" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_10" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_AmendmentFlag_10" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressStateOrProvince" xlink:label="loc_dei_EntityAddressStateOrProvince_22" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityAddressStateOrProvince_22" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressPostalZipCode" xlink:label="loc_dei_EntityAddressPostalZipCode_23" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityAddressPostalZipCode_23" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_CityAreaCode" xlink:label="loc_dei_CityAreaCode_24" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_CityAreaCode_24" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LocalPhoneNumber" xlink:label="loc_dei_LocalPhoneNumber_25" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_LocalPhoneNumber_25" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_11" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_DocumentPeriodEndDate_11" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_12" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_DocumentFiscalYearFocus_12" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_13" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_DocumentFiscalPeriodFocus_13" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_14" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityRegistrantName_14" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_15" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityCentralIndexKey_15" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityFileNumber" xlink:label="loc_dei_EntityFileNumber_16" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityFileNumber_16" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityTaxIdentificationNumber" xlink:label="loc_dei_EntityTaxIdentificationNumber_17" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityTaxIdentificationNumber_17" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="loc_dei_EntityIncorporationStateCountryCode_18" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityIncorporationStateCountryCode_18" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressAddressLine1" xlink:label="loc_dei_EntityAddressAddressLine1_19" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityAddressAddressLine1_19" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressAddressLine2" xlink:label="loc_dei_EntityAddressAddressLine2_20" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityAddressAddressLine2_20" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressCityOrTown" xlink:label="loc_dei_EntityAddressCityOrTown_21" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityAddressCityOrTown_21" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentQuarterlyReport" xlink:label="loc_dei_DocumentQuarterlyReport_26" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_DocumentQuarterlyReport_26" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_SecurityExchangeName" xlink:label="loc_dei_SecurityExchangeName_38" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_SecurityExchangeName_38" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentTransitionReport" xlink:label="loc_dei_DocumentTransitionReport_27" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_DocumentTransitionReport_27" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_28" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityCurrentReportingStatus_28" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityInteractiveDataCurrent" xlink:label="loc_dei_EntityInteractiveDataCurrent_29" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityInteractiveDataCurrent_29" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_30" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_CurrentFiscalYearEndDate_30" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_31" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityFilerCategory_31" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityShellCompany" xlink:label="loc_dei_EntityShellCompany_32" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityShellCompany_32" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntitySmallBusiness" xlink:label="loc_dei_EntitySmallBusiness_33" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntitySmallBusiness_33" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_dei_EntityEmergingGrowthCompany_34" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityEmergingGrowthCompany_34" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityExTransitionPeriod" xlink:label="loc_dei_EntityExTransitionPeriod_35" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityExTransitionPeriod_35" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_Security12bTitle" xlink:label="loc_dei_Security12bTitle_36" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_Security12bTitle_36" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_TradingSymbol" xlink:label="loc_dei_TradingSymbol_37" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_TradingSymbol_37" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_39" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_6" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_39" use="optional" order="37" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/CondensedConsolidatedBalanceSheets">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_45" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_42" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_45" xlink:to="loc_us-gaap_StatementTable_42" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_43" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_42" xlink:to="loc_us-gaap_StatementClassOfStockAxis_43" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_44" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_43" xlink:to="loc_us-gaap_ClassOfStockDomain_44" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_44_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_43" xlink:to="loc_us-gaap_ClassOfStockDomain_44_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_52" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_44" xlink:to="loc_us-gaap_CommonClassBMember_52" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_51" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_44" xlink:to="loc_us-gaap_CommonClassAMember_51" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_46" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_45" xlink:to="loc_us-gaap_AssetsAbstract_46" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_57" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_46" xlink:to="loc_us-gaap_Assets_57" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_PrepaidInsuranceNonCurrent" xlink:label="loc_prok_PrepaidInsuranceNonCurrent_1153781" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_46" xlink:to="loc_prok_PrepaidInsuranceNonCurrent_1153781" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsHeldInTrustNoncurrent" xlink:label="loc_us-gaap_AssetsHeldInTrustNoncurrent_1153783" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_46" xlink:to="loc_us-gaap_AssetsHeldInTrustNoncurrent_1153783" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_47" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_46" xlink:to="loc_us-gaap_AssetsCurrentAbstract_47" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherPrepaidExpenseCurrent" xlink:label="loc_us-gaap_OtherPrepaidExpenseCurrent_54" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_47" xlink:to="loc_us-gaap_OtherPrepaidExpenseCurrent_54" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_55" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_47" xlink:to="loc_us-gaap_AssetsCurrent_55" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Cash" xlink:label="loc_us-gaap_Cash_53" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_47" xlink:to="loc_us-gaap_Cash_53" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_48" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_45" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_48" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_49" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_48" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_49" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_62" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_49" xlink:to="loc_us-gaap_LiabilitiesCurrent_62" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DueToRelatedPartiesCurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrent_60" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_49" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrent_60" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AccruedExpensesCurrent" xlink:label="loc_prok_AccruedExpensesCurrent_1342206" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_49" xlink:to="loc_prok_AccruedExpensesCurrent_1342206" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_1153786" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_49" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_1153786" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_NotesPayableRelatedPartyClassifiedCurrent" xlink:label="loc_prok_NotesPayableRelatedPartyClassifiedCurrent_61" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_49" xlink:to="loc_prok_NotesPayableRelatedPartyClassifiedCurrent_61" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_DeferredUnderwritingCommissions" xlink:label="loc_prok_DeferredUnderwritingCommissions_1153795" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_48" xlink:to="loc_prok_DeferredUnderwritingCommissions_1153795" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_63" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_48" xlink:to="loc_us-gaap_CommitmentsAndContingencies_63" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_1152785" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_48" xlink:to="loc_us-gaap_Liabilities_1152785" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_69" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_48" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_69" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_50" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_48" xlink:to="loc_us-gaap_StockholdersEquityAbstract_50" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_68" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_50" xlink:to="loc_us-gaap_StockholdersEquity_68" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_67" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_50" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_67" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_66" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_50" xlink:to="loc_us-gaap_AdditionalPaidInCapital_66" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_65" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_50" xlink:to="loc_us-gaap_CommonStockValue_65" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_64" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_50" xlink:to="loc_us-gaap_PreferredStockValue_64" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_1153810" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_48" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_1153810" use="optional" order="32" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/CondensedConsolidatedBalanceSheetsParenthetical">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_75" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_84" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_75" xlink:to="loc_us-gaap_CommonStockSharesIssued_84" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TemporaryEquitySharesOutstanding" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_1153834" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_75" xlink:to="loc_us-gaap_TemporaryEquitySharesOutstanding_1153834" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_85" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_75" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_85" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_82" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_75" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_82" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_80" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_75" xlink:to="loc_us-gaap_PreferredStockSharesIssued_80" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_79" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_75" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_79" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_83" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_75" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_83" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_72" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_75" xlink:to="loc_us-gaap_StatementTable_72" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_73" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_72" xlink:to="loc_us-gaap_StatementClassOfStockAxis_73" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_74" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_73" xlink:to="loc_us-gaap_ClassOfStockDomain_74" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_74_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_73" xlink:to="loc_us-gaap_ClassOfStockDomain_74_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_77" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_74" xlink:to="loc_us-gaap_CommonClassBMember_77" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_76" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_74" xlink:to="loc_us-gaap_CommonClassAMember_76" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_81" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_75" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_81" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_78" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_75" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_78" use="optional" order="15" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/CondensedConsolidatedStatementsOfOperations">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_1152848" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_1570330" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1152848" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_1570330" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_1152843" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_1152848" xlink:to="loc_us-gaap_StatementTable_1152843" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1152844" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1152843" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1152844" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_1152845" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1152844" xlink:to="loc_us-gaap_ClassOfStockDomain_1152845" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_1152845_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1152844" xlink:to="loc_us-gaap_ClassOfStockDomain_1152845_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_1152846" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_1152845" xlink:to="loc_us-gaap_CommonClassAMember_1152846" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_1152847" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_1152845" xlink:to="loc_us-gaap_CommonClassBMember_1152847" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_1570331" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1152848" xlink:to="loc_us-gaap_EarningsPerShareBasic_1570331" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_1570332" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1152848" xlink:to="loc_us-gaap_EarningsPerShareDiluted_1570332" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_90" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1152848" xlink:to="loc_us-gaap_OperatingIncomeLoss_90" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_91" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1152848" xlink:to="loc_us-gaap_NetIncomeLoss_91" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_1153848" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1152848" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_1153848" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherIncome" xlink:label="loc_us-gaap_OtherIncome_1570013" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_1153848" xlink:to="loc_us-gaap_OtherIncome_1570013" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaap_InvestmentIncomeInterest_1153849" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_1153848" xlink:to="loc_us-gaap_InvestmentIncomeInterest_1153849" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_1570329" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1152848" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_1570329" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_89" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1152848" xlink:to="loc_us-gaap_OperatingExpenses_89" use="optional" order="16" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/CondensedConsolidatedStatementsOfChangesInTemporaryEquityAndPermanentDeficitEquity">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_109" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesOutstanding" xlink:label="loc_us-gaap_SharesOutstanding_115" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_109" xlink:to="loc_us-gaap_SharesOutstanding_115" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueIssuedForServices_116" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_109" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueIssuedForServices_116" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_RemeasurementOfOrdinarySharesToRedemptionValueTemporaryEquity" xlink:label="loc_prok_RemeasurementOfOrdinarySharesToRedemptionValueTemporaryEquity_1155778" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_109" xlink:to="loc_prok_RemeasurementOfOrdinarySharesToRedemptionValueTemporaryEquity_1155778" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_114" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_109" xlink:to="loc_us-gaap_StockholdersEquity_114" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TemporaryEquitySharesOutstanding" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_1154940" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_109" xlink:to="loc_us-gaap_TemporaryEquitySharesOutstanding_1154940" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_1154939" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_109" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_1154939" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_118" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_109" xlink:to="loc_us-gaap_NetIncomeLoss_118" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_104" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_109" xlink:to="loc_us-gaap_StatementTable_104" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_105" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_104" xlink:to="loc_us-gaap_StatementClassOfStockAxis_105" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_106" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_105" xlink:to="loc_us-gaap_ClassOfStockDomain_106" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_106_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_105" xlink:to="loc_us-gaap_ClassOfStockDomain_106_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_110" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_106" xlink:to="loc_us-gaap_CommonClassBMember_110" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_1152849" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_106" xlink:to="loc_us-gaap_CommonClassAMember_1152849" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_107" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_104" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_107" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_108" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_107" xlink:to="loc_us-gaap_EquityComponentDomain_108" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_108_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_107" xlink:to="loc_us-gaap_EquityComponentDomain_108_default" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_112" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_108" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_112" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_113" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_108" xlink:to="loc_us-gaap_RetainedEarningsMember_113" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_111" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_108" xlink:to="loc_us-gaap_CommonStockMember_111" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_117" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_109" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_117" use="optional" order="20" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/DescriptionOfOrganizationBusinessOperationsAndGoingConcernAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_DescriptionOfOrganizationAndBusinessOperationsLineItems" xlink:label="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfPrivatePlacement" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_208" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_208" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_205" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_205" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityIncorporationDateOfIncorporation" xlink:label="loc_dei_EntityIncorporationDateOfIncorporation_204" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_dei_EntityIncorporationDateOfIncorporation_204" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredOfferingCosts" xlink:label="loc_us-gaap_DeferredOfferingCosts_212" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_us-gaap_DeferredOfferingCosts_212" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockHeldInTrust" xlink:label="loc_us-gaap_CommonStockHeldInTrust_213" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_us-gaap_CommonStockHeldInTrust_213" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_TransactionCostsIncurredInConnectionWithInitialPublicOffering" xlink:label="loc_prok_TransactionCostsIncurredInConnectionWithInitialPublicOffering_209" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_prok_TransactionCostsIncurredInConnectionWithInitialPublicOffering_209" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:label="loc_us-gaap_ProceedsFromIssuanceInitialPublicOffering_207" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_us-gaap_ProceedsFromIssuanceInitialPublicOffering_207" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_1409805" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_1409805" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_DescriptionOfOrganizationAndBusinessOperationsTable" xlink:label="loc_prok_DescriptionOfOrganizationAndBusinessOperationsTable_188" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_prok_DescriptionOfOrganizationAndBusinessOperationsTable_188" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_193" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsTable_188" xlink:to="loc_srt_RangeAxis_193" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_194" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_193" xlink:to="loc_srt_RangeMember_194" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_194_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_193" xlink:to="loc_srt_RangeMember_194_default" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_191" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsTable_188" xlink:to="loc_us-gaap_StatementClassOfStockAxis_191" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_192" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_191" xlink:to="loc_us-gaap_ClassOfStockDomain_192" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_192_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_191" xlink:to="loc_us-gaap_ClassOfStockDomain_192_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_199" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_192" xlink:to="loc_us-gaap_CommonClassAMember_199" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_1570166" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_192" xlink:to="loc_us-gaap_CommonClassBMember_1570166" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_195" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsTable_188" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_195" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_196" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_195" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_196" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_196_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_195" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_196_default" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrivatePlacementMember" xlink:label="loc_us-gaap_PrivatePlacementMember_203" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_196" xlink:to="loc_us-gaap_PrivatePlacementMember_203" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OverAllotmentOptionMember" xlink:label="loc_us-gaap_OverAllotmentOptionMember_202" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_196" xlink:to="loc_us-gaap_OverAllotmentOptionMember_202" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IPOMember" xlink:label="loc_us-gaap_IPOMember_201" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_196" xlink:to="loc_us-gaap_IPOMember_201" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityInterestIssuedOrIssuableByTypeAxis" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_1409782" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsTable_188" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_1409782" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_1409783" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_1409782" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_1409783" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_1409783_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_1409782" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_1409783_default" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_RestrictedStockRightsMember" xlink:label="loc_prok_RestrictedStockRightsMember_1409784" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_1409783" xlink:to="loc_prok_RestrictedStockRightsMember_1409784" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_1409779" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsTable_188" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_1409779" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1409780" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_1409779" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1409780" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1409780_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_1409779" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1409780_default" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_ProkidneyLpMember" xlink:label="loc_prok_ProkidneyLpMember_1409781" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1409780" xlink:to="loc_prok_ProkidneyLpMember_1409781" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_1570427" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsTable_188" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_1570427" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_1570428" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_1570427" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_1570428" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_1570428_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_1570427" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_1570428_default" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_1570429" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_1570428" xlink:to="loc_us-gaap_SubsequentEventMember_1570429" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_SharePriceRangeAxis" xlink:label="loc_prok_SharePriceRangeAxis_1409793" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsTable_188" xlink:to="loc_prok_SharePriceRangeAxis_1409793" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_SharePriceRangeDomain" xlink:label="loc_prok_SharePriceRangeDomain_1409794" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_prok_SharePriceRangeAxis_1409793" xlink:to="loc_prok_SharePriceRangeDomain_1409794" use="optional" order="37" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_SharePriceRangeDomain" xlink:label="loc_prok_SharePriceRangeDomain_1409794_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_prok_SharePriceRangeAxis_1409793" xlink:to="loc_prok_SharePriceRangeDomain_1409794_default" use="optional" order="38" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1409801" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsTable_188" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1409801" use="optional" order="39" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_1409802" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1409801" xlink:to="loc_us-gaap_RelatedPartyDomain_1409802" use="optional" order="40" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_1409802_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1409801" xlink:to="loc_us-gaap_RelatedPartyDomain_1409802_default" use="optional" order="41" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_PipeInvestorsMember" xlink:label="loc_prok_PipeInvestorsMember_1409804" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_1409802" xlink:to="loc_prok_PipeInvestorsMember_1409804" use="optional" order="42" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_DeferredUnderwritingFees" xlink:label="loc_prok_DeferredUnderwritingFees_211" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_prok_DeferredUnderwritingFees_211" use="optional" order="43" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_206" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_206" use="optional" order="44" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_1409775" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_1409775" use="optional" order="45" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Cash" xlink:label="loc_us-gaap_Cash_1167786" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_us-gaap_Cash_1167786" use="optional" order="46" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_UnderwritingFee" xlink:label="loc_prok_UnderwritingFee_210" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_prok_UnderwritingFee_210" use="optional" order="47" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_1409799" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_1409799" use="optional" order="48" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_WorkingCapital" xlink:label="loc_prok_WorkingCapital_1167789" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_prok_WorkingCapital_1167789" use="optional" order="49" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_1570431" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_1570431" use="optional" order="50" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_PaymentOfAmountFromTheTrustAccountToHolders" xlink:label="loc_prok_PaymentOfAmountFromTheTrustAccountToHolders_1570433" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_prok_PaymentOfAmountFromTheTrustAccountToHolders_1570433" use="optional" order="51" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AmountHeldInTrustAccount" xlink:label="loc_prok_AmountHeldInTrustAccount_1570434" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_DescriptionOfOrganizationAndBusinessOperationsLineItems_197" xlink:to="loc_prok_AmountHeldInTrustAccount_1570434" use="optional" order="52" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AccountingPoliciesLineItems" xlink:label="loc_prok_AccountingPoliciesLineItems_229" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AccruedPrintingExpense" xlink:label="loc_prok_AccruedPrintingExpense_1355579" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_AccruedPrintingExpense_1355579" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AccountingPoliciesTable" xlink:label="loc_prok_AccountingPoliciesTable_224" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_AccountingPoliciesTable_224" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_227" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_AccountingPoliciesTable_224" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_227" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_228" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_227" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_228" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_228_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_227" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_228_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IPOMember" xlink:label="loc_us-gaap_IPOMember_232" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_228" xlink:to="loc_us-gaap_IPOMember_232" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_1179834" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_AccountingPoliciesTable_224" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_1179834" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_1179835" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_1179834" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_1179835" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_1179835_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_1179834" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_1179835_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_225" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_AccountingPoliciesTable_224" xlink:to="loc_us-gaap_StatementClassOfStockAxis_225" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_226" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_225" xlink:to="loc_us-gaap_ClassOfStockDomain_226" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_226_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_225" xlink:to="loc_us-gaap_ClassOfStockDomain_226_default" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_230" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_226" xlink:to="loc_us-gaap_CommonClassAMember_230" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredOfferingCosts" xlink:label="loc_us-gaap_DeferredOfferingCosts_235" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_us-gaap_DeferredOfferingCosts_235" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_DeferredUnderwritingFees" xlink:label="loc_prok_DeferredUnderwritingFees_1179828" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_DeferredUnderwritingFees_1179828" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AccountingFeePayable" xlink:label="loc_prok_AccountingFeePayable_1570390" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_AccountingFeePayable_1570390" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashFDICInsuredAmount" xlink:label="loc_us-gaap_CashFDICInsuredAmount_239" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_us-gaap_CashFDICInsuredAmount_239" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_BusinessCombinationAccruedConsultingExpense" xlink:label="loc_prok_BusinessCombinationAccruedConsultingExpense_1436399" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_BusinessCombinationAccruedConsultingExpense_1436399" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AccruedDueDiligenceExpense" xlink:label="loc_prok_AccruedDueDiligenceExpense_1355590" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_AccruedDueDiligenceExpense_1355590" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AccruedRegulatoryFilingFee" xlink:label="loc_prok_AccruedRegulatoryFilingFee_1355592" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_AccruedRegulatoryFilingFee_1355592" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AccruedAccountingExpense" xlink:label="loc_prok_AccruedAccountingExpense_1355604" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_AccruedAccountingExpense_1355604" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AccruedLegalExpense" xlink:label="loc_prok_AccruedLegalExpense_1355573" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_AccruedLegalExpense_1355573" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_BusinessCombinationAccruedLegalExpense" xlink:label="loc_prok_BusinessCombinationAccruedLegalExpense_1436398" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_BusinessCombinationAccruedLegalExpense_1436398" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_UnderwritingFee" xlink:label="loc_prok_UnderwritingFee_1179827" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_UnderwritingFee_1179827" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_TransactionCostsIncurredInConnectionWithInitialPublicOffering" xlink:label="loc_prok_TransactionCostsIncurredInConnectionWithInitialPublicOffering_1179825" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AccountingPoliciesLineItems_229" xlink:to="loc_prok_TransactionCostsIncurredInConnectionWithInitialPublicOffering_1179825" use="optional" order="25" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfClassAOrdinarySharesReflectedInTheBalanceSheetsDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TemporaryEquityLineItems" xlink:label="loc_us-gaap_TemporaryEquityLineItems_1317350" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TemporaryEquityByClassOfStockTable" xlink:label="loc_us-gaap_TemporaryEquityByClassOfStockTable_1317344" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_TemporaryEquityLineItems_1317350" xlink:to="loc_us-gaap_TemporaryEquityByClassOfStockTable_1317344" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1317347" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_TemporaryEquityByClassOfStockTable_1317344" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1317347" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_1317348" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1317347" xlink:to="loc_us-gaap_ClassOfStockDomain_1317348" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_1317348_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1317347" xlink:to="loc_us-gaap_ClassOfStockDomain_1317348_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_1317349" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_1317348" xlink:to="loc_us-gaap_CommonClassAMember_1317349" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_TemporaryEquityIssaunceCosts" xlink:label="loc_prok_TemporaryEquityIssaunceCosts_1317354" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TemporaryEquityLineItems_1317350" xlink:to="loc_prok_TemporaryEquityIssaunceCosts_1317354" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_RemeasurementOfOrdinarySharesToRedemptionValueTemporaryEquity" xlink:label="loc_prok_RemeasurementOfOrdinarySharesToRedemptionValueTemporaryEquity_1317356" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TemporaryEquityLineItems_1317350" xlink:to="loc_prok_RemeasurementOfOrdinarySharesToRedemptionValueTemporaryEquity_1317356" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_RemeasurementOfCarryingValueToRedemptionValue" xlink:label="loc_prok_RemeasurementOfCarryingValueToRedemptionValue_1409836" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TemporaryEquityLineItems_1317350" xlink:to="loc_prok_RemeasurementOfCarryingValueToRedemptionValue_1409836" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:label="loc_us-gaap_ProceedsFromIssuanceInitialPublicOffering_1317352" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TemporaryEquityLineItems_1317350" xlink:to="loc_us-gaap_ProceedsFromIssuanceInitialPublicOffering_1317352" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_1317358" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TemporaryEquityLineItems_1317350" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_1317358" use="optional" order="10" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfCalculationOfBasicAndDilutedNetIncomeLossPerOrdinaryShareDetail">
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_EarningsPerShareBasicAndDilutedLineItems" xlink:label="loc_prok_EarningsPerShareBasicAndDilutedLineItems_1154678" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareReconciliationAbstract" xlink:label="loc_us-gaap_EarningsPerShareReconciliationAbstract_1154680" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_EarningsPerShareBasicAndDilutedLineItems_1154678" xlink:to="loc_us-gaap_EarningsPerShareReconciliationAbstract_1154680" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_1154681" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareReconciliationAbstract_1154680" xlink:to="loc_us-gaap_NetIncomeLoss_1154681" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_1570407" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_EarningsPerShareBasicAndDilutedLineItems_1154678" xlink:to="loc_us-gaap_EarningsPerShareBasic_1570407" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_1570408" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_EarningsPerShareBasicAndDilutedLineItems_1154678" xlink:to="loc_us-gaap_EarningsPerShareDiluted_1570408" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_BasicAndDilutedEarningsPerShareOtherDisclosuresAbstract" xlink:label="loc_prok_BasicAndDilutedEarningsPerShareOtherDisclosuresAbstract_1154682" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_EarningsPerShareBasicAndDilutedLineItems_1154678" xlink:to="loc_prok_BasicAndDilutedEarningsPerShareOtherDisclosuresAbstract_1154682" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_1570405" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_BasicAndDilutedEarningsPerShareOtherDisclosuresAbstract_1154682" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_1570405" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_1570406" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_BasicAndDilutedEarningsPerShareOtherDisclosuresAbstract_1154682" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_1570406" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_EarningsPerShareBasicAndDilutedTable" xlink:label="loc_prok_EarningsPerShareBasicAndDilutedTable_1154677" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_prok_EarningsPerShareBasicAndDilutedLineItems_1154678" xlink:to="loc_prok_EarningsPerShareBasicAndDilutedTable_1154677" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1154688" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_prok_EarningsPerShareBasicAndDilutedTable_1154677" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1154688" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_1154689" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1154688" xlink:to="loc_us-gaap_ClassOfStockDomain_1154689" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_1154689_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1154688" xlink:to="loc_us-gaap_ClassOfStockDomain_1154689_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_1154690" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_1154689" xlink:to="loc_us-gaap_CommonClassAMember_1154690" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_1154691" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_1154689" xlink:to="loc_us-gaap_CommonClassBMember_1154691" use="optional" order="13" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/InitialPublicOfferingAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_249" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_255" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_249" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_255" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_254" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_249" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_254" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfStockByClassTable" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_242" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_249" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_242" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_247" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_242" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_247" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_248" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_247" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_248" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_248_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_247" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_248_default" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IPOMember" xlink:label="loc_us-gaap_IPOMember_252" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_248" xlink:to="loc_us-gaap_IPOMember_252" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OverAllotmentOptionMember" xlink:label="loc_us-gaap_OverAllotmentOptionMember_253" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_248" xlink:to="loc_us-gaap_OverAllotmentOptionMember_253" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_243" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_242" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_243" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_244" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_243" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_244" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_244_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_243" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_244_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_245" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_242" xlink:to="loc_us-gaap_StatementClassOfStockAxis_245" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_246" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_245" xlink:to="loc_us-gaap_ClassOfStockDomain_246" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_246_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_245" xlink:to="loc_us-gaap_ClassOfStockDomain_246_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_251" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_246" xlink:to="loc_us-gaap_CommonClassAMember_251" use="optional" order="15" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/PrivatePlacementAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_265" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfPrivatePlacement" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_271" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_265" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_271" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_269" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_265" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_269" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_270" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_265" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_270" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfStockByClassTable" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_258" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_265" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_258" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_263" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_258" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_263" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_264" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_263" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_264" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_264_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_263" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_264_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrivatePlacementMember" xlink:label="loc_us-gaap_PrivatePlacementMember_268" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_264" xlink:to="loc_us-gaap_PrivatePlacementMember_268" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_261" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_258" xlink:to="loc_us-gaap_StatementClassOfStockAxis_261" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_262" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_261" xlink:to="loc_us-gaap_ClassOfStockDomain_262" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_262_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_261" xlink:to="loc_us-gaap_ClassOfStockDomain_262_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_267" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_262" xlink:to="loc_us-gaap_CommonClassAMember_267" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_259" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_258" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_259" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_260" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_259" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_260" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_260_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_259" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_260_default" use="optional" order="15" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/RelatedPartyTransactionsAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_285" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfRelatedPartyDebt" xlink:label="loc_us-gaap_RepaymentsOfRelatedPartyDebt_308" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_RepaymentsOfRelatedPartyDebt_308" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_296" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_296" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueIssuedForServices_295" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueIssuedForServices_295" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_WaitingPeriodAfterWhichTheShareTradingDaysAreConsidered" xlink:label="loc_prok_WaitingPeriodAfterWhichTheShareTradingDaysAreConsidered_305" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_prok_WaitingPeriodAfterWhichTheShareTradingDaysAreConsidered_305" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_274" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_274" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_281" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_274" xlink:to="loc_us-gaap_StatementClassOfStockAxis_281" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_282" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_281" xlink:to="loc_us-gaap_ClassOfStockDomain_282" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_282_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_281" xlink:to="loc_us-gaap_ClassOfStockDomain_282_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_292" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_282" xlink:to="loc_us-gaap_CommonClassBMember_292" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_1062027" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_274" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_1062027" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_1062028" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1062027" xlink:to="loc_us-gaap_EquityComponentDomain_1062028" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_1062028_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1062027" xlink:to="loc_us-gaap_EquityComponentDomain_1062028_default" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_FounderSharesMember" xlink:label="loc_prok_FounderSharesMember_1062029" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1062028" xlink:to="loc_prok_FounderSharesMember_1062029" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_BasisAxis" xlink:label="loc_prok_BasisAxis_277" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_274" xlink:to="loc_prok_BasisAxis_277" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_BasisDomain" xlink:label="loc_prok_BasisDomain_278" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_prok_BasisAxis_277" xlink:to="loc_prok_BasisDomain_278" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_BasisDomain" xlink:label="loc_prok_BasisDomain_278_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_prok_BasisAxis_277" xlink:to="loc_prok_BasisDomain_278_default" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_RestrictionOnTransferOfSponsorSharesMember" xlink:label="loc_prok_RestrictionOnTransferOfSponsorSharesMember_287" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_BasisDomain_278" xlink:to="loc_prok_RestrictionOnTransferOfSponsorSharesMember_287" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_275" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_274" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_275" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_276" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_275" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_276" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_276_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_275" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_276_default" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_283" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_274" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_283" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_284" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_283" xlink:to="loc_us-gaap_RelatedPartyDomain_284" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_284_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_283" xlink:to="loc_us-gaap_RelatedPartyDomain_284_default" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_FounderMember" xlink:label="loc_prok_FounderMember_293" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_284" xlink:to="loc_prok_FounderMember_293" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_SponsorMember" xlink:label="loc_prok_SponsorMember_294" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_284" xlink:to="loc_prok_SponsorMember_294" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_279" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_274" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_279" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_280" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_279" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_280" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_280_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_279" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_280_default" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AdministrationAndSupportServicesMember" xlink:label="loc_prok_AdministrationAndSupportServicesMember_288" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_280" xlink:to="loc_prok_AdministrationAndSupportServicesMember_288" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AdvanceFromRelatedPartyLoanMember" xlink:label="loc_prok_AdvanceFromRelatedPartyLoanMember_289" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_280" xlink:to="loc_prok_AdvanceFromRelatedPartyLoanMember_289" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_PromissoryNoteMember" xlink:label="loc_prok_PromissoryNoteMember_290" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_280" xlink:to="loc_prok_PromissoryNoteMember_290" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_PreIpoSponsorPromissoryNoteMember" xlink:label="loc_prok_PreIpoSponsorPromissoryNoteMember_1409940" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_280" xlink:to="loc_prok_PreIpoSponsorPromissoryNoteMember_1409940" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_1167798" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_274" xlink:to="loc_us-gaap_AwardTypeAxis_1167798" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1167800" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_1167798" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1167800" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1167800_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_1167798" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1167800_default" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AgreementAxis" xlink:label="loc_prok_AgreementAxis_1409807" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_274" xlink:to="loc_prok_AgreementAxis_1409807" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AgreementDomain" xlink:label="loc_prok_AgreementDomain_1409808" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_prok_AgreementAxis_1409807" xlink:to="loc_prok_AgreementDomain_1409808" use="optional" order="37" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AgreementDomain" xlink:label="loc_prok_AgreementDomain_1409808_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_prok_AgreementAxis_1409807" xlink:to="loc_prok_AgreementDomain_1409808_default" use="optional" order="38" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualAxis" xlink:label="loc_srt_TitleOfIndividualAxis_1062030" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_274" xlink:to="loc_srt_TitleOfIndividualAxis_1062030" use="optional" order="39" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_1062031" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_1062030" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_1062031" use="optional" order="40" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_1062031_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_1062030" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_1062031_default" use="optional" order="41" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_DirectorMember" xlink:label="loc_srt_DirectorMember_1317425" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_1062031" xlink:to="loc_srt_DirectorMember_1317425" use="optional" order="42" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_IndependentDirectorsMember" xlink:label="loc_prok_IndependentDirectorsMember_1062032" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_1062031" xlink:to="loc_prok_IndependentDirectorsMember_1062032" use="optional" order="43" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty" xlink:label="loc_us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty_1154756" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty_1154756" use="optional" order="44" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_298" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_298" use="optional" order="45" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_NumberOfConsecutiveTradingDaysForDeterminingTheSharePrice" xlink:label="loc_prok_NumberOfConsecutiveTradingDaysForDeterminingTheSharePrice_304" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_prok_NumberOfConsecutiveTradingDaysForDeterminingTheSharePrice_304" use="optional" order="46" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_SharesNoLongerSubjectToForfeiture" xlink:label="loc_prok_SharesNoLongerSubjectToForfeiture_1154722" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_prok_SharesNoLongerSubjectToForfeiture_1154722" use="optional" order="47" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_297" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_297" use="optional" order="48" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockOtherSharesOutstanding" xlink:label="loc_us-gaap_CommonStockOtherSharesOutstanding_299" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_CommonStockOtherSharesOutstanding_299" use="optional" order="49" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent" xlink:label="loc_us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent_310" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent_310" use="optional" order="50" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_WorkingCapitalLoansConvertibleIntoEquityWarrants" xlink:label="loc_prok_WorkingCapitalLoansConvertibleIntoEquityWarrants_311" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_prok_WorkingCapitalLoansConvertibleIntoEquityWarrants_311" use="optional" order="51" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedInPeriodFairValue" xlink:label="loc_prok_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedInPeriodFairValue_1317434" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_prok_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedInPeriodFairValue_1317434" use="optional" order="52" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_1154727" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_1154727" use="optional" order="53" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AdvancesPayableToRelatedPartyCurrent" xlink:label="loc_prok_AdvancesPayableToRelatedPartyCurrent_1154810" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_prok_AdvancesPayableToRelatedPartyCurrent_1154810" use="optional" order="54" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_306" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_306" use="optional" order="55" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_309" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_309" use="optional" order="56" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_NumberOfTradingDaysForDeterminingTheSharePrice" xlink:label="loc_prok_NumberOfTradingDaysForDeterminingTheSharePrice_303" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_prok_NumberOfTradingDaysForDeterminingTheSharePrice_303" use="optional" order="57" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromRelatedPartyDebt" xlink:label="loc_us-gaap_ProceedsFromRelatedPartyDebt_1570113" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_ProceedsFromRelatedPartyDebt_1570113" use="optional" order="58" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DueToRelatedPartiesCurrentAndNoncurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_307" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_307" use="optional" order="59" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_1318969" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_1318969" use="optional" order="60" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaap_SharePrice_302" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_285" xlink:to="loc_us-gaap_SharePrice_302" use="optional" order="61" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/CommitmentsAndContingenciesAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_1167823" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts_1570118" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_1167823" xlink:to="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts_1570118" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_DeferredUnderwritingFees" xlink:label="loc_prok_DeferredUnderwritingFees_316" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_1167823" xlink:to="loc_prok_DeferredUnderwritingFees_316" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_1167829" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_1167823" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_1167829" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_1167806" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_1167823" xlink:to="loc_us-gaap_LossContingenciesTable_1167806" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_1167814" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_1167806" xlink:to="loc_us-gaap_AwardTypeAxis_1167814" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1167815" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_1167814" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1167815" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1167815_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_1167814" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1167815_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_1167817" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1167815" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_1167817" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AgreementAxis" xlink:label="loc_prok_AgreementAxis_1167809" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_1167806" xlink:to="loc_prok_AgreementAxis_1167809" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AgreementDomain" xlink:label="loc_prok_AgreementDomain_1167810" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_prok_AgreementAxis_1167809" xlink:to="loc_prok_AgreementDomain_1167810" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_AgreementDomain" xlink:label="loc_prok_AgreementDomain_1167810_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_prok_AgreementAxis_1167809" xlink:to="loc_prok_AgreementDomain_1167810_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_DirectorRestrictedStockUnitAwardAgreementMember" xlink:label="loc_prok_DirectorRestrictedStockUnitAwardAgreementMember_1167812" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_prok_AgreementDomain_1167810" xlink:to="loc_prok_DirectorRestrictedStockUnitAwardAgreementMember_1167812" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1167818" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_1167806" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1167818" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_1167819" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1167818" xlink:to="loc_us-gaap_ClassOfStockDomain_1167819" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_1167819_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1167818" xlink:to="loc_us-gaap_ClassOfStockDomain_1167819_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_1167820" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_1167819" xlink:to="loc_us-gaap_CommonClassAMember_1167820" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_NumberOfSharesOfCommonStockCommittedToSettleOnADateFollowingTheYearBusinessCombinationOccurs" xlink:label="loc_prok_NumberOfSharesOfCommonStockCommittedToSettleOnADateFollowingTheYearBusinessCombinationOccurs_1167830" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_1167823" xlink:to="loc_prok_NumberOfSharesOfCommonStockCommittedToSettleOnADateFollowingTheYearBusinessCombinationOccurs_1167830" use="optional" order="17" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/TemporaryEquityAndPermanentDeficitAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_322" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_PercentOfFoundersSharesToCompanysIssuedAndOutstandingOrdinaryShares" xlink:label="loc_prok_PercentOfFoundersSharesToCompanysIssuedAndOutstandingOrdinaryShares_334" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_322" xlink:to="loc_prok_PercentOfFoundersSharesToCompanysIssuedAndOutstandingOrdinaryShares_334" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_331" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_322" xlink:to="loc_us-gaap_CommonStockSharesIssued_331" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_330" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_322" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_330" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_332" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_322" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_332" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_325" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_322" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_325" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_326" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_322" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_326" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockOtherSharesOutstanding" xlink:label="loc_us-gaap_CommonStockOtherSharesOutstanding_333" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_322" xlink:to="loc_us-gaap_CommonStockOtherSharesOutstanding_333" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_329" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_322" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_329" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_327" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_322" xlink:to="loc_us-gaap_PreferredStockSharesIssued_327" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_328" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_322" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_328" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfStockByClassTable" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_319" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_322" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_319" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_320" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_319" xlink:to="loc_us-gaap_StatementClassOfStockAxis_320" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_321" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_320" xlink:to="loc_us-gaap_ClassOfStockDomain_321" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_321_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_320" xlink:to="loc_us-gaap_ClassOfStockDomain_321_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_323" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_321" xlink:to="loc_us-gaap_CommonClassAMember_323" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_324" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_321" xlink:to="loc_us-gaap_CommonClassBMember_324" use="optional" order="16" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.businesswire.com/role/FairValueMeasurementsSummaryOfAssetsThatAreMeasuredAtFairValueOnARecurringBasisDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresLineItems" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_1154438" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_1154436" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_1154438" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_1154436" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="prok-20220630.xsd#prok_MarketableSecuritiesHeldToMaturityFairValueDisclosure" xlink:label="loc_prok_MarketableSecuritiesHeldToMaturityFairValueDisclosure_1154439" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_1154436" xlink:to="loc_prok_MarketableSecuritiesHeldToMaturityFairValueDisclosure_1154439" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresTable" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_1154437" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_1154438" xlink:to="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_1154437" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1154440" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_1154437" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1154440" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1154441" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1154440" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1154441" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1154441_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1154440" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1154441_default" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_1154442" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1154441" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_1154442" use="optional" order="7" />
</definitionLink>
</linkbase>
