Structural sub-assembly of injectisomeSubunit function/roleCommon nameEPECaccPaeruginosaYersiniaShigella_flexneriSalmonellaSP1SalmonellaSPI2Chlamydia_pneumoniaeBordetellaPsyringaeRsolanacearumXanthomonasBpseudomalleiFlagellum
TranslocatorsTranslocon pore proteinSctE1EspDB7UM93 PopB15YopBIpaBSipBSseCCopB1/26, 7BopB12HrpK14PopF1/PopF2HrpK14BipB13
TranslocatorsTranslocon pore proteinSctB1EspBQ05129 PopD15YopDIpaCSipCSseDCopD1/27BopD12XopA14XopA14BipC13
TranslocatorsTip/filament proteinSctA1EspAB7UM94 PcrV15LcrVIpaDSipDSseDCT584 or LcrV6, 7Bsp228BipD13FliC3
NeedleNeedle componentSctF1EscFB7UM90 PscF15YscFMxiHPrgISsaGCdsF6, 7BscF11HrpAHrpYHrpE14BsaL13
OM ringSecretinSctC1EscCB7UMB3PscC15YscCMxiDInvGSsaCCdsC6, 7BscC11HrcC14HrcC14HrcC14BsaO13FlgI/FlgH * 2
PilotinExsB15VirGMxiMInvHBscW11
OM-IM connectorInner rodSctI1EscIB7UMB0 PscI15YscIMxiIPrgJSsaIBscI11HrpBHrpJHrpB214BsaK13FlgB/FlgC/FlgF/FlgG4
Accessory enzymeMuramidaseEtgAB7UMB7 YsaH13IpgF13IagB13IagB13HrpHBapC13
IM ringLipoprotein ring componentSctJ1EscJB7UMB1 PscJ15YscJMxiJPrgKSsaJCdsJ7BscJ11HrcJ14HrcJ14HrcJ14BsaJ13FliF2
IM ringMajor IM ring componentSctD1EscDB7UM96 PscD15YscDMxiGPrgHSsaDCdsD6, 7BscD11HrpQHrcD14 HrpWHrcD14BsaM13FliG5
Export apparatus or TranslocaseTranslocase channelSctR1EscRB7UMC1 PscR15YscRSpa24InvL/SpaPSsaRCdsR7BscR11HrcR14HrcR14HrcR14BsaW13FliP2
Export apparatus or TranslocaseTranslocase channelSctS1EscSB7UMC0PscS15YscSSpa9SpaQSsaSCdsS7BscS11HrcS14HrcS14HrcS14BsaX13FliQ2
Export apparatus or TranslocaseTranslocase channelSctT1EscTB7UMB9 PscT15YscTSpa29InvN/SpaRSsaTCdsT7BscT11HrcT14HrcT14HrcT14BsaY13FliR2
Export apparatus or TranslocaseMinor component, external to channelSctU1EscUB7UMB8 PscU15YscUSpa40SpaSSsaUCdsU7BscU11HrcU14HrcU14HrcU14BsaZ13FlhB2
Export apparatus or TranslocaseMajor component, external to channelSctV1EscVB7UMA7 PcrD15YscV (LcrD) MxiAInvASsaVCdsV7BscV11HrcVHrcVHcrV14BsaQ13FlhA2
ATPase complexExternal stator** connecting ATPase and Cytoplasmic ringSctL1EscLB7UMC2 PscL15YscLMxiNOrgB13SsaKCdsL6, 7BscL11HrcEHrpFHrcL14OrgB13FliH2
ATPase complexHexameric ring-structure ATPaseSctN1EscNB7UMA6 PscN15YscNSpa47InvC/SpaLSsaNCdsN6, 7BscN11HrcN14HrcN14HrcN14BsaS13FliI2
ATPase complexCentral stalk**, inserting in ATPase ringSctO1EscOB7UMA5PscO15YscOSpa13InvISsaOCdsO6, 7HrpOHrpDHrpB714HrpD or BsaU13FliJ5
Cytoplasmic ringComponent of 6 Pod assemblySctQ1SepQB7UMA3PscQ15YscQSpa33SpaOSsaQCdsQ6, 7BscQ11HrcQA+B14HrcQHrcQA+B 14BsaV13FliN/FliM2
Cytoplasmic ringConnector of Pods with SctDSctK1EscKB7UMC3PscK15YscKMxiKOrgA13HrpDOrgA13
GatekeeperGatekeeper/Affinity switchSctW1SepLB7UM95 PopN15YopN +TyeAMxiCInvESsaLCopN6, 7BopN12HrpJHpaA14HpaA14BsaP13
GatekeeperSubunit 1 of SctW chaperone heterodimerSepDB7UMB2 SpiC16
GatekeeperSubunit 2 of SctW chaperone heterodimerCesLB7UMA8
Assembly regulatorsMolecular ruler regulating needle/filament lengthSctP1EscPB7UMA4PscP15YscPSpa32InvJSsaPCdsP7BscK11HrpPHpaPHpaC14BsaU13FliK2
ChaperonesFor early substrates (needle component)EscGB7UM89PscG15YscG15
ChaperonesFor early substratesEscEB7UMC5 PscE15YscE15
ChaperonesFor middle substrates (filament component)CesABB7UMC4 Btc229
ChaperonesFor middle substrates (translocators)CesDB7UMB4 PcrH15SycD15IpgC15SicA17Scc2/Scc310BicA13
ChaperonesFor middle substrates (translocators)CesD2B7UM91
ChaperonesFor late substrates (effectors)CesFB7UMA1
ChaperonesFor late substrates (effectors)CesTP21244 SycE20SigE18
ChaperonesFor late substrates (effectors)YsaK20Spa1520InvB20, 13InvB20, 13
ChaperonesFor flagellar substrate (FlgK)FlgN
ChaperonesFor flagellar substrate (FliC)FliS
ChaperonesFor flagellar substrate (FliD)FliT
Transcription regulatorsGlobal RegulatorLerB7UMC6