Q46IV5PSAB_PROMTPhotosystem I P700 chlorophyll a apoprotein A21.97.1.12PsaBpsaBPMN2A_1083Prochlorococcus marinus (strain NATL2A)BacteriaCyanobacteriotaCyanophyceaeSynechococcalesProchlorococcaceaeProchlorococcusPatterns and implications of gene gain and loss in the evolution of Prochlorococcus.NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]PsaA and PsaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. Oxidized P700 is reduced on the lumenal side of the thylakoid membrane by plastocyanin or cytochrome c6.hnu + oxidized [2Fe-2S]-[ferredoxin] + reduced [plastocyanin] = oxidized [plastocyanin] + reduced [2Fe-2S]-[ferredoxin]PSI electron transfer chain: 5 divinyl chlorophyll a, 1 divinyl chlorophyll a', 2 phylloquinones and 3 4Fe-4S clusters. PSI core antenna: 90 divinyl chlorophyll a, 22 carotenoids, 3 phospholipids and 1 galactolipid. P700 is a divinyl chlorophyll a/divinyl chlorophyll a' dimer, A0 is one or more divinyl chlorophyll a, A1 is one or both phylloquinones and FX is a shared 4Fe-4S iron-sulfur center.The PsaA/B heterodimer binds the P700 divinyl chlorophyll special pair and subsequent electron acceptors. PSI consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. The cyanobacterial PSI reaction center is composed of one copy each of PsaA,B,C,D,E,F,I,J,K,L,M and X, and forms trimeric complexes.Cellular thylakoid membraneMulti-pass membrane proteinBelongs to the PsaA/PsaB family.4Fe-4SChlorophyllChromophoreElectron transportIronIron-sulfurMagnesiumMembraneMetal-bindingOxidoreductasePhotosynthesisPhotosystem IReference proteomeThylakoidTransmembraneTransmembrane helixTransport[4Fe-4S] clusterligand shared between dimeric partners[4Fe-4S] clusterligand shared between dimeric partnersdivinyl chlorophyll aMgdivinyl chlorophyll aMgdivinyl chlorophyll aphylloquinoneMATKFPSFSQGLAQDPTTRRIWYGIATAHDFESHDGMTEEQLYQKLFSTHFGHLAIIGLWVAGNLFHIAWQGNFEQWVLDPLHTRPIAHAIWDPHFGQGLTDALTQAGATSPVNIAYSGLYHWWYTIGMRTNEQLFQGAIFINILVCWLLFAGWLHLQPKYRPSLAWFKNAESQLNHHLAVLFGFSSIAWTGHLIHVAIPESRGIHVGWENWLTVMPHPEGLTPFFSGNWGAYAQNPDSIDAVFGTSQGAGTAIFTFLGGLHPQSESLWLTDIAHHHLAIGVVFIIAGHMYRTNFGIGHSLKEIIEAHNTSHPKDPHRGYFGIKHNGLFETVNNSLHFQLGLALASLGVACSLVAQHMGALPSYAFIARDYTTQSALYTHHQYIAMFLMVGAFSHGAIFFVRDYDPELNKDNVLARILSTKEALISHLSWVTMLLGFHTLGIYVHNDVVVAFGTPEKQILIEPVFAQFAQAASGKMMYGFNALLANASSSASIAANSMPGNHYWMDMINRPDALTNFLPIGPADFLVHHAIALGLHTTALILIKGALDARGTKLIPDKKDLGFAFPCDGPGRGGTCDSSSWDATYLAMFWALNTIAWITFYWHWKHLAIWMGNTAQFNESGTYLMGWFRDYLWLNSSQLINGYNPFGVNALSPWAWMFLFGHLIWATGFMFLISWRGYWQELIETLVWAHQRTPIANLVGWRDKPVALSIVQARLVGLTHFTVGNFVTFGAFVIASTSGKFG
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