A2C057PSBA_PROM1Photosystem II protein D1PSII D1 protein1.10.3.9Photosystem II Q(B) proteinpsbA1NATL1_03031psbA2NATL1_13251psbA3NATL1_15721Prochlorococcus marinus (strain NATL1A)BacteriaCyanobacteriotaCyanophyceaeSynechococcalesProchlorococcaceaeProchlorococcusPatterns and implications of gene gain and loss in the evolution of Prochlorococcus.NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]Photosystem II (PSII) is a light-driven water:plastoquinone oxidoreductase that uses light energy to abstract electrons from H(2)O, generating O(2) and a proton gradient subsequently used for ATP formation. It consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. The D1/D2 (PsbA/PsbD) reaction center heterodimer binds P680, the primary electron donor of PSII as well as several subsequent electron acceptors.2 a plastoquinone + 2 H2O + 4 hnu = 2 a plastoquinol + O2The D1/D2 heterodimer binds P680, chlorophylls that are the primary electron donor of PSII, and subsequent electron acceptors. It shares a non-heme iron and each subunit binds pheophytin, quinone, additional chlorophylls, carotenoids and lipids. D1 provides most of the ligands for the Mn4-Ca-O5 cluster of the oxygen-evolving complex (OEC). There is also a Cl(-1) ion associated with D1 and D2, which is required for oxygen evolution. The PSII complex binds additional chlorophylls, carotenoids and specific lipids.PSII is composed of 1 copy each of membrane proteins PsbA, PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT, PsbX, PsbY, Psb30/Ycf12, peripheral proteins PsbO, CyanoQ (PsbQ), PsbU, PsbV and a large number of cofactors. It forms dimeric complexes.Cellular thylakoid membraneMulti-pass membrane proteinTyr-162 forms a radical intermediate that is referred to as redox-active TyrZ, YZ or Y-Z.C-terminally processed by CtpA; processing is essential to allow assembly of the oxygen-evolving complex and thus photosynthetic growth.Cyanobacteria usually contain more than 2 copies of the psbA gene.2 of the reaction center chlorophylls (ChlD1 and ChlD2) are entirely coordinated by water.Herbicides such as atrazine, BNT, diuron or ioxynil bind in the Q(B) binding site and block subsequent electron transfer.Belongs to the reaction center PufL/M/PsbA/D family.CalciumChlorophyllChromophoreElectron transportHerbicide resistanceIronMagnesiumManganeseMembraneMetal-bindingOxidoreductasePhotosynthesisPhotosystem IIThylakoidTransmembraneTransmembrane helixTransportchlorophyll aMgpheophytin a[CaMn4O5] cluster[CaMn4O5] clusterchlorophyll aMga quinoneFe cationligand shared with heterodimeric partnera quinoneFe cationligand shared with heterodimeric partner[CaMn4O5] cluster[CaMn4O5] cluster[CaMn4O5] cluster[CaMn4O5] clusterMTTIQQQRSSLLKGWPQFCEWVTSTNNRIYVGWFGVLMIPCLLAATTCFIVAFIAAPPVDIDGIREPVAGSFMYGNNIISGAVVPSSNAIGLHFYPIWEAATLDEWLYNGGPYQLVIFHFLIGISAYMGRQWELSYRLGMRPWICVAYSAPVSAAFAVFLVYPFGQGSFSDGMPLGISGTFNFMFVFQAEHNILMHPFHMAGVAGMFGGALFSAMHGSLVTSSLIRETTGLDSQNYGYKFGQEEETYNIVAAHGYFGRLIFQYASFNNSRSLHFFLASWPVICVWLTSMGICTMAFNLNGFNFNQSVVDTSGKVVPTWGDVLNRANLGMEVMHERNAHNFPLDLAAAESTSVALVAPAIG
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