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Database: UniProt
Entry: CY550_PROMM
LinkDB: CY550_PROMM
Original site: CY550_PROMM 
ID   CY550_PROMM             Reviewed;         170 AA.
AC   Q7V5W0;
DT   24-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2003, sequence version 1.
DT   05-FEB-2025, entry version 113.
DE   RecName: Full=Photosystem II extrinsic protein V {ECO:0000255|HAMAP-Rule:MF_01378};
DE            Short=PsbV {ECO:0000255|HAMAP-Rule:MF_01378};
DE   AltName: Full=Cytochrome c-550 {ECO:0000255|HAMAP-Rule:MF_01378};
DE   AltName: Full=Cytochrome c550 {ECO:0000255|HAMAP-Rule:MF_01378};
DE   AltName: Full=Low-potential cytochrome c {ECO:0000255|HAMAP-Rule:MF_01378};
DE   Flags: Precursor;
GN   Name=psbV {ECO:0000255|HAMAP-Rule:MF_01378}; OrderedLocusNames=PMT_1427;
OS   Prochlorococcus marinus (strain MIT 9313).
OC   Bacteria; Bacillati; Cyanobacteriota; Cyanophyceae; Synechococcales;
OC   Prochlorococcaceae; Prochlorococcus.
OX   NCBI_TaxID=74547;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=MIT 9313;
RX   PubMed=12917642; DOI=10.1038/nature01947;
RA   Rocap G., Larimer F.W., Lamerdin J.E., Malfatti S., Chain P., Ahlgren N.A.,
RA   Arellano A., Coleman M., Hauser L., Hess W.R., Johnson Z.I., Land M.L.,
RA   Lindell D., Post A.F., Regala W., Shah M., Shaw S.L., Steglich C.,
RA   Sullivan M.B., Ting C.S., Tolonen A., Webb E.A., Zinser E.R.,
RA   Chisholm S.W.;
RT   "Genome divergence in two Prochlorococcus ecotypes reflects oceanic niche
RT   differentiation.";
RL   Nature 424:1042-1047(2003).
CC   -!- FUNCTION: One of the extrinsic, lumenal subunits of photosystem II
CC       (PSII). PSII is a light-driven water plastoquinone oxidoreductase,
CC       using light energy to abstract electrons from H(2)O, generating a
CC       proton gradient subsequently used for ATP formation. The extrinsic
CC       proteins stabilize the structure of photosystem II oxygen-evolving
CC       complex (OEC), the ion environment of oxygen evolution and protect the
CC       OEC against heat-induced inactivation. Low-potential cytochrome c that
CC       plays a role in the OEC of PSII. {ECO:0000255|HAMAP-Rule:MF_01378}.
CC   -!- COFACTOR:
CC       Name=heme c; Xref=ChEBI:CHEBI:61717;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01378};
CC       Note=Binds 1 heme c group covalently per subunit. {ECO:0000255|HAMAP-
CC       Rule:MF_01378};
CC   -!- SUBUNIT: PSII is composed of 1 copy each of membrane proteins PsbA,
CC       PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT,
CC       PsbX, PsbY, Psb30/Ycf12, peripheral proteins PsbO, CyanoQ (PsbQ), PsbU,
CC       PsbV and a large number of cofactors. It forms dimeric complexes.
CC       {ECO:0000305}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_01378}; Peripheral membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_01378}; Lumenal side {ECO:0000255|HAMAP-Rule:MF_01378}.
CC       Note=Associated with photosystem II at the lumenal side of the
CC       thylakoid membrane. {ECO:0000255|HAMAP-Rule:MF_01378}.
CC   -!- SIMILARITY: Belongs to the cytochrome c family. PsbV subfamily.
CC       {ECO:0000255|HAMAP-Rule:MF_01378}.
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DR   EMBL; BX548175; CAE21602.1; -; Genomic_DNA.
DR   AlphaFoldDB; Q7V5W0; -.
DR   SMR; Q7V5W0; -.
DR   KEGG; pmt:PMT_1427; -.
DR   eggNOG; COG2010; Bacteria.
DR   HOGENOM; CLU_104149_1_0_3; -.
DR   OrthoDB; 486949at2; -.
DR   Proteomes; UP000001423; Chromosome.
DR   GO; GO:0009523; C:photosystem II; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0009055; F:electron transfer activity; IEA:InterPro.
DR   GO; GO:0020037; F:heme binding; IEA:InterPro.
DR   GO; GO:0005506; F:iron ion binding; IEA:InterPro.
DR   GO; GO:0019684; P:photosynthesis, light reaction; IEA:UniProtKB-UniRule.
DR   GO; GO:0022904; P:respiratory electron transport chain; IEA:InterPro.
DR   Gene3D; 1.10.760.10; Cytochrome c-like domain; 1.
DR   HAMAP; MF_01378; PSII_Cyt550; 1.
DR   InterPro; IPR009056; Cyt_c-like_dom.
DR   InterPro; IPR036909; Cyt_c-like_dom_sf.
DR   InterPro; IPR029490; Cytochrom_C550.
DR   InterPro; IPR017851; PsbV_cyt_c550.
DR   InterPro; IPR016003; PsbV_cyt_c550-like.
DR   NCBIfam; TIGR03045; PS_II_C550; 1.
DR   Pfam; PF14495; Cytochrom_C550; 1.
DR   PIRSF; PIRSF005890; Phot_II_cyt_c550; 1.
DR   SUPFAM; SSF46626; Cytochrome c; 1.
DR   PROSITE; PS51007; CYTC; 1.
PE   3: Inferred from homology;
KW   Electron transport; Heme; Iron; Membrane; Metal-binding; Photosynthesis;
KW   Photosystem II; Reference proteome; Signal; Thylakoid; Transport.
FT   SIGNAL          1..33
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01378"
FT   CHAIN           34..170
FT                   /note="Photosystem II extrinsic protein V"
FT                   /id="PRO_5000096803"
FT   BINDING         70
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01378"
FT   BINDING         73
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01378"
FT   BINDING         74
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01378"
FT   BINDING         125
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01378"
SQ   SEQUENCE   170 AA;  18174 MW;  0F1C1260905C6E0C CRC64;
     MASLFASLGR SLIKLLIVLP VIIGLSISSP AMAAQWDAET LTVPAGSGGQ QVTFTESEIK
     SASKLFKSNC ATCHNQGVTK TNQNVGLDLE ALSLASPARD NVDGLVEFLK NPMSYDGEYS
     IADTHPGISS SDVYVQMRTL NDEDLRLIAG YILTAEKVQG DQWGGGKIYF
//
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