ID   PETG_PROM4              Reviewed;          39 AA.
AC   A9BB51;
DT   14-APR-2009, integrated into UniProtKB/Swiss-Prot.
DT   15-JAN-2008, sequence version 1.
DT   25-MAY-2022, entry version 71.
DE   RecName: Full=Cytochrome b6-f complex subunit 5 {ECO:0000255|HAMAP-Rule:MF_00432};
DE   AltName: Full=Cytochrome b6-f complex subunit PetG {ECO:0000255|HAMAP-Rule:MF_00432};
DE   AltName: Full=Cytochrome b6-f complex subunit V {ECO:0000255|HAMAP-Rule:MF_00432};
GN   Name=petG {ECO:0000255|HAMAP-Rule:MF_00432}; OrderedLocusNames=P9211_11321;
OS   Prochlorococcus marinus (strain MIT 9211).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Prochlorococcus.
OX   NCBI_TaxID=93059;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=MIT 9211;
RX   PubMed=18159947; DOI=10.1371/journal.pgen.0030231;
RA   Kettler G.C., Martiny A.C., Huang K., Zucker J., Coleman M.L., Rodrigue S.,
RA   Chen F., Lapidus A., Ferriera S., Johnson J., Steglich C., Church G.M.,
RA   Richardson P., Chisholm S.W.;
RT   "Patterns and implications of gene gain and loss in the evolution of
RT   Prochlorococcus.";
RL   PLoS Genet. 3:2515-2528(2007).
CC   -!- FUNCTION: Component of the cytochrome b6-f complex, which mediates
CC       electron transfer between photosystem II (PSII) and photosystem I
CC       (PSI), cyclic electron flow around PSI, and state transitions. PetG is
CC       required for either the stability or assembly of the cytochrome b6-f
CC       complex. {ECO:0000255|HAMAP-Rule:MF_00432}.
CC   -!- SUBUNIT: The 4 large subunits of the cytochrome b6-f complex are
CC       cytochrome b6, subunit IV (17 kDa polypeptide, PetD), cytochrome f and
CC       the Rieske protein, while the 4 small subunits are PetG, PetL, PetM and
CC       PetN. The complex functions as a dimer. {ECO:0000255|HAMAP-
CC       Rule:MF_00432}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_00432}; Single-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_00432}.
CC   -!- SIMILARITY: Belongs to the PetG family. {ECO:0000255|HAMAP-
CC       Rule:MF_00432}.
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DR   EMBL; CP000878; ABX09063.1; -; Genomic_DNA.
DR   AlphaFoldDB; A9BB51; -.
DR   SMR; A9BB51; -.
DR   STRING; 93059.P9211_11321; -.
DR   EnsemblBacteria; ABX09063; ABX09063; P9211_11321.
DR   KEGG; pmj:P9211_11321; -.
DR   HOGENOM; CLU_216962_0_0_3; -.
DR   Proteomes; UP000000788; Chromosome.
DR   GO; GO:0009512; C:cytochrome b6f complex; IEA:InterPro.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0045158; F:electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0017004; P:cytochrome complex assembly; IEA:UniProtKB-UniRule.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   HAMAP; MF_00432; Cytb6_f_PetG; 1.
DR   InterPro; IPR003683; Cyt_6/f_cplx_su5.
DR   InterPro; IPR036099; Cyt_6/f_cplx_su5_sf.
DR   Pfam; PF02529; PetG; 1.
DR   PIRSF; PIRSF000034; Cyt_b6-f_V; 1.
DR   SUPFAM; SSF103446; SSF103446; 1.
PE   3: Inferred from homology;
KW   Electron transport; Membrane; Photosynthesis; Reference proteome;
KW   Thylakoid; Transmembrane; Transmembrane helix; Transport.
FT   CHAIN           1..39
FT                   /note="Cytochrome b6-f complex subunit 5"
FT                   /id="PRO_1000192785"
FT   TRANSMEM        5..25
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00432"
SQ   SEQUENCE   39 AA;  4418 MW;  4C294B8765F1E31C CRC64;
     MIEPLLCGIV LGLVPITIVG LFVSAWNQYR RESAMPDWE