ID   CYF_DESSP               Reviewed;         333 AA.
AC   P13626;
DT   01-JAN-1990, integrated into UniProtKB/Swiss-Prot.
DT   01-JAN-1990, sequence version 1.
DT   03-AUG-2022, entry version 102.
DE   RecName: Full=Cytochrome f;
DE   Flags: Precursor;
GN   Name=petA;
OS   Desmonostoc sp. (strain PCC 7906) (Nostoc sp. (strain PCC 7906)).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Desmonostoc.
OX   NCBI_TaxID=1181;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=2842748; DOI=10.1073/pnas.85.16.5794;
RA   Kallas T., Spiller S., Malkin R.;
RT   "Primary structure of cotranscribed genes encoding the Rieske Fe-S and
RT   cytochrome f proteins of the cyanobacterium Nostoc PCC 7906.";
RL   Proc. Natl. Acad. Sci. U.S.A. 85:5794-5798(1988).
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.
CC       {ECO:0000250}.
CC   -!- COFACTOR:
CC       Name=heme; Xref=ChEBI:CHEBI:30413; Evidence={ECO:0000250};
CC       Note=Binds 1 heme group covalently. {ECO:0000250};
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 (By similarity). {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000250};
CC       Single-pass membrane protein {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the cytochrome f family. {ECO:0000305}.
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DR   EMBL; J03855; AAA23333.1; -; Genomic_DNA.
DR   AlphaFoldDB; P13626; -.
DR   SMR; P13626; -.
DR   GO; GO:0031361; C:integral component of thylakoid membrane; IEA:InterPro.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0009055; F:electron transfer activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0020037; F:heme binding; IEA:InterPro.
DR   GO; GO:0005506; F:iron ion binding; IEA:InterPro.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-UniRule.
DR   Gene3D; 2.60.40.830; -; 1.
DR   HAMAP; MF_00610; Cytb6_f_cytF; 1.
DR   InterPro; IPR024058; Cyt-f_TM.
DR   InterPro; IPR002325; Cyt_f.
DR   InterPro; IPR024094; Cyt_f_lg_dom.
DR   InterPro; IPR036826; Cyt_f_lg_dom_sf.
DR   InterPro; IPR011054; Rudment_hybrid_motif.
DR   Pfam; PF01333; Apocytochr_F_C; 1.
DR   Pfam; PF16639; Apocytochr_F_N; 1.
DR   PRINTS; PR00610; CYTOCHROMEF.
DR   SUPFAM; SSF103431; SSF103431; 1.
DR   SUPFAM; SSF49441; SSF49441; 1.
DR   SUPFAM; SSF51246; SSF51246; 1.
DR   PROSITE; PS51010; CYTF; 1.
PE   3: Inferred from homology;
KW   Electron transport; Heme; Iron; Membrane; Metal-binding; Photosynthesis;
KW   Signal; Thylakoid; Transmembrane; Transmembrane helix; Transport.
FT   SIGNAL          1..44
FT   CHAIN           45..333
FT                   /note="Cytochrome f"
FT                   /id="PRO_0000023844"
FT   TRANSMEM        301..318
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   BINDING         45
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000250"
FT   BINDING         66
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /note="covalent"
FT                   /evidence="ECO:0000250"
FT   BINDING         69
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /note="covalent"
FT                   /evidence="ECO:0000250"
FT   BINDING         70
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   333 AA;  35931 MW;  683F4A74AF557F77 CRC64;
     MRNASVTARL TRSVRAIVKT LLIAIATVTF YFSCDLALPQ SAAAYPFWAQ QTYPETPREP
     TGRIVCANCH LAAKPTEVEV PQSVLPDTVF KAVVKIPYDT SAQQVGADGS KVGLNVGAVL
     MLPEGFKIAP EDRISEELQE EIGDTYFQPY SEDKENIVIV GPLPGEQYQE IVFPVLSPNP
     ATDKNIHFGK YSVHVGGNRG RGQVYPTGEK SNNNLYNASA TGTIAKIAKE EDEDGNVKYQ
     VNIQPESGDV VVDTVPAGPE LIVSEGQAVK AGDALTNNPN VGGFGQRDAE IVLQDAGRVK
     GLIAFVALVM LAQVMLVLKK KQVERVQAAE MNF