ID   CYF_NOSP7               Reviewed;         333 AA.
AC   B2J3K1;
DT   14-APR-2009, integrated into UniProtKB/Swiss-Prot.
DT   10-JUN-2008, sequence version 1.
DT   03-AUG-2022, entry version 69.
DE   RecName: Full=Cytochrome f {ECO:0000255|HAMAP-Rule:MF_00610};
DE   Flags: Precursor;
GN   Name=petA {ECO:0000255|HAMAP-Rule:MF_00610}; OrderedLocusNames=Npun_R0131;
OS   Nostoc punctiforme (strain ATCC 29133 / PCC 73102).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Nostoc.
OX   NCBI_TaxID=63737;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 29133 / PCC 73102;
RG   US DOE Joint Genome Institute;
RA   Copeland A., Lucas S., Lapidus A., Glavina del Rio T., Dalin E., Tice H.,
RA   Pitluck S., Chain P., Malfatti S., Shin M., Vergez L., Schmutz J.,
RA   Larimer F., Land M., Hauser L., Kyrpides N., Kim E., Meeks J.C., Elhai J.,
RA   Campbell E.L., Thiel T., Longmire J., Potts M., Atlas R.;
RT   "Complete sequence of chromosome of Nostoc punctiforme ATCC 29133.";
RL   Submitted (APR-2008) to the EMBL/GenBank/DDBJ databases.
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:0000255|HAMAP-Rule:MF_00610}.
CC   -!- COFACTOR:
CC       Name=heme; Xref=ChEBI:CHEBI:30413;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00610};
CC       Note=Binds 1 heme group covalently. {ECO:0000255|HAMAP-Rule:MF_00610};
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_00610}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_00610}; Multi-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_00610}.
CC   -!- SIMILARITY: Belongs to the cytochrome f family. {ECO:0000255|HAMAP-
CC       Rule:MF_00610}.
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DR   EMBL; CP001037; ACC78931.1; -; Genomic_DNA.
DR   RefSeq; WP_012406960.1; NC_010628.1.
DR   AlphaFoldDB; B2J3K1; -.
DR   SMR; B2J3K1; -.
DR   STRING; 63737.Npun_R0131; -.
DR   EnsemblBacteria; ACC78931; ACC78931; Npun_R0131.
DR   KEGG; npu:Npun_R0131; -.
DR   eggNOG; COG3258; Bacteria.
DR   HOGENOM; CLU_033498_0_0_3; -.
DR   OMA; FWAQQNY; -.
DR   OrthoDB; 744890at2; -.
DR   PhylomeDB; B2J3K1; -.
DR   Proteomes; UP000001191; Chromosome.
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   Reference proteome; Signal; Thylakoid; Transmembrane; Transmembrane helix;
KW   Transport.
FT   SIGNAL          1..16
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00610"
FT   CHAIN           17..333
FT                   /note="Cytochrome f"
FT                   /id="PRO_1000130350"
FT   TRANSMEM        17..36
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00610"
FT   TRANSMEM        299..319
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00610"
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:0000255|HAMAP-Rule:MF_00610"
FT   BINDING         66
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00610"
FT   BINDING         69
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00610"
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:0000255|HAMAP-Rule:MF_00610"
SQ   SEQUENCE   333 AA;  36078 MW;  D29D056EBB2903D6 CRC64;
     MRNVFRTARL TRSARAIVKT LLIAIATVTF YFTSDLALPQ SAAAYPFWAQ QTYPETPREP
     TGRIVCANCH LAAKVTEVEV PQSVLPDTVF KAIVKIPYDL SAQQVGADGS KVGLNVGAVL
     MLPEGFKIAP EDRISEELKE EIGDTAFQPY SEDKENVVIV GPLPGEQYQE IIFPVLSPNP
     ATDKNIHFGK YSVHVGGNRG RGQVYPTGEK SNNSVYNASA TGTITKIAKE EDADGNVKYL
     VNIQPESGDV VVDTVPLGPD LIVSEGQAVK TGDALTNNPN VGGFGQIDAE IVLQDSSRVK
     WMIAFVALVM LAQVMLVLKK KQVEKVQAAE MNF