ID   CYC6_NOSSO              Reviewed;         111 AA.
AC   P0A3X8; P28596;
DT   15-MAR-2005, integrated into UniProtKB/Swiss-Prot.
DT   15-MAR-2005, sequence version 1.
DT   03-AUG-2022, entry version 66.
DE   RecName: Full=Cytochrome c6;
DE   AltName: Full=Cytochrome c-553;
DE   AltName: Full=Cytochrome c553;
DE   AltName: Full=Soluble cytochrome f;
DE   Flags: Precursor;
GN   Name=petJ; Synonyms=cytA;
OS   Nostoc sp. (strain ATCC 29151 / PCC 7119) (Anabaena sp.).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Nostoc.
OX   NCBI_TaxID=1168;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=9473522; DOI=10.1006/bbrc.1997.7953;
RA   Molina-Heredia F.P., Hervas M., Navarro J.A., De la Rosa M.A.;
RT   "Cloning and correct expression in Escherichia coli of the petE and petJ
RT   genes respectively encoding plastocyanin and cytochrome c6 from the
RT   cyanobacterium Anabaena sp. PCC 7119.";
RL   Biochem. Biophys. Res. Commun. 243:302-306(1998).
CC   -!- FUNCTION: Functions as an electron carrier between membrane-bound
CC       cytochrome b6-f and photosystem I in oxygenic photosynthesis.
CC       {ECO:0000250}.
CC   -!- SUBUNIT: Monomer. {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid lumen {ECO:0000305}.
CC   -!- PTM: Binds 1 heme c group covalently per subunit. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the cytochrome c family. PetJ subfamily.
CC       {ECO:0000305}.
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DR   EMBL; AJ002361; CAA05337.1; -; Genomic_DNA.
DR   PIR; I39601; I39601.
DR   AlphaFoldDB; P0A3X8; -.
DR   SMR; P0A3X8; -.
DR   IntAct; P0A3X8; 1.
DR   MINT; P0A3X8; -.
DR   GO; GO:0031979; C:plasma membrane-derived thylakoid lumen; 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; 1.10.760.10; -; 1.
DR   HAMAP; MF_00594; Cytc_PetJ; 1.
DR   InterPro; IPR009056; Cyt_c-like_dom.
DR   InterPro; IPR036909; Cyt_c-like_dom_sf.
DR   InterPro; IPR023655; Cyt_C6.
DR   InterPro; IPR008168; Cyt_C_IC.
DR   PANTHER; PTHR34688; PTHR34688; 1.
DR   Pfam; PF13442; Cytochrome_CBB3; 1.
DR   PRINTS; PR00605; CYTCHROMECIC.
DR   SUPFAM; SSF46626; SSF46626; 1.
DR   PROSITE; PS51007; CYTC; 1.
PE   3: Inferred from homology;
KW   Electron transport; Heme; Iron; Metal-binding; Photosynthesis; Signal;
KW   Thylakoid; Transport.
FT   SIGNAL          1..25
FT                   /evidence="ECO:0000250"
FT   CHAIN           26..111
FT                   /note="Cytochrome c6"
FT                   /id="PRO_0000023854"
FT   BINDING         39
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /note="covalent"
FT                   /evidence="ECO:0000250"
FT   BINDING         42
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /note="covalent"
FT                   /evidence="ECO:0000250"
FT   BINDING         43
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:0000250"
FT   BINDING         83
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:0000250"
SQ   SEQUENCE   111 AA;  11799 MW;  A82778FBFE87AE80 CRC64;
     MKKIFSLVLL GIALFTFAFS SPALAADSVN GAKIFSANCA SCHAGGKNLV QAQKTLKKAD
     LEKYGMYSAE AIIAQVTNGK NAMPAFKGRL KPEQIEDVAA YVLGKADADW K