ID   CYC6_NEOYE              Reviewed;         110 AA.
AC   Q8WKJ8; Q1XDT7;
DT   08-NOV-2002, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-2002, sequence version 1.
DT   03-AUG-2022, entry version 95.
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;
OS   Neopyropia yezoensis (Susabi-nori) (Pyropia yezoensis).
OG   Plastid; Chloroplast.
OC   Eukaryota; Rhodophyta; Bangiophyceae; Bangiales; Bangiaceae; Neopyropia.
OX   NCBI_TaxID=2788;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RA   Oku T.;
RT   "Red alga, Porphyra yezoensis cytochrome c6.";
RL   Submitted (MAR-2000) to the EMBL/GenBank/DDBJ databases.
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=U-51;
RA   Kunimoto M., Morishima K., Yoshikawa M., Fukuda S., Kobayashi T.,
RA   Kobayashi M., Okazaki T., Ohara I., Nakayama I.;
RT   "Whole genome sequence of Porphyra yezoensis chloroplast.";
RL   Submitted (NOV-2003) to the EMBL/GenBank/DDBJ databases.
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: Plastid, chloroplast thylakoid lumen
CC       {ECO:0000250}.
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; AB040818; BAB82501.1; -; mRNA.
DR   EMBL; AP006715; BAE92324.1; -; Genomic_DNA.
DR   RefSeq; YP_536881.1; NC_007932.1.
DR   PDB; 1GDV; X-ray; 1.57 A; A=26-110.
DR   PDBsum; 1GDV; -.
DR   AlphaFoldDB; Q8WKJ8; -.
DR   SMR; Q8WKJ8; -.
DR   GeneID; 3978943; -.
DR   EvolutionaryTrace; Q8WKJ8; -.
DR   GO; GO:0009543; C:chloroplast 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   1: Evidence at protein level;
KW   3D-structure; Chloroplast; Electron transport; Heme; Iron; Metal-binding;
KW   Photosynthesis; Plastid; Signal; Thylakoid; Transport.
FT   SIGNAL          1..25
FT                   /evidence="ECO:0000250"
FT   CHAIN           26..110
FT                   /note="Cytochrome c6"
FT                   /id="PRO_0000023853"
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"
FT   HELIX           27..38
FT                   /evidence="ECO:0007829|PDB:1GDV"
FT   HELIX           40..43
FT                   /evidence="ECO:0007829|PDB:1GDV"
FT   HELIX           44..46
FT                   /evidence="ECO:0007829|PDB:1GDV"
FT   STRAND          49..51
FT                   /evidence="ECO:0007829|PDB:1GDV"
FT   HELIX           58..63
FT                   /evidence="ECO:0007829|PDB:1GDV"
FT   HELIX           69..78
FT                   /evidence="ECO:0007829|PDB:1GDV"
FT   TURN            87..89
FT                   /evidence="ECO:0007829|PDB:1GDV"
FT   HELIX           92..108
FT                   /evidence="ECO:0007829|PDB:1GDV"
SQ   SEQUENCE   110 AA;  11900 MW;  C867A9CB876E012F CRC64;
     MKKKLSVLFT VFSFFVIGFA QIAFAADLDN GEKVFSANCA ACHAGGNNAI MPDKTLKKDV
     LEANSMNTID AITYQVQNGK NAMPAFGGRL VDEDIEDAAN YVLSQSEKGW