ID   CY551_PROVB             Reviewed;         206 AA.
AC   P0C889; P42426;
DT   14-OCT-2008, integrated into UniProtKB/Swiss-Prot.
DT   14-OCT-2008, sequence version 1.
DT   03-AUG-2022, entry version 34.
DE   RecName: Full=Photosynthetic reaction center cytochrome c-551;
DE            Short=Cytochrome c551;
GN   Name=pscC; Synonyms=cycA;
OS   Prosthecochloris vibrioformis (Chlorobium vibrioforme).
OC   Bacteria; Chlorobi; Chlorobia; Chlorobiales; Chlorobiaceae;
OC   Prosthecochloris.
OX   NCBI_TaxID=1098;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=f. thiosulfatophilum / Larsen;
RX   PubMed=9230061; DOI=10.1021/bi9701787;
RA   Oh-oka H., Iwaki M., Itoh S.;
RT   "Viscosity dependence of the electron transfer rate from bound cytochrome c
RT   to P840 in the photosynthetic reaction center of the green sulfur bacterium
RT   Chlorobium tepidum.";
RL   Biochemistry 36:9267-9272(1997).
CC   -!- FUNCTION: Monoheme cytochrome which is the immediate electron donor to
CC       P840 of the photosynthetic reaction center complex.
CC       {ECO:0000250|UniProtKB:B3QM18}.
CC   -!- SUBUNIT: Component of the photosynthetic reaction center. The reaction
CC       center interacts with the Fenna-Matthews-Olson (FMO, fmoA) complex.
CC       {ECO:0000250|UniProtKB:O07091}.
CC   -!- SUBCELLULAR LOCATION: Cell inner membrane
CC       {ECO:0000250|UniProtKB:O07091}; Multi-pass membrane protein
CC       {ECO:0000305}.
CC   -!- PTM: Binds 1 heme group per subunit. {ECO:0000250|UniProtKB:B3QM18}.
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DR   EMBL; AB004459; BAA20401.1; -; Genomic_DNA.
DR   AlphaFoldDB; P0C889; -.
DR   SMR; P0C889; -.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0009055; F:electron transfer activity; IEA:InterPro.
DR   GO; GO:0020037; F:heme binding; IEA:InterPro.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   Gene3D; 1.10.760.10; -; 1.
DR   InterPro; IPR036909; Cyt_c-like_dom_sf.
DR   InterPro; IPR019604; Cytochrome-c551.
DR   Pfam; PF10643; Cytochrome-c551; 1.
DR   PIRSF; PIRSF000009; Cytochrome_c551; 1.
DR   SUPFAM; SSF46626; SSF46626; 1.
PE   3: Inferred from homology;
KW   Cell inner membrane; Cell membrane; Electron transport; Heme; Iron;
KW   Membrane; Metal-binding; Photosynthesis; Reaction center; Transmembrane;
KW   Transmembrane helix; Transport.
FT   CHAIN           1..206
FT                   /note="Photosynthetic reaction center cytochrome c-551"
FT                   /id="PRO_0000108389"
FT   TRANSMEM        10..30
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        49..69
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        76..96
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   BINDING         152
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /note="covalent"
FT                   /evidence="ECO:0000250|UniProtKB:O07091"
FT   BINDING         155
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /note="covalent"
FT                   /evidence="ECO:0000250|UniProtKB:O07091"
FT   BINDING         156
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|UniProtKB:O07091"
FT   BINDING         182
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|UniProtKB:O07091"
SQ   SEQUENCE   206 AA;  22858 MW;  563427E9BA74B82B CRC64;
     MDNKSNGKLI ALAIGGAVLM GTLFFLVSFL TGYSPAPNHS AILTPLRSFM GWFLLIFCAS
     LIIMGLGKMS GAISDKWFLS FPLSIFVIVM VMFFSLRFYW EKGRTTTVDG KYIRSVEQLN
     DFLNKPAATS DLPPVPADFD FAAAEKLTDA KCNKCHTLGS VADLFRTKYK KTGQVKLIVK
     RMQGFPGANI SDDEVIEIGT WLQEKF