ID   CYC3C_DESAF             Reviewed;          45 AA.
AC   P82989;
DT   15-FEB-2005, integrated into UniProtKB/Swiss-Prot.
DT   01-JUN-2001, sequence version 1.
DT   03-AUG-2022, entry version 36.
DE   RecName: Full=Cytochrome c3;
DE   Flags: Fragment;
OS   Desulfocurvibacter africanus (Desulfovibrio africanus).
OC   Bacteria; Proteobacteria; Deltaproteobacteria; Desulfovibrionales;
OC   Desulfovibrionaceae; Desulfocurvibacter.
OX   NCBI_TaxID=873;
RN   [1] {ECO:0000305}
RP   PROTEIN SEQUENCE, FUNCTION, SUBUNIT, AND HEME-BINDING.
RC   STRAIN=ATCC 19996 / DSM 2603 / NCIMB 8401 / Benghazi;
RX   PubMed=8573595; DOI=10.1016/0005-2728(95)00129-8;
RA   Pieulle L., Haladjian J., Bonicel J., Hatchikian E.C.;
RT   "Biochemical studies of the c-type cytochromes of the sulfate reducer
RT   Desulfovibrio africanus. Characterization of two tetraheme cytochromes c3
RT   with different specificity.";
RL   Biochim. Biophys. Acta 1273:51-61(1996).
CC   -!- FUNCTION: Participates in sulfate respiration coupled with
CC       phosphorylation by transferring electrons from the enzyme dehydrogenase
CC       to ferredoxin. {ECO:0000269|PubMed:8573595}.
CC   -!- SUBUNIT: Homodimer. {ECO:0000269|PubMed:8573595}.
CC   -!- SUBCELLULAR LOCATION: Periplasm {ECO:0000250}.
CC   -!- PTM: Binds 4 heme groups per subunit. {ECO:0000269|PubMed:8573595}.
CC   -!- MISCELLANEOUS: Acidic tetraheme c3 is not a subunit of this octaheme
CC       cytochrome c3. {ECO:0000269|PubMed:8573595}.
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DR   AlphaFoldDB; P82989; -.
DR   GO; GO:0042597; C:periplasmic space; IEA:UniProtKB-SubCell.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0009061; P:anaerobic respiration; IEA:UniProtKB-KW.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Electron transport; Heme; Iron; Metal-binding;
KW   Periplasm; Sulfate respiration; Transport.
FT   CHAIN           1..>45
FT                   /note="Cytochrome c3"
FT                   /id="PRO_0000108354"
FT   BINDING         42
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_label="1"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000269|PubMed:8573595"
FT   BINDING         45
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_label="3"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000269|PubMed:8573595"
FT   NON_TER         45
FT                   /evidence="ECO:0000303|PubMed:8573595"
SQ   SEQUENCE   45 AA;  5114 MW;  1A67207235DD4DB4 CRC64;
     SETETKAASI EAETVLQFPV SFKFNRPEGR PTALFAEVKF SHYDH