ID   UCRI_CHLTI              Reviewed;         181 AA.
AC   Q46136;
DT   01-NOV-1997, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 2.
DT   03-AUG-2022, entry version 106.
DE   RecName: Full=Cytochrome b6-f complex iron-sulfur subunit;
DE            EC=7.1.1.6;
DE   AltName: Full=Plastohydroquinone:plastocyanin oxidoreductase iron-sulfur protein;
DE   AltName: Full=Rieske iron-sulfur protein;
DE            Short=ISP;
DE            Short=RISP;
GN   Name=petC;
OS   Chlorobaculum thiosulfatiphilum (Chlorobium limicola f.sp.
OS   thiosulfatophilum).
OC   Bacteria; Chlorobi; Chlorobia; Chlorobiales; Chlorobiaceae; Chlorobaculum.
OX   NCBI_TaxID=115852;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA], AND PROTEIN SEQUENCE OF 2-35.
RA   Schuetz M., Zirngibl S., le Coutre J., Buettner M., Xie D.-L., Nelson N.,
RA   Deutzmann R., Hauska G.;
RT   "A transcription unit for the Rieske FeS-protein and cytochrome b in
RT   Chlorobium limicola.";
RL   Photosyn. Res. 39:163-174(1994).
CC   -!- FUNCTION: Component of the green S-bacteria bc-complex which consists
CC       of the Rieske protein and cytochrome b subunit and which appears to
CC       lack a cytochrome c1-equivalent. This complex has a comparatively low
CC       redox potential.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a plastoquinol + 2 H(+)(in) + 2 oxidized [plastocyanin] = a
CC         plastoquinone + 4 H(+)(out) + 2 reduced [plastocyanin];
CC         Xref=Rhea:RHEA:22148, Rhea:RHEA-COMP:9561, Rhea:RHEA-COMP:9562,
CC         Rhea:RHEA-COMP:10039, Rhea:RHEA-COMP:10040, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:17757, ChEBI:CHEBI:29036, ChEBI:CHEBI:49552,
CC         ChEBI:CHEBI:62192; EC=7.1.1.6;
CC   -!- COFACTOR:
CC       Name=[2Fe-2S] cluster; Xref=ChEBI:CHEBI:190135;
CC         Evidence={ECO:0000255|PROSITE-ProRule:PRU00628};
CC       Note=Binds 1 [2Fe-2S] cluster per subunit. {ECO:0000255|PROSITE-
CC       ProRule:PRU00628};
CC   -!- SUBCELLULAR LOCATION: Cell inner membrane {ECO:0000305}; Multi-pass
CC       membrane protein {ECO:0000305}.
CC   -!- MISCELLANEOUS: The Rieske protein is a high potential 2Fe-2S protein.
CC   -!- SIMILARITY: Belongs to the Rieske iron-sulfur protein family.
CC       {ECO:0000305}.
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DR   EMBL; X73628; CAA52007.1; -; Genomic_DNA.
DR   PIR; S38460; S38460.
DR   AlphaFoldDB; Q46136; -.
DR   SMR; Q46136; -.
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:0051537; F:2 iron, 2 sulfur cluster binding; IEA:UniProtKB-KW.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0009496; F:plastoquinol--plastocyanin reductase activity; IEA:UniProtKB-EC.
DR   Gene3D; 2.102.10.10; -; 1.
DR   InterPro; IPR017941; Rieske_2Fe-2S.
DR   InterPro; IPR036922; Rieske_2Fe-2S_sf.
DR   InterPro; IPR014349; Rieske_Fe-S_prot.
DR   InterPro; IPR005805; Rieske_Fe-S_prot_C.
DR   PANTHER; PTHR10134; PTHR10134; 1.
DR   Pfam; PF00355; Rieske; 1.
DR   PRINTS; PR00162; RIESKE.
DR   SUPFAM; SSF50022; SSF50022; 1.
DR   PROSITE; PS51296; RIESKE; 1.
PE   1: Evidence at protein level;
KW   2Fe-2S; Cell inner membrane; Cell membrane; Direct protein sequencing;
KW   Disulfide bond; Electron transport; Iron; Iron-sulfur; Membrane;
KW   Metal-binding; Translocase; Transmembrane; Transmembrane helix; Transport.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000269|Ref.1"
FT   CHAIN           2..181
FT                   /note="Cytochrome b6-f complex iron-sulfur subunit"
FT                   /id="PRO_0000127772"
FT   TRANSMEM        53..73
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        114..134
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   DOMAIN          85..178
FT                   /note="Rieske"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00628"
FT   REGION          1..35
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1..22
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   BINDING         124
FT                   /ligand="[2Fe-2S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:190135"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00628"
FT   BINDING         126
FT                   /ligand="[2Fe-2S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:190135"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00628"
FT   BINDING         142
FT                   /ligand="[2Fe-2S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:190135"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00628"
FT   BINDING         145
FT                   /ligand="[2Fe-2S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:190135"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00628"
FT   DISULFID        129..144
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00628"
SQ   SEQUENCE   181 AA;  19039 MW;  BD897E2DD1B8D3C6 CRC64;
     MAQTGNFKSP ARMSSLGQGA APASSGAVTG GKPREGGLKG VDFERRGFLH KIVGGVGAVV
     AVSTLYPVVK YIIPPARKIK NVDELTVGKA SEVPDGKSKI FQFNEDKVIV VNKGGALTAV
     SAVCTHLGCL VNWVDADNQY FCPCHGAKYK LTGEIISGPQ PLPLKQYKAR IEGDSIIISK
     A