AC MF_01335; DC Protein; auto TR HAMAP; MF_01335; -; 1; level=0 XX Names: Cytb6_f_Rieske XX ID UCRI 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 Short=ISP; DE Short=RISP; DE AltName: Full=Rieske iron-sulfur protein; GN Name=petC; XX CC -!- FUNCTION: Component of the cytochrome b6-f complex, which mediates CC electron transfer between photosystem II (PSII) and photosystem I CC (PSI), cyclic electron flow around PSI, and state transitions. 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; case CC -!- COFACTOR: CC Name=[2Fe-2S] cluster; Xref=ChEBI:CHEBI:190135; CC Note=Binds 1 [2Fe-2S] cluster per subunit.; end case CC -!- SUBUNIT: The 4 large subunits of the cytochrome b6-f complex are CC cytochrome b6, subunit IV (17 kDa polypeptide, PetD), cytochrome f and CC the Rieske protein, while the 4 small subunits are PetG, PetL, PetM and CC PetN. The complex functions as a dimer. case CC -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane; Single-pass membrane CC protein. Note=The transmembrane helix obliquely spans the membrane in CC one monomer, and its extrinsic C-terminal domain is part of the other CC monomer. else case not CC -!- SUBCELLULAR LOCATION: Cell inner membrane; Single-pass membrane CC protein. Note=The transmembrane helix obliquely spans the membrane in CC one monomer, and its extrinsic C-terminal domain is part of the other CC monomer. end case case CC -!- MISCELLANEOUS: The Rieske iron-sulfur protein is a high potential 2Fe- CC 2S protein. end case CC -!- SIMILARITY: Belongs to the Rieske iron-sulfur protein family. XX DR PROSITE; PS51296; RIESKE; 1; trigger=yes DR PROSITE; PS51318; TAT; 0-1; trigger=no DR Pfam; PF00355; Rieske; 1; trigger=no DR PRINTS; PR00162; RIESKE; 1; trigger=no DR NCBIfam; TIGR01409; TAT_signal_seq; 1; trigger=no DR General; Transmembrane; -; 1; trigger=yes XX KW Electron transport case KW Thylakoid end case case not KW Cell membrane KW Cell inner membrane end case case KW 2Fe-2S KW Iron KW Iron-sulfur KW Metal-binding end case KW Membrane KW Translocase KW Transmembrane KW Transport KW Transmembrane helix XX GO GO:0045158; F:electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity GO GO:0009496; F:plastoquinol--plastocyanin reductase activity GO GO:0015979; P:photosynthesis case GO GO:0042651; C:thylakoid membrane end case case not GO GO:0005886; C:plasma membrane end case XX FT None XX Size: 172-186; Related: None; Template: P83794; P49728; Scope: Bacteria; Cyanobacteriota Fusion: Nter: None Cter: None Duplicate: in NOSS1, ANAVA, SYNY3 Plasmid: None Comments: May be translocated into the membrane by the TAT pathway but without signal cleavage. In some cases a TAT signal is not recognized by either the PROSITE or TIGRFAMs predictors. XX # Revision 1.41 2023/06/01 //