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HAMAP rule MF_01335

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General rule information [?]

Accession	MF_01335
Dates	2-JUN-2005 (Created) 1-JUN-2023 (Last updated, Version 41)
Name	Cytb6_f_Rieske
Scope(s)	Bacteria Cyanobacteriota
Template(s)	P83794 (UCRI_MASLA); P49728 (UCRIA_CHLRE); [ Recover all ]
Triggered by	HAMAP; MF_01335 (Get profile general information and statistics)

Propagated annotation [?]

Identifier, protein and gene names [?]

Identifier	UCRI
Protein name	RecName: Full=Cytochrome b6-f complex iron-sulfur subunit; EC=7.1.1.6; AltName: Full=Plastohydroquinone:plastocyanin oxidoreductase iron-sulfur protein; Short=ISP; Short=RISP; AltName: Full=Rieske iron-sulfur protein;
Gene name	Name=petC;

Comments [?]

FUNCTION	Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions.
CATALYTIC ACTIVITY	Reaction=a plastoquinol + 2 H(+)(in) + 2 oxidized [plastocyanin] = a plastoquinone + 4 H(+)(out) + 2 reduced [plastocyanin]; Xref=Rhea:RHEA:22148, Rhea:RHEA-COMP:9561, Rhea:RHEA-COMP:9562, Rhea:RHEA-COMP:10039, Rhea:RHEA-COMP:10040, ChEBI:CHEBI:15378, ChEBI:CHEBI:17757, ChEBI:CHEBI:29036, ChEBI:CHEBI:49552, ChEBI:CHEBI:62192; EC=7.1.1.6;
case <Feature:PS51296>
COFACTOR	Name=[2Fe-2S] cluster; Xref=ChEBI:CHEBI:190135; Note=Binds 1 [2Fe-2S] cluster per subunit.;
end case
SUBUNIT	The 4 large subunits of the cytochrome b6-f complex are cytochrome b6, subunit IV (17 kDa polypeptide, PetD), cytochrome f and the Rieske protein, while the 4 small subunits are PetG, PetL, PetM and PetN. The complex functions as a dimer.
case <Property:Thylakoid>
SUBCELLULAR LOCATION	Cellular thylakoid membrane; Single-pass membrane protein. Note=The transmembrane helix obliquely spans the membrane in one monomer, and its extrinsic C-terminal domain is part of the other monomer.
else case not <Property:Thylakoid>
SUBCELLULAR LOCATION	Cell inner membrane; Single-pass membrane protein. Note=The transmembrane helix obliquely spans the membrane in one monomer, and its extrinsic C-terminal domain is part of the other monomer.
end case
case <Feature:PS51296>
MISCELLANEOUS	The Rieske iron-sulfur protein is a high potential 2Fe- 2S protein.
end case
SIMILARITY	Belongs to the Rieske iron-sulfur protein family.

Keywords [?]

Electron transport
case <Property:Thylakoid>
Thylakoid
end case
case not <Property:Thylakoid>
Cell membrane
Cell inner membrane
end case
case <Feature:PS51296>
2Fe-2S
Iron
Iron-sulfur
Metal-binding
end case
Membrane
<a href="https://www.uniprot.org/keywords/KW-1278">Translocase</a>
Transmembrane
Transport
Transmembrane helix

Gene Ontology [?]

GO:0045158; Molecular function:electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity
GO:0009496; Molecular function:plastoquinol--plastocyanin reductase activity
GO:0015979; Biological process:photosynthesis
case <Property:Thylakoid>
GO:0042651; Cellular component:thylakoid membrane
end case
case not <Property:Thylakoid>
GO:0005886; Cellular component:plasma membrane
end case

Cross-references [?]

PROSITE	PS51296; RIESKE; 1;
PROSITE	PS51318; TAT; 0-1;
Pfam	PF00355; Rieske; 1;
PRINTS	PR00162; RIESKE; 1;
NCBIfam	TIGR01409; TAT_signal_seq; 1;
General	Transmembrane; -; 1;

Features [?]

Additional information [?]

Size range	172-186 amino acids
Related rules	None
Fusion	Nter: None Cter: 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.

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