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HAMAP annotation rule: MF_01335
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General rule information

Accession MF_01335
Dates 2-JUN-2005 (Created)
2-DEC-2010 (Last updated, Version 25)
Data class Protein
Predictors HAMAP; MF_01335; [distribution of match scores in UniProtKB];[seed alignment for MF_01335]
Names Cytb6_f_Rieske


Propagated annotation

Identifier, protein and gene names
Identifier UCRI
Protein name
RecName: Full=Cytochrome b6-f complex iron-sulfur subunit;
EC=1.10.99.1;
AltName: Full=Plastohydroquinone:plastocyanin oxidoreductase iron-sulfur protein;
Short=ISP;
Short=RISP;
AltName: Full=Rieske iron-sulfur protein;
Gene 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 (By similarity).
CATALYTIC ACTIVITY: Plastoquinol-1 + 2 oxidized plastocyanin = plastoquinone + 2 reduced plastocyanin.

case <Feature:PS51296>
COFACTOR: Binds 1 2Fe-2S cluster per subunit (By similarity).
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 (By similarity).

case <Property:Thylakoid>
SUBCELLULAR LOCATION: Cellular thylakoid membrane; Single-pass membrane protein (By similarity). Note=The transmembrane helix obliquely spans the membrane in one monomer, and its extrinsic C-terminal domain is part of the other monomer (By similarity).

else case not <Property:Thylakoid>
SUBCELLULAR LOCATION: Cell inner membrane; Single-pass membrane protein (By similarity). Note=The transmembrane helix obliquely spans the membrane in one monomer, and its extrinsic C-terminal domain is part of the other monomer (By similarity).
end case


case <Feature:PS51296>
MISCELLANEOUS: The Rieske iron-sulfur protein is a high potential 2Fe-2S protein.
SIMILARITY: Contains 1 Rieske domain.
end case

Cross-references
PROSITE PS51296; RIESKE; 1; trigger=PRU00628;
PS51318; TAT; 0-1;
Pfam PF00355; Rieske; 1;
PRINTS PR00162; RIESKE; 1;
TIGRFAMs TIGR01409; TAT_signal_seq; 1;
General Transmembrane; -; 1; trigger=Yes;
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, Oxidoreductase, 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.
GO:0055114; Biological process: oxidation-reduction process.

case <Property:Thylakoid>
GO:0042651; Cellular component: thylakoid membrane.
end case


case not <Property:Thylakoid>
GO:0005886; Cellular component: plasma membrane.
end case



Additional information

Size range: 172-186 amino acids
Related UniRules: None
Template: P83794 (UCRI_MASLA); P49728 (UCRIA_CHLRE): [Recover all]
Scope: Bacteria; Cyanobacteria
Fusion: Nter: None; Cter: None
Duplicate: in NOSS1, ANAVA, SYNY3
Plasmid encoded: 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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UniProtKB rule member sequences