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Information on EC 7.1.1.6 - plastoquinol-plastocyanin reductase

for references in articles please use BRENDA:EC7.1.1.6

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IUBMB Comments

Contains two b-type cytochromes, two c-type cytochromes (cn and f), and a [2Fe-2S] Rieske cluster. The enzyme plays a key role in photosynthesis, transferring electrons from photosystem II (EC 1.10.3.9) to photosystem I (EC 1.97.1.12). Cytochrome c-552 can act as acceptor instead of plastocyanin, but more slowly. In chloroplasts, protons are translocated through the thylakoid membrane from the stroma to the lumen. The mechanism occurs through the Q cycle as in EC 7.1.1.8, quinol—cytochrome-c reductase (complex III) and involves electron bifurcation.

The expected taxonomic range for this enzyme is: Bacteria, Eukaryota, Archaea

Synonyms
rieske iron-sulfur protein, cytochrome b6f complex, cytochrome b(6)f complex, cytochrome b6f, cytochrome b6/f complex, rieske fe-s protein, cytochrome b6-f complex, cytochrome b6 f complex, cyt b6f complex, rieske [2fe-2s] protein, more

REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
plastoquinol + 2 oxidized plastocyanin + 2 H+[side 1] = plastoquinone + 2 reduced plastocyanin + 4 H+[side 2]
show the reaction diagram
PATHWAY SOURCE
PATHWAYS
MetaCyc
cyclic electron flow, NADPH to cytochrome c oxidase via plastocyanin, photosynthesis light reactions, succinate to chytochrome c oxidase via cytochrome c6, succinate to cytochrome c oxidase via plastocyanin