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Information on EC - plastoquinol-plastocyanin reductase

for references in articles please use BRENDA:EC7.1.1.6
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EC Tree
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 to photosystem I (EC 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, quinol---cytochrome-c reductase (complex III) and involves electron bifurcation.
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The enzyme appears in viruses and cellular organisms
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
plastoquinol + 2 oxidized plastocyanin + 2 H+[side 1] = plastoquinone + 2 reduced plastocyanin + 4 H+[side 2]
show the reaction diagram
Spinacia oleracea