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EC 7.1.1.10 Details
EC number
7.1.1.10
Accepted name
ferredoxin—quinone oxidoreductase (H+-translocating)
Reaction
2 reduced ferredoxin [iron-sulfur] cluster + plastoquinone + 6 H+[side 1] = 2 oxidized ferredoxin [iron-sulfur] cluster + plastoquinol + 7 H+[side 2]
Other name(s)
NDH-1L complex, NDH-1L&prime, complex, NDH11 complex, NDH12 complex
Systematic name
ferredoxin:quinone oxidoreductase (H+-translocating)
Comment
The enzyme, present in plants and cyanobacteria, couples electron transport from ferredoxin to plastoquinone and proton pumping from the cytoplasm to the thylakoid lumen. It participates in cyclic electron flow, retuning electrons generated by photosystem I to the plastoquinone pool, thus bypassing the generation of reducing power. It may also participate in respiration using electrons originating from NADPH via the action of EC 1.18.1.2, ferredoxin—NADP+ reductase (FNR) operating in the direction of ferredoxin reduction. It is a large complex, with some of its subunits resembling those from the bacterial/mitochondrial EC 7.1.1.2, NADH:ubiquinone reductase (H+-translocating). However, it lacks the NADH-oxidizing module and instead has a module that interacts with ferredoxin. Several forms of the enzyme exist, differing in their exact combination of subunits used. Some of the forms participate in carbon dioxide hydration rather than electron transfer.
History
created 2021
EC Tree
1.1.5.1 created 1983, deleted 2002