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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 operating in the direction
of ferredoxin reduction.
It is a large complex, with some of its subunits resembling those
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