Abstract
In oxygen-evolving photosynthesis, photochemical energy conversion occurs via electron transport in the thylakoid membranes, resulting in the reduction of NADP+ in the stroma and the concomitant pumping of protons into the thylakoid lumen. Those electrons flow into two different pathways in the thylakoid membranes: the linear electron flow pathway from water to NADP+ via photosystem II and photosystem I (PSI) in series and the cyclic electron flow pathway around PSI. While the operational site(s) for the cyclic electron flow has been elusive, recent studies are unraveling its molecular details. After providing an overview of the general understanding of the cyclic electron flow, this review focuses on a recent report on the super-supercomplex that is composed of the cytochrome b6f complex, photosystem I with its own light-harvesting complex, the light-harvesting complex for photosystem II, and the ferredoxin-NADPH oxidoreductase, which exhibits cyclic electron flow in the green unicellular alga Chlamydomonas reinhardtii.
Published Version
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