Isolation of the elusive supercomplex that drives cyclic electron flow in photosynthesis

Masakazu Iwai, Kenji Takizawa, Ryutaro Tokutsu, Akira Okamuro, Yuichiro Takahashi and Jun Minagawa ()
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Masakazu Iwai: Institute of Low Temperature Science, Hokkaido University
Kenji Takizawa: Institute of Low Temperature Science, Hokkaido University
Ryutaro Tokutsu: Institute of Low Temperature Science, Hokkaido University
Akira Okamuro: Faculty of Science, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
Yuichiro Takahashi: Faculty of Science, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
Jun Minagawa: Institute of Low Temperature Science, Hokkaido University

Nature, 2010, vol. 464, issue 7292, 1210-1213

Abstract: Photosynthesis: a supercomplex of supercomplexes During photosynthesis, light energy is utilized by photosystems 1 (PSI) and II (PSII), located in the thylakoid membranes of chloroplasts, to establish an electron flow that ultimately results in the production of ATP and NADPH. Two modes of electron flow exist — a linear electron flow and a cyclic electron flow. The latter pathway generates more ATP but the molecular components of the supercomplex involved in the process have remained elusive. This issue is now addressed directly in the green alga Chlamydomonas reinhardtii. A combination of biochemical and spectroscopic techniques reveals the supercomplex that drives cyclic electron flow to be made up not only of the photosystem/peripheral antenna supercomplex, but also of two known redox proteins — cytochrome b6f complex and ferredoxin-NADPH oxidoreductase (FNR) — with a few small proteins as well.

Date: 2010
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DOI: 10.1038/nature08885

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