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Cyclic electron flow in Chlamydomonas reinhardtii

View ORCID ProfileW. J. Nawrocki, B. Bailleul, View ORCID ProfileP. Cardol, View ORCID ProfileF. Rappaport, F.-A. Wollman, P. Joliot
doi: https://doi.org/10.1101/153288
W. J. Nawrocki
1Institut de Biologie Physico-Chimique, UMR 7141 CNRS-UPMC, 13 rue P. et M. Curie 75005, Paris, France
2Laboratoire de Génétique et Physiologie des Microalgues, Institut de Botanique, Université de Liège, 4, Chemin de la Vallée, B-4000 Liège, Belgium
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B. Bailleul
1Institut de Biologie Physico-Chimique, UMR 7141 CNRS-UPMC, 13 rue P. et M. Curie 75005, Paris, France
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P. Cardol
2Laboratoire de Génétique et Physiologie des Microalgues, Institut de Botanique, Université de Liège, 4, Chemin de la Vallée, B-4000 Liège, Belgium
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F. Rappaport
1Institut de Biologie Physico-Chimique, UMR 7141 CNRS-UPMC, 13 rue P. et M. Curie 75005, Paris, France
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F.-A. Wollman
1Institut de Biologie Physico-Chimique, UMR 7141 CNRS-UPMC, 13 rue P. et M. Curie 75005, Paris, France
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  • For correspondence: wollman@ibpc.fr
P. Joliot
1Institut de Biologie Physico-Chimique, UMR 7141 CNRS-UPMC, 13 rue P. et M. Curie 75005, Paris, France
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Abstract

Cyclic electron flow (CEF), one of the major alternative electron transport pathways to the primary linear electron flow (LEF) in chloroplasts has been discovered in the middle of the last century. It is defined as a return of the reductants from the acceptor side of the Photosystem I (PSI) to the pool of its donors via the cytochrome b6f, and has proven essential for photosynthesis. However, despite many efforts aimed at its characterisation, the pathway and regulation of CEF remain equivocal, and its physiological significance remains to be properly defined. Here we use novel spectroscopic approaches to measure CEF in transitory conditions in the green alga Chlamydomonas reinhardtii. We show that CEF operates at the same maximal rate regardless of the oxygen concentration, and that the latter influences LEF, rather than CEF in vivo, which questions the recent hypotheses about the CEF supercomplex formation. We further reveal that the pathways proposed for CEF in the literature are inconsistent with the kinetic information provided by our measurements. We finally provide cues on the regulation of CEF by light.

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Posted June 21, 2017.
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Cyclic electron flow in Chlamydomonas reinhardtii
W. J. Nawrocki, B. Bailleul, P. Cardol, F. Rappaport, F.-A. Wollman, P. Joliot
bioRxiv 153288; doi: https://doi.org/10.1101/153288
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Cyclic electron flow in Chlamydomonas reinhardtii
W. J. Nawrocki, B. Bailleul, P. Cardol, F. Rappaport, F.-A. Wollman, P. Joliot
bioRxiv 153288; doi: https://doi.org/10.1101/153288

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