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National Academy of Sciences, Proceedings of the National Academy of Sciences, 47(117), p. 29629-29636, 2020

DOI: 10.1073/pnas.2009210117

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Water oxidation by photosystem II is the primary source of electrons for sustained H <sub>2</sub> photoproduction in nutrient-replete green algae

Journal article published in 2020 by Sergey Kosourov ORCID, Valéria Nagy ORCID, Dmitry Shevela ORCID, Martina Jokel ORCID, Johannes Messinger ORCID, Yagut Allahverdiyeva ORCID
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Significance Photosynthetic H 2 production in the green alga Chlamydomonas reinhardtii is catalyzed by O 2 -sensitive [FeFe]-hydrogenases, which accept electrons from photosynthetically reduced ferredoxin and reduce protons to H 2 . Since the process occurs downstream of photosystem I, the contribution of photosystem II (PSII) in H 2 photoproduction has long been a subject of debate. Indeed, water oxidation by PSII results in O 2 accumulation in chloroplasts, which inhibits H 2 evolution. Therefore, clear evidence for direct water biophotolysis resulting in simultaneous H 2 and O 2 releases in algae has never been presented. This paper demonstrates that sustained H 2 photoproduction in C. reinhardtii is directly linked to PSII-dependent water oxidation and brings insights into regulation of PSII activity and H 2 production by CO 2 /HCO 3 – under microoxic conditions.