What is it about?
Photosynthetic hydrogen production in green algae is catalyzed by the oxygen-sensitive hydrogenase enzyme, which accept electrons from photosynthetically reduced ferredoxin and reduce protons to molecular hydrogen (H2). Since the process occurs downstream of photosystem I, the contribution of photosystem II (PSII) in H2 photoproduction has long been a subject of debate. Indeed, water oxidation by PSII results in accumulation of molecular oxygen in chloroplasts, which inhibits H2 evolution. Therefore, clear evidence for direct water biophotolysis resulting in simultaneous H2 and O2 releases in algae has never been presented. This paper demonstrates that sustained H2 photoproduction in algal cells is directly linked to PSII-dependent water oxidation.
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This page is a summary of: Water oxidation by photosystem II is the primary source of electrons for sustained H
photoproduction in nutrient-replete green algae, Proceedings of the National Academy of Sciences, November 2020, Proceedings of the National Academy of Sciences, DOI: 10.1073/pnas.2009210117.
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