Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 41, Issue 28, Pages 11949-11959Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.01.172
Keywords
Bidirectional hydrogenase; Synechocystis; Cyanobacteria; Hydrogen uptake; Electron transport; Photosynthesis
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Funding
- B. Swette through the ASU President's Fusion Fund
- School of Life Sciences, ASU
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In anaerobic conditions the NiFe hydrogenase in the cyanobacterium Synechocystis sp. PCC 6803 catalyzes transient H-2 production upon a darkness-to-light transition, followed by a rapid H-2 uptake. We measured H-2 uptake in Synechocystis mutants lacking photosystem I, photosystem II or terminal oxidases and in the wild-type strain with and without active cytochrome b(6)f Rapid light-induced H-2 uptake was dependent on cytochrome b(6)f and the presence of photosystem I. We propose light-dependent electron transport from H-2 to plastoquinone, probably via NAD(P)H dehydrogenase, and on to cytochrome b(6)f and photosystem I. In darkness H-2 uptake is similar to 10-fold slower than in the light and is independent of thylakoid redox components. The plastoquinone redox state may be key in determining the ultimate H-2 redox partner. H-2 uptake and production in darkness likely use the same redox partners. NADH and NADPH, but not reduced ferredoxin, were confirmed as hydrogenase redox donors in vitro. (C) 2016 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
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