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Plant Physiol, January 2000, Vol. 122, pp. 127-136

Sustained Photobiological Hydrogen Gas Production upon Reversible Inactivation of Oxygen Evolution in the Green Alga Chlamydomonas reinhardtii1

Anastasios Melis,* Liping Zhang, Marc Forestier, Maria L. Ghirardi, and Michael Seibert

Department of Plant and Microbial Biology, University of California, 111 Koshland Hall, Berkeley, California 94720-3102 (A.M., L.Z.); and Basic Sciences Center, National Renewable Energy Laboratory, Golden, Colorado 80401-3393 (M.F., M.L.G., M.S.).

The work describes a novel approach for sustained photobiological production of H2 gas via the reversible hydrogenase pathway in the green alga Chlamydomonas reinhardtii. This single-organism, two-stage H2 production method circumvents the severe O2 sensitivity of the reversible hydrogenase by temporally separating photosynthetic O2 evolution and carbon accumulation (stage 1) from the consumption of cellular metabolites and concomitant H2 production (stage 2). A transition from stage 1 to stage 2 was effected upon S deprivation of the culture, which reversibly inactivated photosystem II (PSII) and O2 evolution. Under these conditions, oxidative respiration by the cells in the light depleted O2 and caused anaerobiosis in the culture, which was necessary and sufficient for the induction of the reversible hydrogenase. Subsequently, sustained cellular H2 gas production was observed in the light but not in the dark. The mechanism of H2 production entailed protein consumption and electron transport from endogenous substrate to the cytochrome b6-f and PSI complexes in the chloroplast thylakoids. Light absorption by PSI was required for H2 evolution, suggesting that photoreduction of ferredoxin is followed by electron donation to the reversible hydrogenase. The latter catalyzes the reduction of protons to molecular H2 in the chloroplast stroma.


1 The work was supported by the U.S. Department of Energy Hydrogen Research and Development Program under Department of Energy-University of California, Berkeley, Cooperative Agreement (no. DE-FC36-98GO10278 to A.M. and contract no. DE-AC36-98-GO10337 to M.L.G. and M.S.).

* Corresponding author; e-mail melis{at}nature.berkeley.edu; fax 510-642-4995.

© 2000 American Society of Plant Physiologists



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