Function of the Chloroplast Hydrogenase in the Microalga Chlamydomonas: The Role of Hydrogenase and State Transitions during Photosynthetic Activation in Anaerobiosis

摘要: Like a majority of photosynthetic microorganisms, the green unicellular alga Chlamydomonas reinhardtii may encounter O2 deprived conditions on regular basis. In response to anaerobiosis or in respiration defective context, electron transport chain is remodeled by state transition process conformation that favours photoproduction ATP at expense reductant synthesis. some algae including Chlamydomonas, anoxia also triggers induction chloroplast-located, oxygen sensitive hydrogenase, which accepts electrons from reduced ferredoxin convert protons into molecular hydrogen. Although microalgal hydrogen evolution has received much interest for its biotechnological potential, physiological role remains unclear. By using specific mutants, we demonstrate ability and hydrogenase function are both critical photosynthesis anoxia. These two processes thus important survival cells when they transiently placed an anaerobic environment.