No Evidence for a Specific Function of Ca2+ and Cl− in Oxygen Evolution of Isolated PSII-Complexes from Thermophilic Cyanobacteria
Evidence has been presented in the last years that there is a specific requirement for calcium and chloride in the process of water oxidation . Most of these investigations have been performed on PSII from higher plants, where this ion requirement has been found to be dependent on the presence, or rather absence, of the extrinsic 17 and 23 kDa proteins. PSII from cyanobacteria lacks these proteins. Therefore it is of interest to investigate the effect of various salts on photosynthetic water oxidation in PSII-complexes from Synechococcus Sp. This was performed by measuring flash induced oxygen yield. Significant differences compared to higher plants have been observed.
KeywordsOxygen Evolution Water Oxidation Additional Salt Oxygen Yield Irreversible Inactivation
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