Abstract
Effect of sulfate on the oxygen evolution in barley Photosystem II membrane fraction was investigated. Purified Photosystem II membrane fraction was exposed to sulfate effect in dark or under dim light illumination. The presence of 10 mM CaCl2 during the sulfate treatments prevented the loss of oxygen evolution. The protection was complete even at the concentration of 50 mM Na2SO4. However, light stimulated sulfate inhibition of oxygen evolution by the Photosystem II. After incubation with sulfate, we found there was depletion of 18 and 23 kDa polypeptides in Photosystem II complex. Here we provide new evidence that sulfate inhibition of oxygen evolution can be caused by depletion of chloride and calcium ions from the water splitting complex rather than by partial depletion of 18 and 23 kDa polypeptides from the complex.
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Beauregard, M., Morin, L. & Popovic, R. Sulfate inhibition of photosystem II oxygen evolving complex. Appl Biochem Biotechnol 16, 109–117 (1987). https://doi.org/10.1007/BF02798360
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DOI: https://doi.org/10.1007/BF02798360