Abstract
ADP was shown to inhibit phosphoglycerate-dependent O2 evolution in a simplified reconstituted chloroplast system containing 3-phosphoglycerate kinase and triose phosphate dehydrogenase. Rates of O2 evolution in the simplified system are comparable with those obtained by using stromal protein rather than purified enzymes. ADP does not inhibit O2 evolution with glycerate 1,3-biphosphate as substrate nor does it inhibit triose phosphate dehydrogenase. The inhibitory effect of ADP is attributed to an increase in the rate of conversion of glycerate biphosphate into phosphoglycerate. The results are discussed in terms of control by ADP of phosphoglycerate-dependent oxygen evolution.
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