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- ArticleMidelfort CF, Sarton-Miller I.J Biol Chem. 1978 Oct 25;253(20):7127-9.The purified alpha-thiophosphate diastereoisomers of adenosine 5'-(1-thio)-triphosphate were used to study the stereochemical course of the reaction catalyzed by yeast acetyl-CoA synthetase. Asymmetrically labeled adenosine 5'-thiophosphate was formed from the "B" diastereoisomer of adenosine 5'-(1-thio)-triphosphate and [18O]acetate. The label was found to be in the opposite orientation from the leaving pyrophosphate group showing that the acetate activation step occurred with inversion of configuration at the alpha-phosphorus.