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• W2090432387 abstract "CO dehydrogenase from Clostridium thermoaceticum is a nickel-containing enzyme that catalyzes both the reversible conversion of CO2 to CO (for incorporation into the carbonyl group of acetate) and the synthesis of acetyl-CoA from methyl corrinoid, CO, and CoASH. The latter activity is conveniently assayed by monitoring the exchange of [1-14C]acetyl-CoA (carbonyl group) with 12CO. Kinetic parameters for the highly oxygen sensitive exchange activity have been determined: Km (acetyl-CoA) = 600 microM; Vmax = 440 min-1. In addition, coenzyme A analogues have been tested as inhibitors of the exchange to probe the active site of the enzyme; each has no effect on the CO2 in equilibrium CO activity of CO dehydrogenase. Coenzyme A, the substrate for acetate biosynthesis, is a potent competitive inhibitor, KI = 7 microM. Comparison of this value with that for desulfo-CoA (KI = 6000 microM) suggests that a key mode of binding is through the sulfur atom, possibly to a metal site on the enzyme. The relatively high affinity of the enzyme for CoASH relative to acetyl-CoA is consistent with its proposed operation in the acetogenic direction. The differential sensitivity to oxygen and storage of the two activities of CO dehydrogenase as well as the contrasting effect of coenzyme A inhibitors suggests that acetate assemblage occurs at a site distinct from that for CO dehydrogenation." @default.
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• W2090432387 date "1988-10-04" @default.
• W2090432387 modified "2023-09-25" @default.
• W2090432387 title "Kinetic characterization of the carbon monoxide-acetyl-CoA (carbonyl group) exchange activity of the acetyl-CoA synthesizing carbon monoxide dehydrogenase from Clostridium thermoaceticum" @default.
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• W2090432387 doi "https://doi.org/10.1021/bi00420a019" @default.
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