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- W2058049663 abstract "The rate of deuterium exchange between [1-(S)-2H]dihydroxyacetone 3-phosphate and the solvent catalyzed by native and metal-substituted yeast aldolases has been measured. In the presence of 0.1 M potassium acetate at 15 degrees C, pH 7.3, the deuterium exchange reaction catalyzed by native yeast aldolase has a kcat of 95 s-1. In contrast to the 7-fold activity enhancement by 0.1 M potassium ion (relative to 0.1 M sodium ion) of the cleavage of D-fructose 1,6-bisphosphate catalyzed by native yeast aldolase, a negligible (1.1-fold) activation by 0.1 M potassium ion is observed in the rate of dedeuteration of [1(S)-2H]dihydroxyacetone 3-phosphate. The order of reactivity of the yeast metalloaldolases in the deuterium exchange roughly parallels that seen in the fructose bisphosphate cleavage reaction. These findings suggest that the carbonyl groups of enzyme-bound D-fructose 1,6-bisphosphate and dihydroxyacetone phosphate are both polarized by the active site divalent metal cation. A mechanistic formulation consistent with the results of this and the previous paper is presented." @default.
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- W2058049663 date "1983-01-04" @default.
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- W2058049663 title "Role of mono- and divalent metal cations in the catalysis by yeast aldolase" @default.
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- W2058049663 doi "https://doi.org/10.1021/bi00270a019" @default.
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