Journal of the American Chemical Society p. 2541 - 2549 (1989)
Update date:2022-08-05
Topics:
Cheong, Minsek
Leussing, D.L
The effects of Mg(2+) and Zn(2+) on rates of disappearance of enzymically generated enolpyruvate along parallel ketonization and pyruvate addition paths have been measured spectrophotometrically in acetate buffers.Zn(2+) -dependent rates of ketonization show acetate- and solvent-catalyzed pathways with rate constants of (3.2 +/- 0.6)E4 M-2 s-1 and (1.3 +/- 0.4)E2 M-1 s-1.The former value is consistent with rate constants earlier determined for Mg(2+)-, Mn((2+)-, and Cu(2+)-dependent ketonization, and, in accordance with the Marcus function and as found withthese earlier systems, the rate constant is in close agreement with the value predicted from the rate of decarboxylation of the corresponding metal ion complex of oxalacetate.Enolpyruvate adds to pyruvate in metal ion dependent step to yield pyruvate dimer (1), according to the rate law ratedimer formation = k
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Doi:10.1055/s-1997-3212
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