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Kinetic challenges facing oxalate, malonate, acetoacetate, and oxaloacetate decarboxylases.

ABSTRACT: To compare the powers of the corresponding enzymes as catalysts, the rates of uncatalyzed decarboxylation of several aliphatic acids (oxalate, malonate, acetoacetate, and oxaloacetate) were determined at elevated temperatures and extrapolated to 25 °C. In the extreme case of oxalate, the rate of the uncatalyzed reaction at pH 4.2 was 1.1 × 10(-12) s(-1), implying a 2.5 × 10(13)-fold rate enhancement by oxalate decarboxylase. Whereas the enzymatic decarboxylation of oxalate requires O(2) and Mn(II), the uncatalyzed reaction is unaffected by the presence of these cofactors and appears to proceed by heterolytic elimination of CO(2).

SUBMITTER: Wolfenden R

PROVIDER: S-EPMC3077560 | biostudies-literature | 2011 Apr

REPOSITORIES: biostudies-literature

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Kinetic challenges facing oxalate, malonate, acetoacetate, and oxaloacetate decarboxylases.

Wolfenden Richard R Lewis Charles A CA Yuan Yang Y

Journal of the American Chemical Society 20110324 15

To compare the powers of the corresponding enzymes as catalysts, the rates of uncatalyzed decarboxylation of several aliphatic acids (oxalate, malonate, acetoacetate, and oxaloacetate) were determined at elevated temperatures and extrapolated to 25 °C. In the extreme case of oxalate, the rate of the uncatalyzed reaction at pH 4.2 was 1.1 × 10(-12) s(-1), implying a 2.5 × 10(13)-fold rate enhancement by oxalate decarboxylase. Whereas the enzymatic decarboxylation of oxalate requires O(2) and Mn(I ...[more]

PMID: 21434608

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Dataset Information

Kinetic challenges facing oxalate, malonate, acetoacetate, and oxaloacetate decarboxylases.

Publications

Kinetic challenges facing oxalate, malonate, acetoacetate, and oxaloacetate decarboxylases.

Similar Datasets

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