Enzymatic phosphorylation of acetate.

Irwin A. Rose,Marianne Grunberg-Manago,S. R. Korey,Severo Ochoa

Published 1954 in Journal of Biological Chemistry

ABSTRACT

The metabolic utilization of acetate (oxidation via the citric acid cycle, synthesis of higher fatty acids, cholesterol, and possibly other compounds) requires a preliminary activation through conversion to acetyl C0A.l Two main mechanisms are known to bring about this activation (2). One of these mechanisms, utilized by animal tissues, yeast, and some bacteria, seems to involve a single enzyme, usually referred to as the acetate activating enzyme, catalyzing the reversible conversion of ATP, acetate, and CoA to AMP, PP, and acetyl CoA (3-5). The other mechanism, which appears to be restricted to bacteria,2 involves two enzymes, acetokinase (7) and transacetylase (8), catalyzing Reactions 1 and 2 respectively. The net result is Reaction 3. A reversible reaction between ATP and acetate was first described by Lipmann in extracts of La&bacillus delbrueckii (9) and later by Stadtman and Barker in extracts of Clostridium kluyveri (10). The formation of

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