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When butyrate or vinylacetate is oxidized by enzyme preparations of Clostridium kluyveri in the absence of orthophosphate, acetoacetate is a major end product (Kennedy and Barker, 1951b). Indirect evidence was given also for the formation of a nonvolatile product during the oxidation of caproate under imilar conditions, but the compound was not identified. If the oxidation of valerate and caproate occurs by a sequence of reactions similar to that involved in butyrate oxidation, the corresponding ,B-keto acids should accumulate in the absece of phosphate. In the present paper this expectation is shown to be correct. C. kluyveri preparations also catalyze a "phosphoroclastic" decomposition of acetoacetate yielding acetate and acetylphosphate (Stadtman and Barker, 1949b). We have found that the higher homologues, g-ketovalerate and ,B-ketocaproate, are decomposed in a similar manner. Some observations are reported on the relative rates of decomposition of the ,B-keto acids, the inhibitory action of fatty acids on the reaction, and the identity of the products.

β-KETO ACID FORMATION AND DECOMPOSITION BY PREPARATIONS OF CLOSTRIDIUM KLUYVERI