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Initial-velocity kinetics of succinoyl-coenzyme A-3-oxo acid coenzyme A-transferase from sheep kidney.


ABSTRACT: The initial-velocity kinetics of sheep kidney CoA-transferase are consistent with a Ping Pong mechanism. A KAcAc-CoA of 2.7 X 10(-5) M, KSucc-CoA of 1.6 X 10(-4) M, KSucc of 5.6 X 10(-3) M and KAcAc of 6.7 X 10(-5) M were determined by using a direct assay system that monitors the concentration of magnesium acetoacetyl-CoA enolate. However, product-inhibition kinetics of sheep kidney CoA-transferase are inconsistent with a Ping Pong mechanism. The possible involvement of separate binding sites for succinate and acetoacetate are discussed.

PROVIDER: S-EPMC1152106 | BioStudies | 1983-01-01

REPOSITORIES: biostudies

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