Abstract
The propionyl-CoA carboxylase activity of crude extracts of Nocardia mediterranei fractionated by ammonium sulfate (40–60%) is described. Such an enzyme may play an important role in the biosynthesis of rifamycin as well as in the degradation of various amino acids. The effect of different compounds on the enzymatic reaction have been investigated. Product P8/1-OG and citrate inhibited the enzyme. An activation by the amino acids isoleucine, methionine, threonine and valine was found. The results do not exclude that the same enzyme is responsible for the carboxylation of acetyl-CoA and propionyl-CoA.
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