Reference: Kresze GB, et al. (1977) Reaction of yeast fatty acid synthetase with iodoacetamide. 3. Malonyl-coenzyme A decarboxylase as product of the reaction of fatty acid synthetase with iodoacetamide. Eur J Biochem 79(1):191-9

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Abstract


Yeast fatty acid synthetase possesses very low malonyl-CoA decarboxylase activity. Treatment with iodoacetamide, while abolishing synthetase activity, induces a strong malonyl decarboxylase activity which, in turn, can be inhibited by N-ethylmaleimide. Kinetic analysis shows that the emergence of the decarboxylase activity is synchronized to the disappearance of the fatty-acid-synthesizing activity and thus, is due to carboxamidomethylation of the peripheral SH-groups of the multienzyme complex. Strong decarboxylase activity was also found after treatment of the synthetase with methylmalonyl-CoA. A hypothetical scheme is proposed which explains the origination of the decarboxylase activity as a consequence of conformational changes of the condensing enzyme component which happen when the peripheral SH-group is acylated or alkylated.

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Journal Article
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Kresze GB, Steber L, Oesterhelt D, Lynen F
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