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- W2095072823 abstract "Malonyl-CoA decarboxylase was partially purified (nearly 1000-fold) from Mycobacterium tuberculosis H37Ra by ammonium sulfate precipitation, gel filtration with Sepharose 6B, and chromatography on DEAE Sephacel, carboxymethyl-Sephadex, and NADP-agarose. Polyacrylamide gel electrophoresis showed a major band (60–70%), which contained the enzymatic activity, and a minor band which had no decarboxylase activity. The molecular weight of the enzyme was 44,000, and the PI and pH optimum were 6.7 and 5.5, respectively. The enzyme showed a typical Michaelis-Menten substrate saturation, with an apparent Km and V of 0.2 mm and 3.85 μmol/min/mg, respectively. It catalyzed decarboxylation of methylmalonyl-CoA only at 5% of the rate observed with malonyl-CoA, whereas malonic acid and succinyl-CoA were not decarboxylated. Antibodies prepared against malonyl-CoA decarboxylase from the uropygial glands of goose and rat liver mitochondria did not inhibit the bacterial enzyme. Avidin did not inhibit the enzyme suggesting that biotin was not involved in the reaction. Thiol-directed reagents inhibited the enzyme as did CoA, acetyl-CoA, propionyl-CoA, methylmalonyl-CoA, and succinyl-CoA. Malonyl-CoA decarboxylase was also partially purified from malonate-grown Pseudomonas fluorescens. The molecular weight of this enzyme was 56,000 and the pH optimum and apparent Km were 5.5 and 1 mm, respectively. Unlike the mycobacterial enzyme, this enzyme was insensitive to p-hydroxymercuribenzoate, acetyl-CoA, and propionyl-CoA, and it was less sensitive to inhibition by succinyl-CoA and CoA than the mycobacterial enzyme. The size and properties of the two bacterial enzymes suggest that these are quite unlike the mammalian and avian enzymes and that they constitute a different class of malonyl-CoA decarboxylases." @default.
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- W2095072823 date "1979-09-01" @default.
- W2095072823 modified "2023-09-23" @default.
- W2095072823 title "Malonyl-CoA decarboxylase from Mycobacterium Tuberculosis and Pseudomonas fluorescence" @default.
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- W2095072823 doi "https://doi.org/10.1016/0003-9861(79)90306-0" @default.
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