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- W2000784227 abstract "The Gram-negative bacterium Rhizobium meliloti contains two distinct malic enzymes. We report the purification of the two isozymes to homogeneity, and their in vitro characterization. Both enzymes exhibit unusually high subunit molecular weights of about 82 kDa. The NAD(P)+ specific malic enzyme [EC 1.1.1.39] exhibits positive co-operativity with respect to malate, but Michaelis-Menten type behavior with respect to the co-factors NAD+ or NADP+. The enzyme is subject to substrate inhibition, and shows allosteric regulation by acetyl-CoA, an effect that has so far only been described for some NADP+ dependent malic enzymes. Its activity is positively regulated by succinate and fumarate. In contrast to the NAD(P)+ specific malic enzyme, the NADP+ dependent malic enzyme [EC 1.1.1.40] shows Michaelis-Menten type behavior with respect to malate and NADP+. Apart from product inhibition, the enzyme is not subjected to any regulatory mechanism. Neither reductive carboxylation of pyruvate, nor decarboxylation of oxaloacetate, could be detected for either malic enzyme. Our characterization of the two R. meliloti malic enzymes therefore suggests a number of features uncharacteristic for malic enzymes described so far." @default.
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- W2000784227 date "1999-07-01" @default.
- W2000784227 modified "2023-10-15" @default.
- W2000784227 title "Characterization of two members of a novel malic enzyme class" @default.
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- W2000784227 doi "https://doi.org/10.1016/s0167-4838(99)00112-0" @default.
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