It has previously been suggested that the synthesis of phosphoenolpyruvate carboxykinase (EC in is regulated by a repression-derepression mechanism involving a glycolytic intermediate, and not by induction. Results obtained using compounds that enter the tricarboxylic acid cycle via 2-oxoglutarate, and that can supply both a carbon and a nitrogen source for , suggest it is more likely that the synthesis of phosphoenolpyruvate carboxykinase is inducible, and only weakly regulated by carbon catabolite repression. A similar study of the regulation of the NADP-linked malic enzyme (EC indicates that it too may be inducible.


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