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A mutant of Saccharomyces cerevisiae lacking aconitase did not grow on minimal medium (MM) and had five- to tenfold less NADP+-dependent glutamate dehydrogenase (GDH) activity than the wild-type, although its glutamine synthetase (GS) activity was still inducible. When this mutant was incubated with glutamate as the sole nitrogen source, the 2-oxoglutarate content rose, and the NADP+-dependent GDH activity increased. Furthermore, carbon-limited cultures showed a direct relation between NADP+-dependent GDH activity and the intracellular 2-oxoglutarate content. We propose that the low NADP+-dependent GDH activity found in the mutant was due to the lack of 2-oxoglutarate or some other intermediate of the tricarboxylic acid cycle.

NADP+-dependent Glutamate Dehydrogenase Activity is Impaired in Mutants of Saccharomyces cerevisiae That Lack Aconitase