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A comparative assay of nitrogen metabolism enzymes in the Yarrowia lipolytica mutant N1 grown under conditions promoting the overproduction of either alpha-ketoglutaric acid (KGA) or citric acid showed that the overproduction of KGA correlates with an increase in the activities of the NAD- and NADP-linked glutamate dehydrogenase, glutamic-pyruvic transaminase, and glutamic-oxaloacetic transaminase reactions. These reactions are likely to be responsible for the overproduction of KGA by this mutant. In contrast, the overproduction of citric acid correlated with a decline in the activities of the NAD- and NADP-linked glutamate dehydrogenases and with an increase in the activities of glutamine synthetase and glutamate synthase. |
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