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Intracellular concentrations of adenine nucleotides and intermediates of the Embden-Meyerhof pathway and the tricarboxylic acid cycle have been determined during growth and sporulation of Bacillus licheniformis in a variety of different media. The ATP pool was independent of growth rate and nitrogen source, but the use of glucose as a carbon source resulted in a twofold elevation in the ATP pool during exponential growth. The intracellular phosphoenolpyruvate pool was at least twofold higher during gluconeogenesis than during glycolysis. The finding that the use of glutamate as the sole nitrogen source resulted in at least a fivefold elevation of the alpha-ketoglutarate pool suggests a role for alpha-ketoglutarate in the repression of the enzymes of the tricarboxylic acid cycle responsible for alpha-ketoglutarate synthesis. Not one of the metabolites assayed appears to function as a signal of the nutrient deprivation which accompanies the initiation of sporulation.

Effect of cultural conditions on the concentrations of metabolic intermediates during growth and sporulation of Bacillus licheniformis