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Burchall , J. J. (University of Illinois, Urbana), R. A.Niederman, and M. J. Wolin . Amino group formation and glutamate synthesis inStreptococcus bovis . J. Bacteriol.88: 1038–1044. 1964.—Extracts ofStreptococcus bovis grown on NH4 + as a nitrogen source contain a nicotinamide adenine dinucleotide phosphate (NADP)-linked glutamic dehydrogenase and are devoid of alanine dehydrogenase, other amino acid dehydrohygenases, and aspartase. A potential source of reduced nicotinamide adenine dinucleotide phosphate for glutamate synthesis is a NADP and nicotinamide adenine dinucleotide (NAD)-linked glyceraldehyde-3-phosphate dehydrogenase present in the extracts. Experiments with C14 -labeled glucose and NaHCO3 indicate that the glutamate carbon skeleton is synthesized by a tricarboxylic acid pathway. The synthesis of the carbon skeleton of glutamate is repressed when glutamate or casein hydrolysate supplement the NH4 + -containing growth medium. Repression of glutamic dehydrogenase and a NAD-linked isocitric dehydrogenase occurs only when complex nitrogen sources, but not when free amino acids, are added to the growth medium.

AMINO GROUP FORMATION AND GLUTAMATE SYNTHESIS INSTREPTOCOCCUS BOVIS