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Title: Role of glutamate dehydrogenase in ammonia assimilation in nitrogen-fixing Bacillus macerans. Author: Kanamori K, Weiss RL, Roberts JD. Journal: J Bacteriol; 1987 Oct; 169(10):4692-5. PubMed ID: 2888750. Abstract: Pathways of ammonia assimilation into glutamic acid in Bacillus macerans were investigated by measurements of the specific activities of glutamate dehydrogenase (GDH), glutamine synthetase, and glutamate synthase. In ammonia-rich medium, GDH was the predominant pathway of ammonia assimilation. In nitrogen-fixing cells in which the intracellular NH4+ concentration was 1.4 +/- 0.5 mM, the activity of GDH with a Km of 2.2 mM for NH4+ was found to be severalfold higher than that of glutamate synthase. The result suggests that GDH plays a significant role in the assimilation of NH4+ in N2-fixing B. macerans.[Abstract] [Full Text] [Related] [New Search]