Role of the glutamine transaminase-omega-amidase pathway and glutaminase in glutamine degradation in Rhizobium etli
Article Abstract:
A study of the regulation of glutamine transaminase helps evaluate the role of glutamine transaminase-omega-amidase pathway and a glutaminase in the degradation of glutamine in Rhizobium etli. Glyoxylate and pyruvate are transaminated preferentially by glutamine transminase, with its activity being similar under all growth conditions. While glutamine exerts a positive control on glutaminase activity, the carbon source and ammonium regulate the enzyme activity negatively. Glutamine synthase utilizes the ammonium released from glutamine, resulting in an ATP-consuming, functional glutamine cycle.
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1995
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Asparagine degradation in Rhizobium etli
Article Abstract:
Rhizobium etli degrades and uses asparagine as a carbon source by the activity of asparaginase and aspartate ammonium-lyase. The activity of the enzymes is maximum when asparagine is used as a carbon and nitrogen source. The activity of asparaginase decreases in the presence of carbon sources such as glucose and is unaffected by the oxygen concentration and suppression of nitrogen catabolism. The enzymes are probably required for symbiosis between R. etli and Phaseolus vulgaris.
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1996
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The role of glutaminase in Rhizobium etli: studies with a new mutant
Article Abstract:
Rhizobium etli requires glutaminase as the sole source of carbon and nitrogen. LM16 mutants with low glutaminase activity are unable to grow on glutamine. The mutants have higher levels of glutamine and lower levels of glutamate compared to the wild-type bacteria. The excretion of ammonia and production of CO2 from glutamine is less in the mutants. Glutaminase is also involved in the symbiosis between R. etli and Phaseolus vulgaris.
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
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