Aug 1, 1976

The regulation of glutamine transport and glutamine synthetase in Salmonella typhimurium

Journal of General Microbiology
P R Betteridge, P D Ayling

Abstract

Transport of glutamine by the high-affinity transport system is regulated by the nitrogen status of the medium. With high concentrations of ammonia, transport is repressed; whereas with Casamino acids, transport is elevated, showing behaviour similar to glutamine synthetase. A glutamine auxotroph, lacking glutamine synthetase activity, had elevated transport activity even in the presence of high concentrations of ammonia (and glutamine). This suggests that glutamine synthetase is involved in the regulation of the transport system. A mutant with low glutamate synthase activity had low glutamine transport and glutamine synthetase activities, which could not be derepressed. A mutant in the high-affinity glutamine transport system showed normal regulation of glutamate synthase and glutamine synthetase. Possible mechanisms for this regulation are discussed.

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Mentioned in this Paper

Regulation of Glutamine Transport
GLUL
Glutamate-ammonia Ligase Activity
Glutamate-Ammonia Ligase
GLUL gene
Glutamate Synthase Activity
Blood Ammonia Measurement
Ammonia Inhalants
Mutant
Glutamine Transport

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