Genetics of the Glutamine Transport System in Escherichia Coli

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1981 Sep 1

PMID 6115851

Citations 21

Authors

P S Masters

J S Hong

Affiliations

Soon will be listed here.

Abstract

The active transport of glutamine by Escherichia coli occurs via a single osmotic shock-sensitive transport system which is known to be dependent upon a periplasmic binding protein specific for glutamine. We obtained a mutant that had elevated levels of glutamine transport and overproduced the glutamine binding protein. From this strain many point mutants and deletion-carrying strains defective in glutamine transport were isolated by a variety of techniques. The genetic locus coding for the glutamine transport system, glnP, and the regulatory mutation which causes overproduction of the transport system were both shown to map at 17.7 min on the E. coli chromosome, and it was demonstrated that the glnP locus contains the structural gene for the glutamine binding protein. Evidence was also obtained that the glutamine transport system, by an unknown mechanism, plays a direct role in the catabolism of glutamate and, hence, of glutamine and proline as well.

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