The Escherichia Coli Mutant Requiring D-glutamic Acid is the Result of Mutations in Two Distinct Genetic Loci

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1993 Jan 1

PMID 8093236

Citations 18

Authors

T J Dougherty

J A Thanassi

M J Pucci

Affiliations

Soon will be listed here.

Abstract

D-Glutamic acid is an essential component of bacterial cell wall peptidoglycan in both gram-positive and gram-negative bacteria. Very little is known concerning the genetics and biochemistry of D-glutamate production in most bacteria, including Escherichia coli. Evidence is presented in this report for the roles of two distinct genes in E. coli WM335, a strain which is auxotrophic for D-glutamate. The first gene, which restores D-glutamate independence in WM335, was mapped, cloned, and sequenced. This gene, designated dga, is a previously reported open reading frame, located at 89.8 min on the E. coli map. The second gene, gltS, is located at 82 min. gltS encodes a protein that is involved in the transport of D- and L-glutamic acid into E. coli, and the gltS gene of WM335 was found to contain two missense mutations. To construct D-glutamate auxotrophs, it is necessary to transfer sequentially the mutated gltS locus, and then the mutated dga locus into the recipient. The sequences of the mutant forms of both dga and gltS are also presented.

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