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Cell Wall Peptidoglycan Mutants of Escherichia Coli K-12: Existence of Two Clusters of Genes, Mra and Mrb, for Cell Wall Peptidoglycan Biosynthesis

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Journal J Bacteriol
Specialty Microbiology
Date 1972 Nov 1
PMID 4563986
Citations 50
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Abstract

Temperature-sensitive mutants of Escherichia coli K-12 which cannot form cell wall peptidoglycan at 42 C were isolated. The thermosensitive steps were characterized biochemically, and the genes coding the enzymes of peptidoglycan synthesis were mapped. These genes were in two clusters: one group, located at about 1.5 min between leu and azi, was designated as mra (murein a); the second group, located at about 77.5 min close to argH and metB, was designated as mrb (murein b, with the order metB-argH-mrb). No simple relations were found between the gene location and the order or localization of enzymes involved in the sequence of reactions of cell wall peptidoglycan biosynthesis.

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