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Temperature-sensitive mutants ofEscherichia 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 betweenleu andazi , was designated asmra (murein a); the second group, located at about 77.5 min close toargH andmetB , was designated asmrb (murein b, with the ordermetB-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.

journal of bacteriology

Cell Wall Peptidoglycan Mutants of Escherichia coli K-12: Existence of Two Clusters of Genes, mra and mrb , for Cell Wall Peptidoglycan Biosynthesis