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Temperature-sensitive Mutants of Escherichia Coli K-12 with Low Activity of the Diaminopimelic Acid Adding Enzyme

Overview
Journal J Bacteriol
Publisher American Society for Microbiology
Specialty Microbiology
Date 1972 Apr 1
PMID 4553000
Citations 23
Authors
E J Lugtenberg
Affiliations
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Abstract

Five temperature-sensitive lysis mutants were found to possess very low diaminopimelic acid (Dpm) adding enzyme activity in vitro. Murein synthesis at 42 C was impaired, and uridine-5'-diphosphate-N-acetyl-muramyl-l-Ala- d-Glu (UDP-MurNAc-dipeptide) was accumulated. In the presence of NaCl, the mutants could grow at 42 C. NaCl had no influence on the Dpm adding enzyme activity in vitro. The growth rate of most temperature-resistant revertants was decreased, but their Dpm adding enzyme activity remained very low. Two revertants had a rather normal growth rate. Their Dpm adding enzyme activity was significantly increased, but much lower than in the wild type. The influence of growth rate on the viability of the mutants is discussed.

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