PMID:352805

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Citation

Shakulov, RS, Livshits, VA, Zaigraeva, GG, Lideman, LF and Mukhamed'ianova, TD (1978) [Partial suppression of the effect of gene re1A in Fusr-mutant Escherichia coli K-12 cells]. Genetika 14:890-9

Abstract

Mutants of Escherichia coli K-12 re1A+-strain CP 78 resistant to fusidic acid (Fusr) were isolated and forms sensitive to high concentration of leucine (500 g/ml) were selected. When shifted down from nutrient broth to minimal medium M9 with supplemented glucose and required amino acids, these leucine-sensitive mutants continued RNA synthesis and demonstrated the prolonged lag-phase in contrast to the parent strain CP 78. Both properties are known to be characteristic of the Rel- strains. At the same time withdrawal of the required amino acids results in cessation of RNA synthesis in Fusr mutants, in the parent Rel+ strain. Thus, leucine-sensitive Fusr mutants show Rel- phenotype only upon amino acid starvation caused by shift down from nutrient broth to minimal medium.

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Keywords

Adaptation, Physiological; Bacterial Proteins/biosynthesis; Drug Resistance, Microbial; Escherichia coli/drug effects; Escherichia coli/genetics; Fusidic Acid/pharmacology; Genes; Leucine/pharmacology; Mutation; RNA, Bacterial/biosynthesis



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