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The Influence of Colicinogenic Plasmids ColIb-P9, ColIa-CA53 and ColV-K30 on the Repair, Mutagenesis and Induction of Colicin E1 Synthesis

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Journal Mol Gen Genet
Date 1981 Jan 1
PMID 7012544
Citations 4
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Abstract

The presence of colicinogenic plasmids ColIb-P9 and ColIa-CA53 in E. coli K-12 cells, wild-type with respect to repair, enhanced the survival of cells after UV irradiation and increased the frequency of UV-induced argE3 and his-4 reversions, while the presence of ColV-K30 negatively affected repair and mutagenesis. The plasmid ColIb-P9 showed a UV-protective effect in E. coli cells carrying mutations in genes uvrA, uvrB, uvrC, polA, recB, recF, though in none of the mutants did cell survival reach the wild-type level. The effect of ColIb-P9 on mutagenesis did not depend on the uvrA or recB genes. The plasmid's protective effect and the enhancement of mutagenesis depended on the recA+ lexA+ genotype. The frequency of 2-aminopurine-induced mutations was not affected by ColIb-P9 or ColV-K30. The presence of ColIb-P9 decreased the ability of ColE1-carrying cells to induce colicin E1 synthesis caused by DNA-damaging agents: UV, MNNG, mitomycin C, whereas ColV-K30 increased the percentage of colicin E1-producing cells. These plasmid effects on the level of induction of colicin E1 synthesis were not observed in the case of induction caused by chloramphenicol which did not depend on the products of recA and lexA genes.

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