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. 1979 Feb;137(2):830–838. doi: 10.1128/jb.137.2.830-838.1979

Effect of host lex, recA, recF, and uvrD genotypes on the ultraviolet light-protecting and related properties of plasmid R46 in Escherichia coli.

N S Waleh, B A Stocker
PMCID: PMC218364  PMID: 370103

Abstract

The ability of plasmid R46 to reduce the lethal but enhance the mutagenic effect of ultraviolet (UV) irradiation was tested in sets of Escherichia coli K-12 derivatives, wild type or with different mutations affecting DNA repair capacity, but otherwise isogenic. UV protection and enhancement of UV mutagenic effect were obtained in uvrA6, uvrB5, uvrD3, and recF143 hosts, but not in a recA56 strain. The plasmid gave some UV protection in two lexA1 and two lexA101 strains and in one lexA102 host, but produced no such effect in another lexA102 host. The plasmid restored UV mutagenic effect in a lexB30 strain, the yield of induced mutants per survivor of irradiation (10 J/m2) being about the same for the lexB30(R46) and lex+(R46) strains; by contrast the plasmid, though it reduced the UV sensitivity of the lexB30 strain, did not make it as UV-resistant as the lex+ R-strain.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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