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Mutagenesis and repair deficiencies of Escherichia coli umuC mutants are suppressed by the plasmid pKM101

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Summary

The presence of the drug resistance plasmid pKM101 restored the ability of Escherichia coli umuC mutant strains to be mutated by methyl methanesulfonate. Inducible (Weigle) reactivation of ultravioletirradiated bacteriophage λ was not observed in uvrA6 umuC mutant strains lacking pKM101 but was observed if the plasmid was present in the strains. In a uvrA + umuC36 strain pKM101 increased the efficiency of the Weigle reactivation process. Plasmidmediated UV-resistance and plasmid-mediated phage reactivation were observed in umuC(pKM101) strains both in uvrA +and uvrA6 backgrounds. No restoration of methyl methanesulfonate mutability by pKM101 was observed in umuC36 recA56 strains. pKM101 mutants unable to enhance mutagenesis in umuC +backgrounds also had no effect on methyl methanesulfonate mutagenesis in umuC mutant strains. Neither a umuC mutation nor the presence of pKM101 affected the UV induction of protein X, the recA protein. Hypotheses relating the mode of action of pKM101 to the processes of mutagenesis and inducible phage reactivation are discussed.

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Abbreviations

UV:

ultraviolet

MMS:

methyl methanesulfonate

W:

Weigle

PMR:

plasmid-mediated reactivation

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Authors and Affiliations

  1. Biology Department, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA

    Graham C. Walker & Patricia P. Dobson

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  1. Graham C. Walker
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  2. Patricia P. Dobson
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Communicated by A.J. Clark

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Walker, G.C., Dobson, P.P. Mutagenesis and repair deficiencies of Escherichia coli umuC mutants are suppressed by the plasmid pKM101. Molec. Gen. Genet. 172, 17–24 (1979). https://doi.org/10.1007/BF00276210

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  • DOI: https://doi.org/10.1007/BF00276210

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