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. 1989 Jan;171(1):99–103. doi: 10.1128/jb.171.1.99-103.1989

Altered induction of the adaptive response to alkylation damage in Escherichia coli recF mutants.

M R Volkert 1
PMCID: PMC209560  PMID: 2536670

Abstract

Escherichia coli recF mutants are hypermutable when treated with methyl methanesulfonate (G. C. Walker, Mol. Gen. Genet. 152:93-103, 1977). In this study, methylation hypermutability of recF mutant strains was examined, and it was found that recF+ is required for normal induction of the adaptive response to alkylation damage. Although this regulatory effect of recF mutations results in reduced levels of enzymes that specifically repair methyl lesions in DNA, it only partially explains the hypermutability. Further examination showed that methylation hypermutability of recF mutant strains required a functional umuDC operon, a component of the SOS response. These results lead to the hypothesis that methylation hypermutability results from the effects of recF mutations on the induction of both the SOS response and the adaptive response.

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Selected References

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