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. 1984 Feb 24;12(4):2111–2126. doi: 10.1093/nar/12.4.2111

Adaptive response of Micrococcus luteus to alkylating chemicals.

A Ather, Z Ahmed, S Riazuddin
PMCID: PMC318644  PMID: 6701095

Abstract

Wild type M. luteus cells have been adapted by a step-wise treatment with sub-lethal concentrations of MNNG. The adapted cells exhibit 5.7 fold increased resistance to the killing effects of the mutagen and a simultaneous efficient removal of various base modifications present in cellular DNA. A protein extract prepared from adapted cells contains inducible repair functions which can reduce 80-90% of the alkylated DNA content of 06-MeG is effected by a transmethylase and there is no concomitant release of the modified base. However, N-3 MeG is released as a free modified base through the action of a DNA glycosylase. The release of N-3 MeA is unaffected by the induction treatment whereas that of N-7 methylpurine is slightly improved in the adapted cells.

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Selected References

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