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• W2046304818 endingPage "4675" @default.
• W2046304818 startingPage "4669" @default.
• W2046304818 abstract "Low rates of spontaneous G:C→C:G transversions would be achieved not only by the correction of base mismatches during DNA replication but also by the prevention and removal of oxidative base damage in DNA. Escherichia coli must have several pathways to repair such mismatches and DNA modifications. In this study, we attempted to identify mutator loci leading to G:C→C:G transversions in E.coli. The strain CC103 carrying a specific mutation in lacZ was mutagenized by random miniTn 10 insertion mutagenesis. In this strain, only the G:C→C:G change can revert the glutamic acid at codon 461, which is essential for sufficient β-galactosidase activity to allow growth on lactose. Mutator strains were detected as colonies with significantly increased rates of papillae formation on glucose minimal plates containing P-Gal and X-Gal. We screened ∼40 000 colonies and selected several mutator strains. The strain GC39 showed the highest mutation rate to Lac+. The gene responsible for the mutator phenotypes, mut39, was mapped at around 67 min on the E.coli chromosome. The sequencing of the miniTn10-flanking DNA region revealed that the mut39 was identical to the mutY gene of E.coli. The plasmid carrying the mutY+ gene reduced spontaneous G:C→T:A and G:C→C:G mutations in both mutY and mut39 strains. Purified MutY protein bound to the oligonucleotides containing 7,8-dihydro-8-oxo-guanine (8-oxoG):G and 8-oxoG:A. Furthermore, we found that the MutY protein had a DNA glycosylase activity which removes unmodified guanine from the 8-oxoG:G mispair. These results demonstrate that the MutY protein prevents the generation of G:C→C:G transversions by removing guanine from the 8-oxoG:G mispair in E.coli." @default.
• W2046304818 created "2016-06-24" @default.
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• W2046304818 date "1998-10-01" @default.
• W2046304818 modified "2023-09-24" @default.
• W2046304818 title "Escherichia coli MutY protein has a guanine-DNA glycosylase that acts on 7,8-dihydro-8-oxoguanine:guanine mispair to prevent spontaneous G:C->C:G transversions" @default.
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• W2046304818 doi "https://doi.org/10.1093/nar/26.20.4669" @default.
• W2046304818 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/147911" @default.
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