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- W2171935679 abstract "A general method for the isolation of mutants of Escherichia coli that are defective in RNA modification is described. The method is based on the fact that RNA with specific undermodifications accumulates under nonpermissive growth conditions and that such a defect can be detected by remodification either in vivo at permissive conditions or in vitro. The method provides a means by which to study mutations affecting essential modification reactions. The usefulness of the method was demonstrated by the isolation of two rRNA and two tRNA methylation defective mutants. Both rRNA mutants accept methyl groups into their 23S rRNA in vitro. Analyses of in vitro methylated 23S rRNA from one of the mutants revealed the presence of several methylated nucleosides, of which 6-methyladenosine was the most abundant (40% of recovered radioactivity). In 23S rRNA from the other mutant, the only product formed in vitro was 5-methylcytidine. The tRNA mutants are characterized in the accompanying paper." @default.
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- W2171935679 date "1978-02-01" @default.
- W2171935679 modified "2023-10-17" @default.
- W2171935679 title "General screening procedure for RNA modificationless mutants: isolation of Escherichia coli strains with specific defects in RNA methylation" @default.
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- W2171935679 doi "https://doi.org/10.1128/jb.133.2.499-507.1978" @default.
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