PMID:1987114

Citation	Piekarowicz, A, Yuan, R and Stein, DC (1991) Isolation of temperature-sensitive McrA and McrB mutations and complementation analysis of the McrBC region of Escherichia coli K-12. J. Bacteriol. 173:150-5
Abstract	We isolated temperature-sensitive mcrA and mcrBC mutants of Escherichia coli. At 42 degrees C, they were unable to restrict the T-even bacteriophages T6gt and T4gt or plasmids encoding cloned DNA methylase genes whose specificities confer sensitivity to the McrA and McrBC nucleases. Complementation analysis of the McrBC region (mcrB251) with the complete cloned McrBC system or a derivative with mcrB alone indicated that the mutation shows an absolute defect for the restriction of DNA containing hydroxymethylcytosine and a thermosensitive defect for the restriction of DNA containing methylcytosine. The properties of the McrA temperature-sensitive mutants suggest that some of these mutations can also influence the restriction of DNA containing hydroxymethylcytosine or methylcytosine residues.
Links	PubMed PMC207168
Keywords	Chromosomes, Bacterial; DNA Restriction Enzymes; Escherichia coli/drug effects; Escherichia coli/genetics; Escherichia coli/growth & development; Genetic Complementation Test; Genotype; Mutagenesis; Mutation; Nitrosoguanidines/pharmacology; Phenotype; Plasmids; Restriction Mapping; Temperature
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