Summary
Several chimeric pBR322/328 derivatives containing genes for cytosine-specific DNA methyltransferases (Mtases) can be transformed into the Escherichia coli K12/E. coli B hybrid strains HB101 and RR1 but not into other commonly used E. coli K12 strains. In vitro methylation of cytosine residues in pBR328 and other unrelated plasmids also reduces their potential to transform such methylation sensitive strains, albeit to a lesser degree than observed with plasmids containing Mtase genes. The extent of reduced transformability depends on the target specificity of the enzyme used for in vitro modification. The role of a host function in the discrimination against methylated plasmids was verified by the isolation of K12 mutants which tolerate cytosine methylated DNA. The mutations map in the vicinity of the serB locus. This and other data indicate that the host rglB function is involved in the discrimination against modified DNA.
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Communicated by J.W. Lengeler
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Noyer-Weidner, M., Diaz, R. & Reiners, L. Cytosine-specific DNA modification interferes with plasmid establishment in Escherichia coli K12: Involvement of rglB. Mol Gen Genet 205, 469–475 (1986). https://doi.org/10.1007/BF00338084
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DOI: https://doi.org/10.1007/BF00338084