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. 1995 Nov 11;23(21):4275–4282. doi: 10.1093/nar/23.21.4275

A mutant HpaII methyltransferase functions as a mutator enzyme.

J C Shen 1, J M Zingg 1, A S Yang 1, C Schmutte 1, P A Jones 1
PMCID: PMC307380  PMID: 7501446

Abstract

DNA (cytosine-5)-methyltransferases can cause deamination of cytosine when the cofactor S-adenosylmethionine (AdoMet) is limiting and thus function as sequence-specific C-->U mutator enzymes. Here we explored whether mutations causing inactivation of the cofactor binding activity of the HpaII methyltransferase, thus mimicking conditions of limiting AdoMet concentration, could convert a DNA methyltransferase to a C-->U mutator enzyme. We created two mutator enzymes from the HpaII methyltransferase (F38S and G40D) which both showed enhanced cytosine deamination activities in vitro and in vivo. Interestingly, the G:U mispairs generated by these enzymes were not repaired completely in bacteria equipped with uracil-DNA glycosylase-initiated repair machinery, giving rise to a potent mutator phenotype. This is the first report showing the creation of mutator enzymes from a DNA methyltransferase and the demonstration of their mutagenicity in living cells.

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