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pubmed-article:1187340pubmed:abstractTextA DNA methylase has been purified 270-fold from HeLa cell nuclei by chromatography on DEAE-cellulose, phosphocellulose, and hydroxyapatite. The enzyme transfers methyl groups from S-adenosyl-L-methionine to cytosine residues in DNA. The sole product of the reaction has been identified as 5-methylcytosine. The enzyme is able to methylate homologous (HeLa) DNA, although to a lesser extent than heterologous DNA. This may be due to incomplete methylation of HeLa DNA synthesized in vivo. The HeLa enzyme can methylate single-stranded DNA, and does so to an extent three times greater than that of the corresponding double-stranded DNA. In single-stranded M. luteus DNA, at least 2.4% of the cytosine residues can be methylated in vitro by the enzyme. The enzyme also can methylate poly (dG-dC-dG-dC) and poly (dG, dC). Bilateral nearest neighbors to the 5-methylcytosine have been determined with M. luteus DNA in vitro and HeLa DNA in vivo. The 5' neighbor can be either G or C while the 3' neighbor is always G and this sequence is, thus, p(G/C)pmCpG.lld:pubmed
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