May play a role in cytosine methylation at palindromic 5'-CG-3' and 5'-C[ACT]G-3' sites in DNA. a 2'-deoxycytidine in DNA + ATP + H2O + S-adenosyl-L-methionine = a 5-methyl-2'-deoxycytidine in DNA + ADP + 2 H(+) + phosphate + S-adenosyl-L-homocysteine Very mildly decreases methylation of the fifth carbon of cytosine (5mC) in DNA (PubMed:33941240). No apparent cell population growth phenotype, sexual reproduction phenotype, virulence phenotype, or sensitivity to osmotic, oxidative or genotoxic stress (PubMed:33941240). In the N-terminal section; belongs to the class I-like SAM-binding methyltransferase superfamily. C5-methyltransferase family. In the C-terminal section; belongs to the SNF2/RAD54 helicase family.