Involved in CpXpG DNA methylation (By similarity). May not play a major role in maintaining CpXpG methylation (Probable). a 2'-deoxycytidine in DNA + S-adenosyl-L-methionine = a 5-methyl-2'-deoxycytidine in DNA + H(+) + S-adenosyl-L-homocysteine No visible phenotype under normal growth conditions. Belongs to the class I-like SAM-binding methyltransferase superfamily. C5-methyltransferase family.