the effect of pyrimidine photodimers on transmethylation reactions catalyzed by a highly purified rat liver dna ( cytosine-5- ) -methyltransferase ( ec 2.1.1.37 ) that exhibits maintenance and de novo methylation activities was studied in vitro , using the viral substrates m13 mp9 replicative form ( rf ) dna and the hemimethylated analog formed from primed synthesis of phage dna in the presence of 2'-deoxy-5-methylcytidine 5'-triphosphate .
C0025831
methyltransferase
C0025723
methylation