Reaction catalyzed by methyltransferase cap1 (2.1.1.57)

		+		a 5\'-(N7-methyl 5\'-triphosphoguanosine)-(ribonucleotide)-[mRNA]	=			+		a 5\'-(N7-methyl 5\'-triphosphoguanosine)-(2\'-O-methyl-ribonucleotide)-[mRNA]
	S-adenosyl-L-methionine	+		a 5'-(N7-methyl 5'-triphosphoguanosine)-(ribonucleotide)-[mRNA]	=		S-adenosyl-L-homocysteine	+		a 5'-(N7-methyl 5'-triphosphoguanosine)-(2'-O-methyl-ribonucleotide)-[mRNA]