methyltransferase cap1 activity
Catalysis of the reaction: a 5'-end (N(7)-methyl 5'-triphosphoguanosine)-ribonucleoside in mRNA or snRNA + S-adenosyl-L-methionine = a 5'-end (N(7)-methyl 5'-triphosphoguanosine)-(2'-O-methyl-ribonucleoside) in mRNA or snRNA + S-adenosyl-L-homocysteine + H+. This activity catalyzes the methylation of the ribose on the first transcribed nucleotide of mRNAs and snRNAs.
GO:0008171
O-methyltransferase activity
is_a
GO:0008173
RNA methyltransferase activity
is_a
S-adenosyl-L-methionine:mRNA (nucleoside-2'-O-)-methyltransferase activity
related
mRNA (adenosine-2'-O-)-methyltransferase activity
related
mRNA (nucleoside-2'-O-)-methyltransferase activity
related
messenger RNA (nucleoside-2'-)-methyltransferase activity
related
messenger ribonucleate nucleoside 2'-methyltransferase activity
related