label: mRNA 5'-cap (guanine-N7-)-methyltransferase activity
label_lc: mrna 5'-cap (guanine-n7-)-methyltransferase activity
description: "Catalysis of the reaction: S-adenosyl-L-methionine + G(5')pppR-RNA = S-adenosyl-L-homocysteine + m7G(5')pppR-RNA. m7G(5')pppR-RNA is mRNA containing an N7-methylguanine cap; R may be guanosine or adenosine."