Immunogen sequence: PELAKYWAQR YRLFSRFDDG IKLDREGWFS VTPEKIAEHI AGRVSQSFKC DVVVDAFCGV GGNTIQFALT GMRVIAIDID PVKIALARNN AE. Catalyzes the 2 serial methylation steps for the conversion of the 7-monomethylguanosine (m(7)G) caps of snRNAs and snoRNAs to a 2,