part_of part of part of RNA methyltransferase activity S-adenosylmethionine-dependent methyltransferase activity 7-methylguanosine cap hypermethylation RNA cap trimethylguanosine synthase activity A 2,2,7-trimethylguanosine (TMG) cap is found on many RNA polymerase II transcribed small noncoding RNAs including small nuclear RNA (snRNA), small nucleolar RNA (snoRNA) and telomerase RNA. It is also found on nematode mRNAs that undergo trans-splicing of a 5'-capped leader sequence. RHEA:78507 mah 2009-11-19T03:23:20Z RHEA:78479 Catalysis of two successive methyl transfer reactions from AdoMet to the N-2 atom of guanosine, thereby converting 7-methylguanosine in an RNA cap to 2,2,7 trimethylguanosine. RNA trimethylguanosine synthase activity GO:0071164 cap hypermethylase activity molecular_function snRNA methyltransferase activity RHEA:78471 small nuclear RNA methyltransferase activity RHEA:78475