name: 7-methylguanosine cap hypermethylation
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def: "Hypermethylation of the 7-(mono)methylguanosine (m(7)G) cap structure at the 2' position of the guanosine residue to convert a mono-methylated cap to a 2,2,7-trimethylguanosine cap structure. This type of cap modification occurs on small nuclear RNAs (snRNAs) and small nucleolar RNAs (snoRNAs) and is dependent on prior guanine-N7 methylation." [GOC:bf, GOC:BHF, GOC:krc, GOC:mah, GOC:rl, PMID:11983179, PMID:18775984]
synonym: "2,2,7-trimethylguanosine cap formation" EXACT [PMID:11983179]
synonym: "conversion of m(7)G to m(3)G" EXACT [PMID:11983179]
synonym: "hypermethylation of snoRNA cap" NARROW [GOC:bf, GOC:krc, GOC:mah]
synonym: "hypermethylation of snRNA cap" NARROW [GOC:bf, GOC:krc, GOC:mah]
synonym: "m(7)G cap hypermethylation" EXACT [GOC:bf]
synonym: "snoRNA capping" NARROW [GOC:rl]
synonym: "snRNA capping" NARROW [GOC:rl]
synonym: "TMG cap formation" EXACT [PMID:11983179]
is_a: GO:0001510 ! RNA methylation
is_a: GO:0036260 ! RNA capping
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