Small nucleolar RNA U2-19

Small nucleolar RNA U2-19

Small nucleolar RNA U2-19 is a non-coding RNA (ncRNA) molecule which functions in the modification of other small nuclear RNAs (snRNAs). This type of modifiying RNA is usually located in the nucleolus of the eukaryotic cell which is a major site of snRNA biogenesis. It is known as a small nucleolar RNA (snoRNA) and also often referred to as a guide RNA.snoRNA U2-19 belongs to the C/D box class of snoRNAs which contain the conserved sequence motifs known as the C box (UGAUGA) and the D box (CUGA). Most of the members of the box C/D family function in directing site-specific 2'-O-methylation of substrate RNAs [cite journal | last = Galardi | first = S | coauthors = Fatica A, Bachi A, Scaloni A, Presutti C, Bozzoni I | year = 2002 | title = Purified box C/D snoRNPs are able to reproduce site-specific 2'-O-methylation of target RNA in vitro | journal = Mol Cell Biol | volume = 22 | pages = 6663–6668 | pmid = 12215523 | doi = 10.1128/MCB.22.19.6663-6668.2002] . snoRNA U2-19 directs 2'-O-methylation of U2 spliceosomal RNA G-19. [cite journal | last = Tycowski | first = KT | coauthors = Aab A, Steitz JA | year = 2004 | title = Guide RNAs with 5' Caps and Novel Box C/D snoRNA-like Domains for Modification of snRNAs in Metazoa | journal = Curr Biol | volume = 14 | pages = 1985–1995 | pmid = 15556860 | doi = 10.1016/j.cub.2004.11.003] .

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