Small nucleolar RNA SNORD46

snoRNA U46 (also known as SNORD46) is a non-coding RNA (ncRNA) molecule which functions in the modification of other small nuclear RNAs (snRNAs). This type of modifying 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.

Small nucleolar RNA SNORD46
Identifiers
SymbolSNORD46
Alt. SymbolsU40
RfamRF00218
Other data
RNA typeGene; snRNA; snoRNA; C/D-box
Domain(s)Eukaryota
GOGO:0006396 GO:0005730
SOSO:0000593
PDB structuresPDBe

snoRNA U46 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.[1]

U46 is encoded in intron 2 of the ribosomal protein S8 gene in human, and is hypothesised to guide methylation of 2'-O-ribose residues on 28S ribosomal RNA (rRNA).[2][3] The homologue of this snoRNA in Arabidopsis thaliana is called snoZ153.[4] Some human U40 sequences have been annotated in the sequence databases (Genbank) as U46.

References
  1. Galardi S, Fatica A, Bachi A, Scaloni A, Presutti C, Bozzoni I (October 2002). "Purified box C/D snoRNPs are able to reproduce site-specific 2'-O-methylation of target RNA in vitro". Molecular and Cellular Biology. 22 (19): 6663–8. doi:10.1128/MCB.22.19.6663-6668.2002. PMC 134041. PMID 12215523.
  2. Nicoloso M, Qu LH, Michot B, Bachellerie JP (July 1996). "Intron-encoded, antisense small nucleolar RNAs: the characterization of nine novel species points to their direct role as guides for the 2'-O-ribose methylation of rRNAs". Journal of Molecular Biology. 260 (2): 178–95. doi:10.1006/jmbi.1996.0391. PMID 8764399.
  3. Lestrade L, Weber MJ (January 2006). "snoRNA-LBME-db, a comprehensive database of human H/ACA and C/D box snoRNAs". Nucleic Acids Research. 34 (Database issue): D158-62. CiteSeerX 10.1.1.105.7552. doi:10.1093/nar/gkj002. PMC 1347365. PMID 16381836.
  4. Chen CL, Liang D, Zhou H, Zhuo M, Chen YQ, Qu LH (May 2003). "The high diversity of snoRNAs in plants: identification and comparative study of 120 snoRNA genes from Oryza sativa". Nucleic Acids Research. 31 (10): 2601–13. doi:10.1093/nar/gkg373. PMC 156054. PMID 12736310.
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