Small nucleolar RNA SNORD82

snoRNA U82 (also known as SNORD82 or Z25) 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 SNORD82
Predicted secondary structure and sequence conservation of SNORD82
Identifiers
SymbolSNORD82
Alt. SymbolsU82
RfamRF00158
Other data
RNA typeGene; snRNA; snoRNA; C/D-box
Domain(s)Eukaryota
GO0006396 0005730
SO0000593
PDB structuresPDBe

snoRNA U82/Z25 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]

snoRNA U82 has been identified in both humans and mice:[2] it is located in the fifth intron of the nucleolin gene in both species. Two additional snoRNAs (C/D box snoRNA U20 and the H/ACA snoRNA U23 ) are also encoded within the introns of the nucleolin gene.[3]

U82 is predicted to guide the 2'O-ribose methylation of 18S ribosomal RNA (rRNA) residue A1678.[3]

Another, different snoRNA, named U82 has been predicted in the introns of L3 ribosomal protein gene (RPL3) in humans and cows.[4] However, the expression of this snoRNA could not be confirmed by northern blotting or Reverse transcription polymerase chain reaction (RT-PCR) and it should not be confused with this snoRNA located in the nucleolin gene.

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. Rebane A, Metspalu A (September 1999). "U82, a novel snoRNA identified from the fifth intron of human and mouse nucleolin gene". Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression. 1446 (3): 426–30. doi:10.1016/S0167-4781(99)00093-7. PMID 10524220.
  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. Duga S, Asselta R, Malcovati M, Tenchini ML, Ronchi S, Simonic T (February 2000). "The intron-containing L3 ribosomal protein gene (RPL3): sequence analysis and identification of U43 and of two novel intronic small nucleolar RNAs". Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression. 1490 (3): 225–36. doi:10.1016/S0167-4781(99)00237-7. PMID 10684968.
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