Small nucleolar RNA SNORA46

In molecular biology, Small nucleolar RNA SNORA46 (also known as ACA46) is a non-coding RNA (ncRNA) molecule which functions in the biogenesis (modification) of other small nuclear RNAs (snRNAs). This type of modifying RNA is 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'. ACA46 was originally cloned from HeLa cells [1] and belongs to the H/ACA box class of snoRNAs as it has the predicted hairpin-hinge-hairpin-tail structure, has the conserved H/ACA-box motifs and is found associated with GAR1 protein. snoRNA ACA46 is predicted to guide the pseudouridylation of U649 of 18S ribosomal RNA (rRNA). Pseudouridylation is the isomerisation of the nucleoside uridine to the different isomeric form pseudouridine.

Small nucleolar RNA SNORA46
Predicted secondary structure and sequence conservation of SNORA46
Identifiers
SymbolSNORA46
Alt. SymbolssnoACA46
RfamRF00404
Other data
RNA typeGene; snRNA; snoRNA; HACA-box
Domain(s)Eukaryota
GOGO:0006396 GO:0005730
SOSO:0000594
PDB structuresPDBe

References
  1. Kiss AM, Jády BE, Bertrand E, Kiss T (July 2004). "Human box H/ACA pseudouridylation guide RNA machinery". Molecular and Cellular Biology. 24 (13): 5797–807. doi:10.1128/MCB.24.13.5797-5807.2004. PMC 480876. PMID 15199136.
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