U5 spliceosomal RNA

U5 snRNA is a small nuclear RNA (snRNA) that participates in RNA splicing as a component of the spliceosome. It forms the U5 snRNP (small nuclear ribonucleoprotein) by associating with several proteins including Prp8 - the largest and most conserved protein in the spliceosome, Brr2 - a helicase required for spliceosome activation, Snu114, and the 7 Sm proteins.[1] U5 snRNA forms a coaxially-stacked series of helices that project into the active site of the spliceosome.[2][3] Loop 1, which caps this series of helices, forms 4-5 base pairs with the 5'-exon during the two chemical reactions of splicing.[4][5] This interaction appears to be especially important during step two of splicing, exon ligation.[6]

U5 spliceosomal RNA
Predicted secondary structure and sequence conservation of U5
Identifiers
SymbolU5
RfamRF00020
Other data
RNA typeGene; snRNA; splicing
Domain(s)Eukaryota
GO0000351 0000353 0005682 0046540
SO0000395
PDB structuresPDBe

References
  1. Stevens SW, Barta I, Ge HY, Moore RE, Young MK, Lee TD, Abelson J (November 2001). "Biochemical and genetic analyses of the U5, U6, and U4/U6 x U5 small nuclear ribonucleoproteins from Saccharomyces cerevisiae". RNA. 7 (11): 1543–53. PMC 1370197. PMID 11720284.
  2. Nguyen TH, Galej WP, Bai XC, Savva CG, Newman AJ, Scheres SH, Nagai K (July 2015). "The architecture of the spliceosomal U4/U6.U5 tri-snRNP". Nature. 523 (7558): 47–52. doi:10.1038/nature14548. PMC 4536768. PMID 26106855.
  3. Yan C, Hang J, Wan R, Huang M, Wong CC, Shi Y (September 2015). "Structure of a yeast spliceosome at 3.6-angstrom resolution". Science. 349 (6253): 1182–91. doi:10.1126/science.aac7629. PMID 26292707.
  4. Newman AJ, Norman C (February 1992). "U5 snRNA interacts with exon sequences at 5' and 3' splice sites". Cell. 68 (4): 743–54. doi:10.1016/0092-8674(92)90149-7. PMID 1739979.
  5. Sontheimer EJ, Steitz JA (December 1993). "The U5 and U6 small nuclear RNAs as active site components of the spliceosome". Science. 262 (5142): 1989–96. doi:10.1126/science.8266094. PMID 8266094.
  6. O'Keefe RT, Norman C, Newman AJ (August 1996). "The invariant U5 snRNA loop 1 sequence is dispensable for the first catalytic step of pre-mRNA splicing in yeast". Cell. 86 (4): 679–89. doi:10.1016/s0092-8674(00)80140-3. PMID 8752221.

Further reading


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