U5 spliceosomal RNA
| U5 spliceosomal RNA | |
|---|---|
| File:RF00020.jpg Predicted secondary structure and sequence conservation of U5 | |
| Identifiers | |
| Symbol | U5 |
| Rfam | RF00020 |
| Other data | |
| RNA type | Gene; snRNA; splicing |
| Domain | Eukaryota |
| GO | GO:0000351 GO:0000353 GO:0005682 GO:0046540 |
| SO | SO:0000395 |
| PDB structures | PDBe |
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]
Medical relevance
[edit | edit source]Specific heterozygous variants in RNU5B-1, a gene that encodes one of the functional homologs of U5 spliceosomal RNA in humans, cause an autosomal dominant Neurodevelopmental disorder with seizures and joint laxity (OMIM 621090) also called RNU5B-1 syndrome.[7]
References
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Further reading
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