5nrl

From Proteopedia

Structure of a pre-catalytic spliceosome

Structural highlights

5nrl is a 10 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 7.2Å
Ligands:
Experimental data:	Check to display Experimental Data
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

BRR2_YEAST RNA helicase that plays an essential role in pre-mRNA splicing as component of the U5 snRNP and U4/U6-U5 tri-snRNP complexes. Involved in spliceosome assembly, activation and disassembly. Mediates changes in the dynamic network of RNA-RNA interactions in the spliceosome. Catalyzes the ATP-dependent unwinding of U4/U6 RNA duplices, an essential step in the assembly of a catalytically active spliceosome.^[1] ^[2] ^[3] ^[4]

Publication Abstract from PubMed

Intron removal requires assembly of the spliceosome on precursor mRNA (pre-mRNA) and extensive remodelling to form the spliceosome's catalytic centre. Here we report the cryo-electron microscopy structure of the yeast Saccharomyces cerevisiae pre-catalytic B complex spliceosome at near-atomic resolution. The mobile U2 small nuclear ribonucleoprotein particle (snRNP) associates with U4/U6.U5 tri-snRNP through the U2/U6 helix II and an interface between U4/U6 di-snRNP and the U2 snRNP SF3b-containing domain, which also transiently contacts the helicase Brr2. The 3' region of the U2 snRNP is flexibly attached to the SF3b-containing domain and protrudes over the concave surface of tri-snRNP, where the U1 snRNP may reside before its release from the pre-mRNA 5' splice site. The U6 ACAGAGA sequence forms a hairpin that weakly tethers the 5' splice site. The B complex proteins Prp38, Snu23 and Spp381 bind the Prp8 N-terminal domain and stabilize U6 ACAGAGA stem-pre-mRNA and Brr2-U4 small nuclear RNA interactions. These results provide important insights into the events leading to active site formation.

Structure of a pre-catalytic spliceosome.,Plaschka C, Lin PC, Nagai K Nature. 2017 Jun 29;546(7660):617-621. doi: 10.1038/nature22799. Epub 2017 May, 22. PMID:28530653^[5]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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Citations

reviews cite this structure

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References

↑ Maeder C, Kutach AK, Guthrie C. ATP-dependent unwinding of U4/U6 snRNAs by the Brr2 helicase requires the C terminus of Prp8. Nat Struct Mol Biol. 2009 Jan;16(1):42-8. doi: 10.1038/nsmb.1535. Epub 2008 Dec, 21. PMID:19098916 doi:http://dx.doi.org/10.1038/nsmb.1535
↑ Hahn D, Kudla G, Tollervey D, Beggs JD. Brr2p-mediated conformational rearrangements in the spliceosome during activation and substrate repositioning. Genes Dev. 2012 Nov 1;26(21):2408-21. doi: 10.1101/gad.199307.112. PMID:23124065 doi:http://dx.doi.org/10.1101/gad.199307.112
↑ Pena V, Jovin SM, Fabrizio P, Orlowski J, Bujnicki JM, Luhrmann R, Wahl MC. Common design principles in the spliceosomal RNA helicase Brr2 and in the Hel308 DNA helicase. Mol Cell. 2009 Aug 28;35(4):454-66. PMID:19716790 doi:10.1016/j.molcel.2009.08.006
↑ Zhang L, Xu T, Maeder C, Bud LO, Shanks J, Nix J, Guthrie C, Pleiss JA, Zhao R. Structural evidence for consecutive Hel308-like modules in the spliceosomal ATPase Brr2. Nat Struct Mol Biol. 2009 Jul;16(7):731-9. Epub 2009 Jun 14. PMID:19525970 doi:10.1038/nsmb.1625
↑ Plaschka C, Lin PC, Nagai K. Structure of a pre-catalytic spliceosome. Nature. 2017 Jun 29;546(7660):617-621. doi: 10.1038/nature22799. Epub 2017 May, 22. PMID:28530653 doi:http://dx.doi.org/10.1038/nature22799