6j6q

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Cryo-EM structure of the yeast B*-b2 complex at an average resolution of 3.7 angstrom

Structural highlights

6j6q is a 10 chain structure with sequence from Saccharomyces cerevisiae S288C. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Electron Microscopy, Resolution 3.7Å
Experimental data:Check to display Experimental Data
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

PRP8_YEAST Required for pre-spliceosome formation, which is the first step of pre-mRNA splicing. This protein is associated with snRNP U5. Has a role in branch site-3' splice site selection. Associates with the branch site-3' splice 3'-exon region. Also has a role in cell cycle.[1] [2] [3] [4]

Publication Abstract from PubMed

Pre-mRNA splicing is executed by the spliceosome. Structural characterization of the catalytically activated complex (B( *)) is pivotal for understanding the branching reaction. In this study, we assembled the B( *) complexes on two different pre-mRNAs from Saccharomyces cerevisiae and determined the cryo-EM structures of four distinct B( *) complexes at overall resolutions of 2.9-3.8 A. The duplex between U2 small nuclear RNA (snRNA) and the branch point sequence (BPS) is discretely away from the 5'-splice site (5'SS) in the three B( *) complexes that are devoid of the step I splicing factors Yju2 and Cwc25. Recruitment of Yju2 into the active site brings the U2/BPS duplex into the vicinity of 5'SS, with the BPS nucleophile positioned 4 A away from the catalytic metal M2. This analysis reveals the functional mechanism of Yju2 and Cwc25 in branching. These structures on different pre-mRNAs reveal substrate-specific conformations of the spliceosome in a major functional state.

Structures of the Catalytically Activated Yeast Spliceosome Reveal the Mechanism of Branching.,Wan R, Bai R, Yan C, Lei J, Shi Y Cell. 2019 Apr 4;177(2):339-351.e13. doi: 10.1016/j.cell.2019.02.006. Epub 2019, Mar 14. PMID:30879786[5]

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

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See Also

References

  1. ↑ Jackson SP, Lossky M, Beggs JD. Cloning of the RNA8 gene of Saccharomyces cerevisiae, detection of the RNA8 protein, and demonstration that it is essential for nuclear pre-mRNA splicing. Mol Cell Biol. 1988 Mar;8(3):1067-75. PMID:2835658
  2. ↑ Abovich N, Rosbash M. Cross-intron bridging interactions in the yeast commitment complex are conserved in mammals. Cell. 1997 May 2;89(3):403-12. PMID:9150140
  3. ↑ McPheeters DS, Muhlenkamp P. Spatial organization of protein-RNA interactions in the branch site-3' splice site region during pre-mRNA splicing in yeast. Mol Cell Biol. 2003 Jun;23(12):4174-86. PMID:12773561
  4. ↑ Yang K, Zhang L, Xu T, Heroux A, Zhao R. Crystal structure of the beta-finger domain of Prp8 reveals analogy to ribosomal proteins. Proc Natl Acad Sci U S A. 2008 Sep 16;105(37):13817-22. Epub 2008 Sep 8. PMID:18779563
  5. ↑ Wan R, Bai R, Yan C, Lei J, Shi Y. Structures of the Catalytically Activated Yeast Spliceosome Reveal the Mechanism of Branching. Cell. 2019 Apr 4;177(2):339-351.e13. doi: 10.1016/j.cell.2019.02.006. Epub 2019, Mar 14. PMID:30879786 doi:http://dx.doi.org/10.1016/j.cell.2019.02.006

Contents


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6j6q, resolution 3.70Å

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