7ABF

Human pre-Bact-1 spliceosome core structure


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Mechanism of protein-guided folding of the active site U2/U6 RNA during spliceosome activation.

Townsend, C.Leelaram, M.N.Agafonov, D.E.Dybkov, O.Will, C.L.Bertram, K.Urlaub, H.Kastner, B.Stark, H.Luhrmann, R.

(2020) Science 370

  • DOI: https://doi.org/10.1126/science.abc3753
  • Primary Citation of Related Structures:  
    7AAV, 7ABF, 7ABG, 7ABH, 7ABI

  • PubMed Abstract: 

    Spliceosome activation involves extensive protein and RNA rearrangements that lead to formation of a catalytically active U2/U6 RNA structure. At present, little is known about the assembly pathway of the latter and the mechanism whereby proteins aid its proper folding. Here, we report the cryo-electron microscopy structures of two human, activated spliceosome precursors (that is, pre-B act complexes) at core resolutions of 3.9 and 4.2 angstroms. These structures elucidate the order of the numerous protein exchanges that occur during activation, the mutually exclusive interactions that ensure the correct order of ribonucleoprotein rearrangements needed to form the U2/U6 catalytic RNA, and the stepwise folding pathway of the latter. Structural comparisons with mature B act complexes reveal the molecular mechanism whereby a conformational change in the scaffold protein PRP8 facilitates final three-dimensional folding of the U2/U6 catalytic RNA.


  • Organizational Affiliation

    Department of Structural Dynamics, MPI for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany. reinhard.luehrmann@mpibpc.mpg.de hstark1@gwdg.de b.kastner@mpibpc.mpg.de.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein BUD31 homologA [auth Q]144Homo sapiensMutation(s): 0 
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PHAROS:  P41223
GTEx:  ENSG00000106245 
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UniProt GroupP41223
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Pre-mRNA-splicing factor 38AB [auth I]312Homo sapiensMutation(s): 0 
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Find proteins for Q8NAV1 (Homo sapiens)
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PHAROS:  Q8NAV1
GTEx:  ENSG00000134748 
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UniProt GroupQ8NAV1
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Pre-mRNA-processing-splicing factor 8C [auth A]2,335Homo sapiensMutation(s): 0 
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Find proteins for Q6P2Q9 (Homo sapiens)
Explore Q6P2Q9 
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PHAROS:  Q6P2Q9
GTEx:  ENSG00000174231 
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UniProt GroupQ6P2Q9
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
116 kDa U5 small nuclear ribonucleoprotein componentD [auth r]972Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000108883 
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Zinc finger matrin-type protein 2E [auth N]199Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000146007 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Ubiquitin-like protein 5F [auth q]73Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000198258 
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Spliceosome-associated protein CWC15 homologG [auth R]229Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000150316 
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
WW domain-binding protein 11J [auth X]641Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000084463 
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
SNW domain-containing protein 1K [auth v]536Homo sapiensMutation(s): 0 
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Find proteins for Q13573 (Homo sapiens)
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GTEx:  ENSG00000100603 
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
Pleiotropic regulator 1L [auth G]514Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000171566 
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Entity ID: 14
MoleculeChains Sequence LengthOrganismDetailsImage
Microfibrillar-associated protein 1N [auth K]439Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000140259 
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Entity ID: 15
MoleculeChains Sequence LengthOrganismDetailsImage
Transcription elongation regulator 1O [auth A4]1,077Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000113649 
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Entity ID: 8
MoleculeChains LengthOrganismImage
U5 small nuclear RNAH [auth 5]116Homo sapiens
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Entity ID: 9
MoleculeChains LengthOrganismImage
U6 small nuclear RNAI [auth 6]106Homo sapiens
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Entity ID: 13
MoleculeChains LengthOrganismImage
MINX M3 RNAM [auth Z]230synthetic construct
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.0
MODEL REFINEMENTPHENIX

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research Foundation (DFG)Germany860

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-09
    Type: Initial release
  • Version 1.1: 2020-12-30
    Changes: Database references