7Q4O

Substrate-bound A-like U2 snRNP


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Structural basis of branch site recognition by the human spliceosome.

Tholen, J.Razew, M.Weis, F.Galej, W.P.

(2022) Science 375: 50-57

  • DOI: https://doi.org/10.1126/science.abm4245
  • Primary Citation of Related Structures:  
    7Q3L, 7Q4O, 7Q4P

  • PubMed Abstract: 

    Recognition of the intron branch site (BS) by the U2 small nuclear ribonucleoprotein (snRNP) is a critical event during spliceosome assembly. In mammals, BS sequences are poorly conserved, and unambiguous intron recognition cannot be achieved solely through a base-pairing mechanism. We isolated human 17 S U2 snRNP and reconstituted in vitro its adenosine 5´-triphosphate (ATP)–dependent remodeling and binding to the pre–messenger RNA substrate. We determined a series of high-resolution (2.0 to 2.2 angstrom) structures providing snapshots of the BS selection process. The substrate-bound U2 snRNP shows that SF3B6 stabilizes the BS:U2 snRNA duplex, which could aid binding of introns with poor sequence complementarity. ATP-dependent remodeling uncoupled from substrate binding captures U2 snRNA in a conformation that competes with BS recognition, providing a selection mechanism based on branch helix stability.


  • Organizational Affiliation

    European Molecular Biology Laboratory, 71 Avenue des Martyrs, 38042 Grenoble, France.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Splicing factor 3A subunit 2A [auth 1]464Homo sapiensMutation(s): 0 
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Find proteins for Q15428 (Homo sapiens)
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PHAROS:  Q15428
GTEx:  ENSG00000104897 
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UniProt GroupQ15428
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Splicing factor 3A subunit 3C [auth 9]501Homo sapiensMutation(s): 0 
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Find proteins for Q12874 (Homo sapiens)
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PHAROS:  Q12874
GTEx:  ENSG00000183431 
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UniProt GroupQ12874
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Splicing factor 3B subunit 1D [auth A]1,304Homo sapiensMutation(s): 0 
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PHAROS:  O75533
GTEx:  ENSG00000115524 
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UniProt GroupO75533
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Splicing factor 3B subunit 2E [auth B]895Homo sapiensMutation(s): 0 
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Find proteins for Q13435 (Homo sapiens)
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PHAROS:  Q13435
GTEx:  ENSG00000087365 
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UniProt GroupQ13435
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Splicing factor 3B subunit 3F [auth C]1,217Homo sapiensMutation(s): 0 
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Find proteins for Q15393 (Homo sapiens)
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PHAROS:  Q15393
GTEx:  ENSG00000189091 
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UniProt GroupQ15393
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Splicing factor 3B subunit 5G [auth E]86Homo sapiensMutation(s): 0 
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Find proteins for Q9BWJ5 (Homo sapiens)
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PHAROS:  Q9BWJ5
GTEx:  ENSG00000169976 
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UniProt GroupQ9BWJ5
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Splicing factor 3B subunit 6H [auth F]125Homo sapiensMutation(s): 0 
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Find proteins for Q9Y3B4 (Homo sapiens)
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PHAROS:  Q9Y3B4
GTEx:  ENSG00000115128 
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UniProt GroupQ9Y3B4
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
PHD finger-like domain-containing protein 5AI [auth G]110Homo sapiensMutation(s): 0 
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Find proteins for Q7RTV0 (Homo sapiens)
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PHAROS:  Q7RTV0
GTEx:  ENSG00000100410 
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Entity ID: 2
MoleculeChains LengthOrganismImage
U2 snRNAB [auth 2]188Homo sapiens
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Entity ID: 10
MoleculeChains LengthOrganismImage
BPS oligoJ [auth h]17synthetic construct
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTREFMAC5.8
MODEL REFINEMENTLIBG
RECONSTRUCTIONRELION3.1

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research Council (ERC)European Union950278

Revision History  (Full details and data files)

  • Version 1.0: 2022-03-30
    Type: Initial release