3T5V

Sac3:Thp1:Sem1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis for the assembly and nucleic acid binding of the TREX-2 transcription-export complex.

Ellisdon, A.M.Dimitrova, L.Hurt, E.Stewart, M.

(2012) Nat Struct Mol Biol 19: 328-336

  • DOI: https://doi.org/10.1038/nsmb.2235
  • Primary Citation of Related Structures:  
    3T5V, 3T5X

  • PubMed Abstract: 

    The conserved TREX-2 transcription-export complex integrates transcription and processing of many actively transcribed nascent mRNAs with the recruitment of export factors at nuclear pores and also contributes to transcriptional memory and genomic stability. We report the crystal structure of the Sac3-Thp1-Sem1 segment of Saccharomyces cerevisiae TREX-2 that interfaces with the gene expression machinery. Sac3-Thp1-Sem1 forms a previously uncharacterized PCI-domain complex characterized by the juxtaposition of Sac3 and Thp1 winged helix domains, forming a platform that mediates nucleic acid binding. Our structure-guided mutations support the idea that the Thp1-Sac3 interaction is an essential requirement for mRNA binding and for the coupling of transcription and processing to mRNP assembly and export. These results provide insight into how newly synthesized transcripts are efficiently transferred from TREX-2 to the principal mRNA export factor, and they reveal how Sem1 stabilizes PCI domain-containing proteins and promotes complex assembly.


  • Organizational Affiliation

    Medical Research Council Laboratory of Molecular Biology, Cambridge, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Nuclear mRNA export protein SAC3
A, D
316Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: LEP1SAC3YD8358.13YDR159W
UniProt
Find proteins for P46674 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P46674 
Go to UniProtKB:  P46674
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP46674
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Nuclear mRNA export protein THP1
B, E
455Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: BUD29O1140THP1YOL072W
UniProt
Find proteins for Q08231 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q08231 
Go to UniProtKB:  Q08231
Entity Groups  
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UniProt GroupQ08231
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
26S proteasome complex subunit SEM1
C, F
89Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: DSH1SEM1YDR363W-A
UniProt
Find proteins for O94742 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore O94742 
Go to UniProtKB:  O94742
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO94742
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 
  • Space Group: P 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 164.77α = 90
b = 164.77β = 90
c = 276.79γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
SHARPphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-02-22
    Type: Initial release
  • Version 1.1: 2012-03-21
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references