3FEY

Crystal structure of the CBC-importin alpha complex.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The molecular basis for the regulation of the cap-binding complex by the importins.

Dias, S.M.Wilson, K.F.Rojas, K.S.Ambrosio, A.L.Cerione, R.A.

(2009) Nat Struct Mol Biol 16: 930-937

  • DOI: https://doi.org/10.1038/nsmb.1649
  • Primary Citation of Related Structures:  
    3FEX, 3FEY

  • PubMed Abstract: 

    The binding of capped RNAs to the cap-binding complex (CBC) in the nucleus, and their dissociation from the CBC in the cytosol, represent essential steps in RNA processing. Here we show how the nucleocytoplasmic transport proteins importin-alpha and importin-beta have key roles in regulating these events. As a first step toward understanding the molecular basis for this regulation, we determined a 2.2-A resolution X-ray structure for a CBC-importin-alpha complex that provides a detailed picture for how importin-alpha binds to the CBP80 subunit of the CBC. Through a combination of biochemical studies, X-ray crystallographic information and small-angle scattering experiments, we then determined how importin-beta binds to the CBC through its CBP20 subunit. Together, these studies enable us to propose a model describing how importin-beta stimulates the dissociation of capped RNA from the CBC in the cytosol following its nuclear export.


  • Organizational Affiliation

    Department of Molecular Medicine, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Nuclear cap-binding protein subunit 1790Homo sapiensMutation(s): 0 
Gene Names: CBP80NCBPNCBP1
UniProt & NIH Common Fund Data Resources
Find proteins for Q09161 (Homo sapiens)
Explore Q09161 
Go to UniProtKB:  Q09161
GTEx:  ENSG00000136937 
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UniProt GroupQ09161
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Nuclear cap-binding protein subunit 2156Homo sapiensMutation(s): 0 
Gene Names: CBP20NCBP2PIG55
UniProt & NIH Common Fund Data Resources
Find proteins for P52298 (Homo sapiens)
Explore P52298 
Go to UniProtKB:  P52298
GTEx:  ENSG00000114503 
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UniProt GroupP52298
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Importin subunit alpha-2467Homo sapiensMutation(s): 0 
Gene Names: KPNA2RCH1SRP1
UniProt & NIH Common Fund Data Resources
Find proteins for P52292 (Homo sapiens)
Explore P52292 
Go to UniProtKB:  P52292
GTEx:  ENSG00000182481 
Entity Groups  
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UniProt GroupP52292
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.842α = 90
b = 104.505β = 109.04
c = 108.558γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
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: 2009-08-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Refinement description