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 1.1 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: 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 ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Nuclear cap-binding protein subunit 1 A790Homo sapiensMutation(s): 0 
Gene Names: CBP80NCBPNCBP1
Find proteins for Q09161 (Homo sapiens)
Explore Q09161 
Go to UniProtKB:  Q09161
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PHAROS:  Q09161
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Nuclear cap-binding protein subunit 2 B156Homo sapiensMutation(s): 0 
Gene Names: CBP20NCBP2PIG55
Find proteins for P52298 (Homo sapiens)
Explore P52298 
Go to UniProtKB:  P52298
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PHAROS:  P52298
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Importin subunit alpha-2 C467Homo sapiensMutation(s): 0 
Gene Names: KPNA2RCH1SRP1
Find proteins for P52292 (Homo sapiens)
Explore P52292 
Go to UniProtKB:  P52292
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PHAROS:  P52292
Protein Feature View
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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

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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