3FEX

Crystal structure of the CBC-importin alpha complex.

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.55 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.221 

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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 1A790Homo sapiensMutation(s): 0 
Gene Names: CBP80, NCBP, NCBP1
UniProt & NIH Common Fund Data Resources
Find proteins for Q09161 (Homo sapiens)
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Go to UniProtKB:  Q09161
PHAROS:  Q09161
GTEx:  ENSG00000136937 
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UniProt GroupQ09161
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Nuclear cap-binding protein subunit 2B156Homo sapiensMutation(s): 0 
Gene Names: CBP20, NCBP2, PIG55
UniProt & NIH Common Fund Data Resources
Find proteins for P52298 (Homo sapiens)
Explore P52298 
Go to UniProtKB:  P52298
PHAROS:  P52298
GTEx:  ENSG00000114503 
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UniProt GroupP52298
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Importin subunit alpha-2C467Homo sapiensMutation(s): 0 
Gene Names: KPNA2, RCH1, SRP1
UniProt & NIH Common Fund Data Resources
Find proteins for P52292 (Homo sapiens)
Explore P52292 
Go to UniProtKB:  P52292
PHAROS:  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: 3.55 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.221 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.508α = 90
b = 102.051β = 108.82
c = 107.878γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data 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: Version format compliance