3FEY

Crystal structure of the CBC-importin alpha complex.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.192 

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

  • 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 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Nuclear cap-binding protein subunit 1
A
790Homo sapiensGene Names: NCBP1 (CBP80, NCBP)
Find proteins for Q09161 (Homo sapiens)
Go to Gene View: NCBP1
Go to UniProtKB:  Q09161
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Nuclear cap-binding protein subunit 2
B
156Homo sapiensGene Names: NCBP2 (CBP20)
Find proteins for P52298 (Homo sapiens)
Go to Gene View: NCBP2
Go to UniProtKB:  P52298
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Importin subunit alpha-2
C
467Homo sapiensGene Names: KPNA2 (RCH1, SRP1)
Find proteins for P52292 (Homo sapiens)
Go to Gene View: KPNA2
Go to UniProtKB:  P52292
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.192 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 83.842α = 90.00
b = 104.505β = 109.04
c = 108.558γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
REFMACrefinement
PHASERphasing
SCALAdata scaling
ADSCdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-08-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance