1QGR

STRUCTURE OF IMPORTIN BETA BOUND TO THE IBB DOMAIN OF IMPORTIN ALPHA (II CRYSTAL FORM, GROWN AT LOW PH)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.235 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of importin-beta bound to the IBB domain of importin-alpha.

Cingolani, G.Petosa, C.Weis, K.Muller, C.W.

(1999) Nature 399: 221-229

  • DOI: 10.1038/20367
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cytosolic proteins bearing a classical nuclear localization signal enter the nucleus bound to a heterodimer of importin-alpha and importin-beta (also called karyopherin-alpha and -beta). The formation of this heterodimer involves the importin-beta-bi ...

    Cytosolic proteins bearing a classical nuclear localization signal enter the nucleus bound to a heterodimer of importin-alpha and importin-beta (also called karyopherin-alpha and -beta). The formation of this heterodimer involves the importin-beta-binding (IBB) domain of importin-alpha, a highly basic amino-terminal region of roughly 40 amino-acid residues. Here we report the crystal structure of human importin-beta bound to the IBB domain of importin-alpha, determined at 2.5 A and 2.3 A resolution in two crystal forms. Importin-beta consists of 19 tandemly repeated HEAT motifs and wraps intimately around the IBB domain. The association involves two separate regions of importin-beta, recognizing structurally distinct parts of the IBB domain: an amino-terminal extended moiety and a carboxy-terminal helix. The structure indicates that significant conformational changes occur when importin-beta binds or releases the IBB domain domain and suggests how dissociation of the importin-alpha/beta heterodimer may be achieved upon nuclear entry.


    Organizational Affiliation

    European Molecular Biology Laboratory, Grenoble Outstation, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (IMPORTIN BETA SUBUNIT)
A
876Homo sapiensMutation(s): 0 
Gene Names: KPNB1 (NTF97)
Find proteins for Q14974 (Homo sapiens)
Go to Gene View: KPNB1
Go to UniProtKB:  Q14974
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (IMPORTIN ALPHA-2 SUBUNIT)
B
27Homo sapiensMutation(s): 0 
Gene 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: 2.3 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.235 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 57.896α = 90.00
b = 101.167β = 87.86
c = 83.831γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-05-24
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance