4BSN

Crystal structure of the Nuclear Export Receptor CRM1 (exportin-1) lacking the C-terminal helical extension at 4.1A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.1 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.275 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of a Truncation Mutant of the Nuclear Export Factor Crm1 Provides Insights Into the Auto-Inhibitory Role of its C-Terminal Helix.

Dian, C.Bernaudat, F.Langer, K.Oliva, M.F.Fornerod, M.Schoehn, G.Muller, C.W.Petosa, C.

(2013) Structure 21: 1338

  • DOI: 10.1016/j.str.2013.06.003
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Chromosome region maintenance 1/exportin1/Xpo1 (CRM1) associates with the GTPase Ran to mediate the nuclear export of proteins bearing a leucine-rich nuclear export signal (NES). CRM1 consists of helical hairpin HEAT repeats and a C-terminal helical ...

    Chromosome region maintenance 1/exportin1/Xpo1 (CRM1) associates with the GTPase Ran to mediate the nuclear export of proteins bearing a leucine-rich nuclear export signal (NES). CRM1 consists of helical hairpin HEAT repeats and a C-terminal helical extension (C-extension) that inhibits the binding of NES-bearing cargos. We report the crystal structure and small-angle X-ray scattering analysis of a human CRM1 mutant with enhanced NES-binding activity due to deletion of the C-extension. We show that loss of the C-extension leads to a repositioning of CRM1's C-terminal repeats and to a more extended overall conformation. Normal mode analysis predicts reduced rigidity for the deletion mutant, consistent with an observed decrease in thermal stability. Point mutations that destabilize the C-extension shift CRM1 to the more extended conformation, reduce thermal stability, and enhance NES-binding activity. These findings suggest that an important mechanism by which the C-extension regulates CRM1's cargo-binding affinity is by modulating the conformation and flexibility of its HEAT repeats.


    Organizational Affiliation

    Université de Grenoble Alpes, Institut de Biologie Structurale, 38027 Grenoble, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EXPORTIN-1
A
1032Homo sapiensMutation(s): 0 
Gene Names: XPO1 (CRM1)
Find proteins for O14980 (Homo sapiens)
Go to Gene View: XPO1
Go to UniProtKB:  O14980
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.1 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.275 
  • Space Group: C 2 2 21
  • Diffraction Data DOI: 
    10.15785/SBGRID/77 SBGrid
Unit Cell:
Length (Å)Angle (°)
a = 146.960α = 90.00
b = 246.750β = 90.00
c = 106.340γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
XDSdata scaling
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-07-31
    Type: Initial release
  • Version 1.1: 2013-08-28
    Type: Database references