Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 28.95 kDa 
• Atom Count: 2103 
• Modelled Residue Count: 246 
• Deposited Residue Count: 254 
• Unique protein chains: 1

1JB2

CRYSTAL STRUCTURE OF NTF2 M84E MUTANT

• DOI: 10.2210/pdb1JB2/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Rattus norvegicus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2001-06-01 Released: 2002-03-13 
• Deposition Author(s): Chaillan-Huntington, C., Butler, P.J., Huntington, J.A., Akin, D., Feldherr, C., Stewart, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.251 
• R-Value Work: 0.207 
• R-Value Observed: 0.207 

Literature

NTF2 monomer-dimer equilibrium.

Chaillan-Huntington, C., Butler, P.J., Huntington, J.A., Akin, D., Feldherr, C., Stewart, M.

(2001) J Mol Biol 314: 465-477

• PubMed: 11846560 
• DOI: 10.1006/jmbi.2001.5136
• Primary Citation of Related Structures:  
  1JB5, 1JB4, 1JB2


• PubMed Abstract: 
  

Nuclear transport factor 2 (NTF2) mediates nuclear import of RanGDP, a central component of many nuclear trafficking pathways. NTF2 is a homodimer and each chain has independent binding sites for RanGDP and nuclear pore proteins (nucleoporins) that contain FxFG sequence repeats. We show here that the monomer-dimer dissociation constant for NTF2 obtained by sedimentation equilibrium ultracentrifugation is in the micromolar range, indicating that a substantial proportion of cellular NTF2 may be monomeric. To investigate the functional significance of NTF2 dimerization, we engineered a series of point mutations at the dimerization interface and one of these (M118E) remained monomeric below concentrations of 150 microM. CD spectra and X-ray crystallography showed that M118E-NTF2 preserved the wild-type NTF2 fold, although its thermal stability was 20 deg. C lower than that of the wild-type. M118E-NTF2 bound both RanGDP and FxFG nucleoporins less strongly, suggesting that dissociation of the NTF2 dimer could facilitate RanGDP release and thus nucleotide exchange after it had been transported into the nucleus. Moreover, colloidal gold coated with M118E-NTF2 showed reduced binding to Xenopus oocyte nuclear pores. Overall, our results indicate that dimer formation is important for NTF2 function and give insight into the formation of heterodimers by mRNA export factors such as TAP1 and NXT1 that contain NTF2-homology domains.

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Organizational Affiliation: 

Laboratory of Molecular Biology, MRC, Hills Road, Cambridge, CB2 2QH, England.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
NUCLEAR TRANSPORT FACTOR 2	A, B	127	Rattus norvegicus	Mutation(s): 1  Gene Names: Nutf2, Ntf2
Find proteins for P61972 (Rattus norvegicus) Explore P61972  Go to UniProtKB:  P61972

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.251 
• R-Value Work: 0.207 
• R-Value Observed: 0.207 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 34.29	α = 90
b = 79.444	β = 103.8
c = 41.747	γ = 90

Software Package:

Software Name	Purpose
AMoRE	phasing
CNS	refinement
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-06-01 
• Released Date: 2002-03-13 
Deposition Author(s): Chaillan-Huntington, C., Butler, P.J., Huntington, J.A., Akin, D., Feldherr, C., Stewart, M.

Revision History  

• Version 1.0: 2002-03-13
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance