Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 

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This is version 1.4 of the entry. See complete history


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

  • DOI: https://doi.org/10.1006/jmbi.2001.5136
  • Primary Citation of Related Structures:  
    1JB2, 1JB4, 1JB5

  • 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.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
127Rattus norvegicusMutation(s): 1 
Gene Names: Nutf2Ntf2
Find proteins for P61972 (Rattus norvegicus)
Explore P61972 
Go to UniProtKB:  P61972
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61972
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 34.68α = 90
b = 78.21β = 104.55
c = 41.43γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • 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
  • Version 1.3: 2021-11-10
    Changes: Database references
  • Version 1.4: 2023-10-25
    Changes: Data collection, Refinement description