1AR0

NUCLEAR TRANSPORT FACTOR 2 (NTF2) E42K MUTANT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Nuclear protein import is decreased by engineered mutants of nuclear transport factor 2 (NTF2) that do not bind GDP-Ran.

Clarkson, W.D.Corbett, A.H.Paschal, B.M.Kent, H.M.McCoy, A.J.Gerace, L.Silver, P.A.Stewart, M.

(1997) J Mol Biol 272: 716-730

  • DOI: 10.1006/jmbi.1997.1255
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Nuclear transport factor 2 (NTF2) is associated with the translocation stage of nuclear protein import and binds both to nuclear pore proteins (nucleoporins) containing phenylalanine-rich repeats and to the Ras family GTPase Ran. In this study we pro ...

    Nuclear transport factor 2 (NTF2) is associated with the translocation stage of nuclear protein import and binds both to nuclear pore proteins (nucleoporins) containing phenylalanine-rich repeats and to the Ras family GTPase Ran. In this study we probed the role of the NTF2-Ran interaction in nuclear protein import using site-directed mutants of NTF2 that interfere with its interaction with GDP-Ran. The design of these mutants was based on the X-ray crystal structure of NTF2 and was concentrated on conserved residues in and around the molecule's hydrophobic cavity. The mutant NTF2 cDNAs were expressed in Escherichia coli. Purified mutant proteins retained the interaction with FxFG-repeat nucleoporins, but several mutants in the negatively charged residues that surround the NTF2 cavity or in residues in the cavity itself were unable to bind GDP-Ran in vitro. The crystal structure of the E42K mutant protein showed significant structural changes only in this side-chain, indicating that it participated directly in the interaction with GDP-Ran. In permeabilised cell nuclear protein import assays, only wild-type NTF2 and mutants that bound GDP-Ran were functional. Furthermore, when the NTF2 E42K and D92N/D94N NTF2 mutants that failed to bind GDP-Ran in vitro were substituted for the chromosomal yeast NTF2, the yeast cells became non-viable, whereas yeast substituted with wild-type human NTF2 remained viable. We conclude that interaction between NTF2 and GDP-Ran is important for efficient nuclear protein import.


    Related Citations: 
    • The 1.6 Angstroms Resolution Crystal Structure of Nuclear Transport Factor 2 (Ntf2)
      Bullock, T.L., Clarkson, W.D., Kent, H.M., Stewart, M.
      (1996) J Mol Biol 260: 422
    • Crystal Structure of Scytalone Dehydratase--A Disease Determinant of the Rice Pathogen, Magnaporthe Grisea
      Lundqvist, T., Rice, J., Hodge, C.N., Basarab, G.S., Pierce, J., Lindqvist, Y.
      (1994) Structure 2: 937

    Organizational Affiliation

    MRC Laboratory of Molecular Biology, Cambridge, UK.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
NUCLEAR TRANSPORT FACTOR 2
A, B
127Rattus norvegicusMutation(s): 1 
Gene Names: Nutf2Ntf2
Find proteins for P61972 (Rattus norvegicus)
Go to UniProtKB:  P61972
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.200 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.95α = 90
b = 57.87β = 90
c = 88.34γ = 90
Software Package:
Software NamePurpose
CCP4model building
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling
CCP4phasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-12-24
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance