1O6O

Importin Beta aa1-442 bound to five FxFG repeats from yeast Nsp1p. Second crystal form

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 

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This is version 1.2 of the entry. See complete history. 


Literature

Glfg and Fxfg Nucleoporins Bind to Overlapping Sites on Importin-Beta

Bayliss, R., Littlewood, T., Strawn, L.A., Wente, S.R., Stewart, M.

(2002) J Biol Chem 277: 50597

  • DOI: 10.1074/jbc.M209037200
  • Primary Citation of Related Structures:  
    1O6O, 1O6P

  • PubMed Abstract: 

    • The interaction between nuclear pore proteins (nucleoporins) and transport factors is crucial for the translocation of macromolecules through nuclear pores. Many nucleoporins contain FG sequence repeats, and previous studies have demonstrated interactions between repeats containing FxFG or GLFG cores and transport factors ...

    The interaction between nuclear pore proteins (nucleoporins) and transport factors is crucial for the translocation of macromolecules through nuclear pores. Many nucleoporins contain FG sequence repeats, and previous studies have demonstrated interactions between repeats containing FxFG or GLFG cores and transport factors. The crystal structure of residues 1-442 of importin-beta bound to a GLFG peptide indicates that this repeat core binds to the same primary site as FxFG cores. Importin-beta-I178D shows reduced binding to both FxFG and GLFG repeats, consistent with both binding to an overlapping site in the hydrophobic groove between the A-helices of HEAT repeats 5 and 6. Moreover, FxFG repeats can displace importin-beta or its S. cerevisiae homologue, Kap95, bound to GLFG repeats. Addition of soluble GLFG repeats decreases the rate of nuclear protein import in digitonin-permeabilized HeLa cells, indicating that this interaction has a role in the translocation of carrier-cargo complexes through nuclear pores. The binding of GLFG and FxFG repeats to overlapping sites on importin-beta indicates that functional differences between different repeats probably arise from differences in their spatial organization.

    Organizational Affiliation: 

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



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
IMPORTIN BETA-1 SUBUNIT A, B, C442Homo sapiensMutation(s): 0 
Gene Names: KPNB1, NTF97
Find proteins for Q14974 (Homo sapiens)
Explore Q14974 
Go to UniProtKB:  Q14974
NIH Common Fund Data Resources
PHAROS:  Q14974
GTEx:  ENSG00000108424
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
NUCLEOPORIN NSP1 D, E, F119Saccharomyces cerevisiaeMutation(s): 0 
Find proteins for P14907 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P14907 
Go to UniProtKB:  P14907
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.11α = 90
b = 125.35β = 90
c = 266.67γ = 90
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
SCALAdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-10-17
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance