5OWU

Kap95:Nup1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.176 

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This is version 1.0 of the entry. See complete history


Literature

Structural basis for the high-affinity binding of nucleoporin Nup1p to the Saccharomyces cerevisiae importin-beta homologue, Kap95p.

Liu, S.M.Stewart, M.

(2005) J Mol Biol 349: 515-525

  • DOI: 10.1016/j.jmb.2005.04.003
  • Primary Citation of Related Structures:  
    5OWU

  • PubMed Abstract: 
  • Macromolecules are transported across the nuclear envelope most frequently by karyopherin/importin-beta superfamily members that are constructed from HEAT repeats. Transport of Kap95p (yeast importin-beta), the principal carrier for protein import, through nuclear pore complexes is facilitated by interactions with nucleoporins containing FG repeats ...

    Macromolecules are transported across the nuclear envelope most frequently by karyopherin/importin-beta superfamily members that are constructed from HEAT repeats. Transport of Kap95p (yeast importin-beta), the principal carrier for protein import, through nuclear pore complexes is facilitated by interactions with nucleoporins containing FG repeats. However, Nup1p interacts more strongly with Kap95p than other FG-nucleoporins. To establish the basis of this increased affinity, we determined the structure of Kap95p complexed with Nup1p residues 963-1076 that contain the high-affinity Kap95p binding site. Nup1p binds Kap95p at three sites between the outer A-helices of HEAT repeats 5, 6, 7 and 8. At each site, phenylalanine residues from Nup1p are buried in hydrophobic depressions between adjacent HEAT repeats. Although the Nup1p and generic FG-nucleoporin binding sites on Kap95p overlap, Nup1p binding differs markedly and has contributions from additional hydrophobic residues, together with interactions generated by the intimate contact of the linker between Nup1 residues 977-987 with Kap95p. The length and composition of this linker is crucial and suggests how differences in affinity for Kap95p both between and within FG-nucleoporins arise.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Importin subunit beta-1 A861Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: KAP95YLR347CL8300.15
Find proteins for Q06142 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q06142 
Go to UniProtKB:  Q06142
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Nucleoporin NUP1 B1076Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: NUP1YOR098CYOR3182C
Find proteins for P20676 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P20676 
Go to UniProtKB:  P20676
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.176 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.372α = 90
b = 126.534β = 100.17
c = 69.649γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2017-09-04 
  • Released Date: 2017-10-25 
  • Deposition Author(s): Stewart, M.
  • This entry supersedes: 2BPT

Revision History  (Full details and data files)

  • Version 1.0: 2017-10-25
    Type: Initial release