2Q5D

Crystal Structure of Human Importin Beta bound to the Snurportin1 IBB-domain second crystal form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.303 

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This is version 1.2 of the entry. See complete history


Literature

Molecular Basis for the Recognition of Snurportin 1 by Importin {beta}.

Mitrousis, G.Olia, A.S.Walker-Kopp, N.Cingolani, G.

(2008) J Biol Chem 283: 7877-7884

  • DOI: 10.1074/jbc.M709093200
  • Primary Citation of Related Structures:  
    2Q5D, 2P8Q

  • PubMed Abstract: 
  • The nuclear import of uridine-rich ribonucleoproteins is mediated by the transport adaptor snurportin 1 (SNP1). Similar to importin alpha, SNP1 uses an N-terminal importin beta binding (sIBB) domain to recruit the receptor importin beta and gain access to the nucleus ...

    The nuclear import of uridine-rich ribonucleoproteins is mediated by the transport adaptor snurportin 1 (SNP1). Similar to importin alpha, SNP1 uses an N-terminal importin beta binding (sIBB) domain to recruit the receptor importin beta and gain access to the nucleus. In this study, we demonstrate that the sIBB domain has a bipartite nature, which contains two distinct binding determinants for importin beta. The first determinant spans residues 25-65 and includes the previously identified importin alpha IBB (alphaIBB) region of homology. The second binding determinant encompasses residues 1-24 and resembles region 1011-1035 of the nucleoporin 153 (Nup153). The two binding determinants synergize within the sIBB domain to confer a low nanomolar binding affinity for importin beta (K(d) approximately 2 nm) in an interaction that, in vitro, is displaced by RanGTP. We propose that in vivo the synergy of Nup153 and nuclear RanGTP promotes translocation of uridine-rich ribonucleoproteins into the nucleus.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, State University of New York (SUNY) Upstate Medical University, Syracuse, New York 13210, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Importin beta-1 subunit AB876Homo sapiensMutation(s): 0 
Gene Names: KPNB1NTF97
Find proteins for Q14974 (Homo sapiens)
Explore Q14974 
Go to UniProtKB:  Q14974
NIH Common Fund Data Resources
PHAROS:  Q14974
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Snurportin-1 CD40Homo sapiensMutation(s): 0 
Gene Names: SNUPNRNUT1SPN1
Find proteins for O95149 (Homo sapiens)
Explore O95149 
Go to UniProtKB:  O95149
NIH Common Fund Data Resources
PHAROS:  O95149
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.303 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.985α = 90
b = 100.696β = 109.23
c = 108.68γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-01-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-04-02
    Changes: Source and taxonomy