2Q5D

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.303 

wwPDB Validation 3D Report Full Report


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:  

  • 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 acce ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Importin beta-1 subunit
A, B
876Homo sapiensMutation(s): 0 
Gene Names: KPNB1 (NTF97)
Find proteins for Q14974 (Homo sapiens)
Go to Gene View: KPNB1
Go to UniProtKB:  Q14974
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Snurportin-1
C, D
40Homo sapiensMutation(s): 0 
Gene Names: SNUPN (RNUT1, SPN1)
Find proteins for O95149 (Homo sapiens)
Go to Gene View: SNUPN
Go to UniProtKB:  O95149
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 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 = 90.00
b = 100.696β = 109.23
c = 108.680γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
ADSCdata collection
DENZOdata reduction
CNSphasing
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

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