4XRK

Crystal Structure of Importin Beta in a Polyethylene Glycol Condition


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.25 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.289 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Impact of the crystallization condition on importin-beta conformation.

Tauchert, M.J.Hemonnot, C.Neumann, P.Koster, S.Ficner, R.Dickmanns, A.

(2016) Acta Crystallogr D Struct Biol 72: 705-717

  • DOI: 10.1107/S2059798316004940
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In eukaryotic cells, the exchange of macromolecules between the nucleus and cytoplasm is highly selective and requires specialized soluble transport factors. Many of them belong to the importin-β superfamily, the members of which share an overall sup ...

    In eukaryotic cells, the exchange of macromolecules between the nucleus and cytoplasm is highly selective and requires specialized soluble transport factors. Many of them belong to the importin-β superfamily, the members of which share an overall superhelical structure owing to the tandem arrangement of a specific motif, the HEAT repeat. This structural organization leads to great intrinsic flexibility, which in turn is a prerequisite for the interaction with a variety of proteins and for its transport function. During the passage from the aqueous cytosol into the nucleus, the receptor passes the gated channel of the nuclear pore complex filled with a protein meshwork of unknown organization, which seems to be highly selective owing to the presence of FG-repeats, which are peptides with hydrophobic patches. Here, the structural changes of free importin-β from a single organism, crystallized in polar (salt) or apolar (PEG) buffer conditions, are reported. This allowed analysis of the structural changes, which are attributable to the surrounding milieu and are not affected by bound interaction partners. The importin-β structures obtained exhibit significant conformational changes and suggest an influence of the polarity of the environment, resulting in an extended conformation in the PEG condition. The significance of this observation is supported by SAXS experiments and the analysis of other crystal structures of importin-β deposited in the Protein Data Bank.


    Organizational Affiliation

    Department of Molecular Structural Biology, Institute for Microbiology and Genetics, GZMB, Georg-August-University Göttingen, Justus-von-Liebig-Weg 11, 37077 Göttingen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Importin Beta
A
882Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719)Mutation(s): 0 
Find proteins for G0S143 (Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719))
Go to UniProtKB:  G0S143
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.25 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.289 
  • Space Group: P 21 2 21
Unit Cell:
Length (Å)Angle (°)
a = 64.410α = 90.00
b = 121.190β = 90.00
c = 132.040γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
MOLREPphasing
PDB_EXTRACTdata extraction
PHENIXrefinement
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research FoundationGermany--

Revision History 

  • Version 1.0: 2016-01-27
    Type: Initial release
  • Version 1.1: 2016-06-08
    Type: Database references
  • Version 1.2: 2016-06-29
    Type: Database references
  • Version 1.3: 2018-03-14
    Type: Author supporting evidence, Data collection