5EKF

Crystallization and X-ray Diffraction Data Collection of Importin-alpha from Mus musculus Complexed with a XPG NLS Peptide, fragment 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


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Literature

Structural and Calorimetric Studies Demonstrate that Xeroderma Pigmentosum Type G (XPG) Can Be Imported to the Nucleus by a Classical Nuclear Import Pathway via a Monopartite NLS Sequence.

Barros, A.C.Takeda, A.A.Dreyer, T.R.Velazquez-Campoy, A.Kobe, B.Fontes, M.R.

(2016) J.Mol.Biol. 428: 2120-2131

  • DOI: 10.1016/j.jmb.2016.01.019
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Xeroderma pigmentosum type G (XPG) proteins are involved in DNA lesion recognition and promotion of nucleotide excision repair. Specific mutations in these proteins may lead to Cockayne syndrome, in which the patients may display severe developmental ...

    Xeroderma pigmentosum type G (XPG) proteins are involved in DNA lesion recognition and promotion of nucleotide excision repair. Specific mutations in these proteins may lead to Cockayne syndrome, in which the patients may display severe developmental retardation and neurological abnormalities. No structural information is available for their spacer region or the C-terminal domain, which are important, respectively, for specific nucleotide excision repair activity and substrate specificity, as well as nuclear translocation. Immunofluorescence studies suggested two specific regions of the XPG C-terminus as potential bipartite nuclear localization sequences, which would be responsible for its translocation to the nucleus by the classical nuclear import pathway mediated by the importin-α (Impα). Thus, in order to test these hypotheses and gain insight into the structural basis for the nuclear import process for the XPG protein, we solved the crystal structures of complexes formed by the Impα and peptides corresponding to both putative nuclear localization signal (NLS) sequences (XPG1 and XPG2) and performed isothermal titration calorimetry assays to determine their binding affinities. Structural experiments confirm the binding of both NLS peptides to Impα but, unexpectedly, they bind to the receptor as monopartite NLSs. The isothermal titration calorimetry assays demonstrated that XPG1 and XPG2 peptides bind to two separate binding sites, but with high affinity to the major NLS-binding site of the Impα, resembling classical monopartite SV40 TAg NLS. The results lead to insights about what distinguishes monopartite and bipartite NLSs, as well as the differential roles of XPG1 and XPG2 NLSs in the nuclear localization of XPG.


    Organizational Affiliation

    Institute of Biocomputation and Physics of Complex Systems, Joint-Unit Institute of Physical Chemistry "Rocasolano"-Consejo Superior de Investigaciones Científicas-Institute of Biocomputation and Physics of Complex Systems, University of Zaragoza, Zaragoza, 50018, Spain; Department of Biochemistry and Molecular and Cell Biology, University of Zaragoza, Zaragoza, 50018, Spain; Fundacion Agencia Aragonesa para la Investigación y el Desarrollo, Government of Aragon, Zaragoza, 50018, Spain.,Departamento de Física e Biofísica, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, SP, 18618-970 Brazil.,School of Chemistry and Molecular Biosciences, Institute for Molecular Bioscience and Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Queensland 4072, Australia.,Departamento de Física e Biofísica, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, SP, 18618-970 Brazil. Electronic address: fontes@ibb.unesp.br.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA repair protein complementing XP-G cells
B, C
24Homo sapiensMutation(s): 0 
Gene Names: ERCC5 (ERCM2, XPG, XPGC)
EC: 3.1.-.-
Find proteins for P28715 (Homo sapiens)
Go to Gene View: ERCC5
Go to UniProtKB:  P28715
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Importin subunit alpha-1
A
510Mus musculusMutation(s): 0 
Gene Names: Kpna2 (Rch1)
Find proteins for P52293 (Mus musculus)
Go to UniProtKB:  P52293
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.171 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 78.589α = 90.00
b = 89.542β = 90.00
c = 99.801γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
PHENIXphasing
PHENIXrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-02-10
    Type: Initial release
  • Version 1.1: 2016-06-01
    Type: Database references