4RXH

Crystal Structure of Importin-alpha from Neurospora crassa complexed with SV40NLS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7553 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structure of Importin-alpha from a Filamentous Fungus in Complex with a Classical Nuclear Localization Signal.

Bernardes, N.E.Takeda, A.A.Dreyer, T.R.Freitas, F.Z.Bertolini, M.C.Fontes, M.R.

(2015) Plos One 10: e0128687-e0128687

  • DOI: 10.1371/journal.pone.0128687

  • PubMed Abstract: 
  • Neurospora crassa is a filamentous fungus that has been extensively studied as a model organism for eukaryotic biology, providing fundamental insights into cellular processes such as cell signaling, growth and differentiation. To advance in the study ...

    Neurospora crassa is a filamentous fungus that has been extensively studied as a model organism for eukaryotic biology, providing fundamental insights into cellular processes such as cell signaling, growth and differentiation. To advance in the study of this multicellular organism, an understanding of the specific mechanisms for protein transport into the cell nucleus is essential. Importin-α (Imp-α) is the receptor for cargo proteins that contain specific nuclear localization signals (NLSs) that play a key role in the classical nuclear import pathway. Structures of Imp-α from different organisms (yeast, rice, mouse, and human) have been determined, revealing that this receptor possesses a conserved structural scaffold. However, recent studies have demonstrated that the Impα mechanism of action may vary significantly for different organisms or for different isoforms from the same organism. Therefore, structural, functional, and biophysical characterization of different Impα proteins is necessary to understand the selectivity of nuclear transport. Here, we determined the first crystal structure of an Impα from a filamentous fungus which is also the highest resolution Impα structure already solved to date (1.75 Å). In addition, we performed calorimetric analysis to determine the affinity and thermodynamic parameters of the interaction between Imp-α and the classical SV40 NLS peptide. The comparison of these data with previous studies on Impα proteins led us to demonstrate that N. crassa Imp-α possess specific features that are distinct from mammalian Imp-α but exhibit important similarities to rice Imp-α, particularly at the minor NLS binding site.


    Organizational Affiliation

    Departamento de Física e Biofísica, Instituto de Biociências, Universidade Estadual Paulista, UNESP, Botucatu, SP, Brazil.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Importin subunit alpha
B
495Neurospora crassaMutation(s): 0 
Gene Names: 3H10.030
Find proteins for Q9C2K9 (Neurospora crassa)
Go to UniProtKB:  Q9C2K9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Large T antigen
A, C
8Simian virus 40Mutation(s): 0 
EC: 3.6.4.-
Find proteins for P03070 (Simian virus 40)
Go to UniProtKB:  P03070
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7553 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.183 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 45.127α = 90.00
b = 64.494β = 90.00
c = 185.650γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
PHENIXphasing
CBASSdata collection
HKL-2000data scaling
PHENIXmodel building
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-07-01
    Type: Initial release