4J2J

Crystal structure of AXH domain complex with Capicua


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.223 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural basis of protein complex formation and reconfiguration by polyglutamine disease protein Ataxin-1 and Capicua

Kim, E.Lu, H.-C.Zoghbi, H.Y.Song, J.-J.

(2013) Genes Dev. 27: 590-595

  • DOI: 10.1101/gad.212068.112
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Spinocerebellar ataxia type 1 (SCA1) is a dominantly inherited neurodegenerative disease caused by polyglutamine expansion in Ataxin-1 (ATXN1). ATXN1 binds to the transcriptional repressor Capicua (CIC), and the interaction plays a critical role in S ...

    Spinocerebellar ataxia type 1 (SCA1) is a dominantly inherited neurodegenerative disease caused by polyglutamine expansion in Ataxin-1 (ATXN1). ATXN1 binds to the transcriptional repressor Capicua (CIC), and the interaction plays a critical role in SCA1 pathogenesis whereby reducing CIC levels rescues SCA1-like phenotypes in a mouse model. The ATXN1/HBP1 (AXH) domain of ATXN1 mediates its homodimerization as well as the interaction with CIC. Here, we present the crystal structure of ATXN1's AXH domain bound to CIC and show that the binding pocket of the AXH domain to CIC overlaps with the homodimerization pocket of the AXH domain. Thus, the binding to CIC disrupts the homodimerization of ATXN1. Furthermore, the binding of CIC reconfigures the complex to allow another form of dimerization mediated by CIC, showing the intricacy of protein complex formation and reconfiguration by ATXN1 and CIC. Identifying the surfaces mediating the interactions between CIC and ATXN1 reveals a critical role for CIC in the reconfiguration of the AXH dimers and might provide insight into ways to target the ATXN1/CIC interactions to modulate SCA1 pathogenesis.


    Organizational Affiliation

    Department of Biological Sciences, Graduate School of Nanoscience and Technology (World Class University), KAIST (Korea Advanced Institute of Science and Technology) Institute for the BioCentury, KAIST, Daejeon 305-701, Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ataxin-1
A, B, C
129Homo sapiensMutation(s): 2 
Gene Names: ATXN1 (ATX1, SCA1)
Find proteins for P54253 (Homo sapiens)
Go to Gene View: ATXN1
Go to UniProtKB:  P54253
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein capicua homolog
D, E, F
21Homo sapiensMutation(s): 0 
Gene Names: CIC (KIAA0306)
Find proteins for Q96RK0 (Homo sapiens)
Go to Gene View: CIC
Go to UniProtKB:  Q96RK0
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.223 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 77.722α = 90.00
b = 89.096β = 90.00
c = 132.663γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
HKL-2000data scaling
CNSrefinement
HKL-2000data reduction
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-02-04 
  • Released Date: 2013-04-03 
  • Deposition Author(s): Song, J.-J., Kim, E.

Revision History 

  • Version 1.0: 2013-04-03
    Type: Initial release