The structure of the AXH domain of ataxin-1.

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 

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This is version 1.2 of the entry. See complete history


Self-Assembly and Conformational Heterogeneity of the Axh Domain of Ataxin-1: An Unusual Example of a Chameleon Fold

De Chiara, C.Rees, M.Menon, R.P.Pauwels, K.Lawrence, C.Konarev, P.V.Svergun, D.I.Martin, S.R.Chen, Y.W.Pastore, A.

(2013) Biophys J 104: 1304

  • DOI: https://doi.org/10.1016/j.bpj.2013.01.048
  • Primary Citation of Related Structures:  
    4APT, 4AQP

  • PubMed Abstract: 

    Ataxin-1 is a human protein responsible for spinocerebellar ataxia type 1, a hereditary disease associated with protein aggregation and misfolding. Essential for ataxin-1 aggregation is the anomalous expansion of a polyglutamine tract near the protein N-terminus, but the sequence-wise distant AXH domain modulates and contributes to the process. The AXH domain is also involved in the nonpathologic functions of the protein, including a variety of intermolecular interactions with other cellular partners. The domain forms a globular dimer in solution and displays a dimer of dimers arrangement in the crystal asymmetric unit. Here, we have characterized the domain further by studying its behavior in the crystal and in solution. We solved two new structures of the domain crystallized under different conditions that confirm an inherent plasticity of the AXH fold. In solution, the domain is present as a complex equilibrium mixture of monomeric, dimeric, and higher molecular weight species. This behavior, together with the tendency of the AXH fold to be trapped in local conformations, and the multiplicity of protomer interfaces, makes the AXH domain an unusual example of a chameleon protein whose properties bear potential relevance for the aggregation properties of ataxin-1 and thus for disease.

  • Organizational Affiliation

    Medical Research Council National Institute for Medical Research London, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
126Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P54253 (Homo sapiens)
Explore P54253 
Go to UniProtKB:  P54253
PHAROS:  P54253
GTEx:  ENSG00000124788 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP54253
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NA

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.47α = 90
b = 80.83β = 90
c = 139.96γ = 90
Software Package:
Software NamePurpose
iMOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-03-27
    Type: Initial release
  • Version 1.1: 2013-04-17
    Changes: Database references
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description