AXH domain of human spinocerebellar ataxin-1

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.210 

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This is version 1.5 of the entry. See complete history


The structure of the AXH domain of spinocerebellar ataxin-1.

Chen, Y.W.Allen, M.D.Veprintsev, D.B.Lowe, J.Bycroft, M.

(2004) J Biol Chem 279: 3758-3765

  • DOI: https://doi.org/10.1074/jbc.M309817200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Spinocerebellar ataxia type 1 is a late-onset neurodegenerative disease caused by the expansion of a CAG triplet repeat in the SCA1 gene. This results in the lengthening of a polyglutamine tract in the gene product ataxin-1. This produces a toxic gain of function that results in specific neuronal death. A region in ataxin-1, the AXH domain, exhibits significant sequence similarity to the transcription factor HBP1. This region of the protein has been implicated in RNA binding and self-association. We have determined the crystal structure of the AXH domain of ataxin-1. The AXH domain is dimeric and contains an OB-fold, a structural motif found in many oligonucleotide-binding proteins, supporting its proposed role in RNA binding. By structure comparison with other proteins that contain an OB-fold, a putative RNA-binding site has been identified. We also identified a cluster of charged surface residues that are well conserved among AXH domains. These residues may constitute a second ligand-binding surface, suggesting that all AXH domains interact with a common yet unidentified partner.

  • Organizational Affiliation

    Centre for Protein Engineering, Medical Research Council Centre, Cambridge, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
133Homo 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
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.210 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.783α = 90
b = 82.441β = 90
c = 137.781γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-11-06
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-24
    Changes: Source and taxonomy
  • Version 1.4: 2019-02-06
    Changes: Data collection, Database references, Experimental preparation
  • Version 1.5: 2019-10-09
    Changes: Data collection, Derived calculations