4AQP

The structure of the AXH domain of ataxin-1.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

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: 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 ...

    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.


    Related Citations: 
    • 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
    • The Axh Module: An Independently Folded Domain Common to Ataxin-1 and Hbp1.
      De Chiara, C., Giannini, C., Adinolfi, S., De Boer, J., Guida, S., Ramos, A., Jodice, C., Kioussis, D., Pastore, A.
      (2003) FEBS Lett 551: 107
    • Polyglutamine is not All: The Functional Role of the Axh Domain in the Ataxin-1 Protein.
      De Chiara, C., Menon, R.P., Dal Piaz, F., Calder, L., Pastore, A.
      (2005) J Mol Biol 354: 883

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATAXIN-1ABCD126Homo sapiensMutation(s): 0 
Gene Names: ATXN1ATX1SCA1
Find proteins for P54253 (Homo sapiens)
Explore P54253 
Go to UniProtKB:  P54253
NIH Common Fund Data Resources
PHAROS  P54253
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PEG
Query on PEG

Download CCD File 
B
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download CCD File 
B, C, D
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.539α = 90
b = 82.699β = 90
c = 137.11γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-03-27
    Type: Initial release
  • Version 1.1: 2013-04-17
    Changes: Database references