3IO6

Huntingtin amino-terminal region with 17 Gln residues - crystal C92-a


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.70 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.248 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Secondary structure of Huntingtin amino-terminal region.

Kim, M.W.Chelliah, Y.Kim, S.W.Otwinowski, Z.Bezprozvanny, I.

(2009) Structure 17: 1205-1212

  • DOI: 10.1016/j.str.2009.08.002
  • Primary Citation of Related Structures:  
    3IO4, 3IO6, 3IOR, 3IOT, 3IOU, 3IOV, 3IOW

  • PubMed Abstract: 
  • Huntington's disease is a genetic neurodegenerative disorder resulting from polyglutamine (polyQ) expansion (>36Q) within the first exon of Huntingtin (Htt) protein. We applied X-ray crystallography to determine the secondary structure of the first exon (EX1) of Htt17Q ...

    Huntington's disease is a genetic neurodegenerative disorder resulting from polyglutamine (polyQ) expansion (>36Q) within the first exon of Huntingtin (Htt) protein. We applied X-ray crystallography to determine the secondary structure of the first exon (EX1) of Htt17Q. The structure of Htt17Q-EX1 consists of an amino-terminal alpha helix, poly17Q region, and polyproline helix formed by the proline-rich region. The poly17Q region adopts multiple conformations in the structure, including alpha helix, random coil, and extended loop. The conformation of the poly17Q region is influenced by the conformation of neighboring protein regions, demonstrating the importance of the native protein context. We propose that the conformational flexibility of the polyQ region observed in our structure is a common characteristic of many amyloidogenic proteins. We further propose that the pathogenic polyQ expansion in the Htt protein increases the length of the random coil, which promotes aggregation and facilitates abnormal interactions with other proteins in cells.


    Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA. MeeWhi.Kim@UTSouthwestern.edu



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Maltose-binding periplasmic protein, HUNTINGTIN FUSION PROTEINA, C [auth B], B [auth C]449Escherichia coli K-12Homo sapiens
This entity is chimeric
Mutation(s): 0 
Gene Names: malEb4034
Find proteins for P0AEX9 (Escherichia coli (strain K12))
Explore P0AEX9 
Go to UniProtKB:  P0AEX9
Find proteins for P42858 (Homo sapiens)
Explore P42858 
Go to UniProtKB:  P42858
NIH Common Fund Data Resources
PHAROS:  P42858
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.70 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.248 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 163.401α = 90
b = 101.242β = 92
c = 138.19γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-10-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2017-06-21
    Changes: Database references, Structure summary