Huntingtin amino-terminal region with 17 Gln residues - Crystal C90

Experimental Data Snapshot

  • Resolution: 3.63 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.254 

wwPDB Validation   3D Report Full Report

This is version 2.1 of the entry. See complete history


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: https://doi.org/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. 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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Maltose-binding periplasmic protein,Huntingtin fusion protein
A, B, C
449Escherichia coli O157:H7Homo sapiens
This entity is chimeric
Mutation(s): 0 
Gene Names: malEZ5632ECs5017HTTHDIT15
UniProt & NIH Common Fund Data Resources
Find proteins for P42858 (Homo sapiens)
Explore P42858 
Go to UniProtKB:  P42858
PHAROS:  P42858
GTEx:  ENSG00000197386 
Find proteins for P0AEY0 (Escherichia coli O157:H7)
Explore P0AEY0 
Go to UniProtKB:  P0AEY0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP42858P0AEY0
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on ZN

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
F [auth A]
G [auth B]
H [auth B]
D [auth A],
E [auth A],
F [auth A],
G [auth B],
H [auth B],
I [auth B],
M [auth C],
N [auth C]
Query on CA

Download Ideal Coordinates CCD File 
J [auth B]
K [auth B]
L [auth B]
O [auth C]
P [auth C]
J [auth B],
K [auth B],
L [auth B],
O [auth C],
P [auth C],
Q [auth C]
Experimental Data & Validation

Experimental Data

  • Resolution: 3.63 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.254 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 162.95α = 90
b = 101.21β = 90.42
c = 142.05γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
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: Version format compliance
  • Version 2.0: 2017-06-21
    Changes: Advisory, Atomic model, Database references, Derived calculations, Source and taxonomy, Structure summary
  • Version 2.1: 2023-09-06
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description