Crystal Structure of Htt36Q3H

Experimental Data Snapshot

  • Resolution: 2.81 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.239 

wwPDB Validation   3D Report Full Report

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Beta conformation of polyglutamine track revealed by a crystal structure of Huntingtin N-terminal region with insertion of three histidine residues.

Kim, M.

(2013) Prion 7: 221-228

  • DOI: https://doi.org/10.4161/pri.23807
  • Primary Citation of Related Structures:  
    4FE8, 4FEB, 4FEC, 4FED

  • PubMed Abstract: 

    Huntington disease is an autosomal-dominant neurodegenerative disorder caused by a polyglutamine (polyQ) expansion (> 35Q) in the first exon (EX1) of huntingtin protein (Htt). mHtt protein is thought to adopt one or more toxic conformation(s) that are involved in pathogenic interactions in cells . However, the structure of mHtt is not known. Here, we present a near atomic resolution structure of mHtt36Q-EX1. To facilitate crystallization, three histidine residues (3H) were introduced within the Htt36Q stretch resulting in the sequence of Q 7HQHQHQ 27. The Htt36Q3H region adopts α-helix, loop, β-hairpin conformations. Furthermore, we observed interactions between the backbone of the Htt36Q3H β-strand with the aromatic residues mimicking putative-toxic interactions with other proteins. Our findings support previous predictions that the expanded mHtt-polyQ region adopts a β-sheet structure. Detailed structural information about mHtt improves our understanding of the pathogenic mechanisms in HD and other polyQ expansion disorders and may form the basis for rational design of small molecules that target toxic conformations of disease-causing proteins.

  • Organizational Affiliation

    Department of Physiology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, USA. mwkim@chop.swmed.edu

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Maltose-binding periplasmic protein,Huntingtin
A, B, C
452Escherichia coli K-12Homo sapiens
This entity is chimeric
Mutation(s): 0 
Gene Names: malEb4034JW3994HTTHDIT15
UniProt & NIH Common Fund Data Resources
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
GTEx:  ENSG00000197386 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP42858P0AEX9
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on ZN

Download Ideal Coordinates CCD File 
AA [auth C]
BA [auth C]
CA [auth C]
D [auth A]
DA [auth C]
AA [auth C],
BA [auth C],
CA [auth C],
D [auth A],
DA [auth C],
E [auth A],
EA [auth C],
F [auth A],
FA [auth C],
G [auth A],
GA [auth C],
H [auth A],
HA [auth C],
I [auth A],
IA [auth C],
J [auth A],
JA [auth C],
K [auth A],
KA [auth C],
LA [auth C],
M [auth B],
MA [auth C],
N [auth B],
O [auth B],
P [auth B],
Q [auth B],
R [auth B],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
X [auth B],
Y [auth B],
Z [auth B]
Query on CA

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 2.81 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.239 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 153.182α = 90
b = 177.357β = 108.67
c = 78.346γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2013-03-13 
  • Deposition Author(s): Kim, M.

Revision History  (Full details and data files)

  • Version 1.0: 2013-03-13
    Type: Initial release
  • Version 1.1: 2013-07-03
    Changes: Database references
  • Version 1.2: 2017-06-14
    Changes: Database references, Source and taxonomy, Structure summary
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Derived calculations, Refinement description