4FEB

Crystal Structure of Htt36Q3H-EX1-X1-C2(Beta)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 10.4161/pri.23807
  • Primary Citation of Related Structures:  

  • 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 ar ...

    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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Maltose-binding periplasmic protein,Huntingtin
A, B, C
452Escherichia coli O157:H7Homo sapiens
This entity is chimeric
Mutation(s): 0 
Gene Names: malE, HTT (HD, IT15)
Find proteins for P0AEY0 (Escherichia coli O157:H7)
Go to UniProtKB:  P0AEY0
Find proteins for P42858 (Homo sapiens)
Go to Gene View: HTT
Go to UniProtKB:  P42858
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B, C
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.229 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 155.052α = 90.00
b = 177.278β = 109.03
c = 78.868γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
REFMACrefinement
SCALEPACKdata scaling
HKL-2000data reduction
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-05-29 
  • Released Date: 2013-03-13 
  • Deposition Author(s): Kim, M.

Revision History 

  • Version 1.0: 2013-03-13
    Type: Initial release
  • Version 1.1: 2013-07-03
    Type: Database references
  • Version 1.2: 2017-06-07
    Type: Database references