3IOT

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.247 

wwPDB Validation 3D Report Full Report


This is version 1.4 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:  

  • 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 e ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Maltose-binding periplasmic protein,Huntingtin
A, B, C
449Homo sapiensEscherichia coli (strain K12)
This entity is chimeric
Mutation(s): 0 
Gene Names: HTT (HD, IT15), malE
Find proteins for P42858 (Homo sapiens)
Go to Gene View: HTT
Go to UniProtKB:  P42858
Find proteins for P0AEX9 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEX9
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
CA
Query on CA

Download SDF File 
Download CCD File 
A, B, C
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.247 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 163.250α = 90.00
b = 101.360β = 91.83
c = 137.030γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data scaling
REFMACrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2009-08-14 
  • Released Date: 2009-09-29 
  • Deposition Author(s): Kim, M.W.

Revision History 

  • Version 1.0: 2009-09-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2012-06-06
    Type: Database references, Derived calculations
  • Version 1.3: 2015-06-24
    Type: Source and taxonomy
  • Version 1.4: 2017-06-28
    Type: Advisory, Database references, Refinement description, Source and taxonomy, Structure summary