3IO4

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.63 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.251 

wwPDB Validation 3D Report Full Report


This is version 2.0 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 fusion protein
A, B, C
449Escherichia 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
CA
Query on CA

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.63 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.251 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 162.950α = 90.00
b = 101.210β = 90.42
c = 142.050γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data collection
PHASESphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-10-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 2.0: 2017-06-21
    Type: Advisory, Atomic model, Database references, Derived calculations, Source and taxonomy, Structure summary