2QA7

Crystal structure of Huntingtin-interacting protein 1 (HIP1) coiled-coil domain with a basic surface suitable for HIP-protein interactor (HIPPI)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.324 
  • R-Value Work: 0.265 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structure at 2.8 A of Huntingtin-interacting protein 1 (HIP1) coiled-coil domain reveals a charged surface suitable for HIP1 protein interactor (HIPPI)

Ybe, J.A.Niu, Q.

(2007) J.Mol.Biol. 375: 1197-1205

  • DOI: 10.1016/j.jmb.2007.11.036

  • PubMed Abstract: 
  • Huntington's disease is a genetic neurological disorder that is triggered by the dissociation of the huntingtin protein (htt) from its obligate interaction partner Huntingtin-interacting protein 1 (HIP1). The release of the huntingtin protein permits ...

    Huntington's disease is a genetic neurological disorder that is triggered by the dissociation of the huntingtin protein (htt) from its obligate interaction partner Huntingtin-interacting protein 1 (HIP1). The release of the huntingtin protein permits HIP1 protein interactor (HIPPI) to bind to its recognition site on HIP1 to form a HIPPI/HIP1 complex that recruits procaspase-8 to begin the process of apoptosis. The interaction module between HIPPI and HIP1 was predicted to resemble a death-effector domain. Our 2.8-A crystal structure of the HIP1 371-481 subfragment that includes F432 and K474, which is important for HIPPI binding, is not a death-effector domain but is a partially opened coiled coil. The HIP1 371-481 model reveals a basic surface that we hypothesize to be suitable for binding HIPPI. There is an opened region next to the putative HIPPI site that is highly negatively charged. The acidic residues in this region are highly conserved in HIP1 and a related protein, HIP1R, from different organisms but are not conserved in the yeast homologue of HIP1, sla2p. We have modeled approximately 85% of the coiled-coil domain by joining our new HIP1 371-481 structure to the HIP1 482-586 model (Protein Data Bank code: 2NO2). Finally, the middle of this coiled-coil domain may be intrinsically flexible and suggests a new interaction model where HIPPI binds to a U-shaped HIP1 molecule.


    Organizational Affiliation

    Department of Biology, Indiana University, Simon Hall 405B, 212 S. Hawthorne Drive, Bloomington, IN 47405, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Huntingtin-interacting protein 1
A, B, C, D
114Homo sapiensMutation(s): 0 
Gene Names: HIP1
Find proteins for O00291 (Homo sapiens)
Go to Gene View: HIP1
Go to UniProtKB:  O00291
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.324 
  • R-Value Work: 0.265 
  • Space Group: P 43
Unit Cell:
Length (Å)Angle (°)
a = 72.900α = 90.00
b = 72.900β = 90.00
c = 106.500γ = 90.00
Software Package:
Software NamePurpose
RESOLVEphasing
PDB_EXTRACTdata extraction
d*TREKdata reduction
CrystalCleardata collection
SOLVEphasing
CNSrefinement
d*TREKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-06-14 
  • Released Date: 2008-07-08 
  • Deposition Author(s): Niu, Q., Ybe, J.A.

Revision History 

  • Version 1.0: 2008-07-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance