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: 2.80 Å
  • R-Value Free: 0.324 
  • R-Value Work: 0.265 
  • R-Value Observed: 0.320 

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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
  • Primary Citation of Related Structures:  
    2QA7

  • 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 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 ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Huntingtin-interacting protein 1A, B, C, D114Homo sapiensMutation(s): 0 
Gene Names: HIP1
Find proteins for O00291 (Homo sapiens)
Explore O00291 
Go to UniProtKB:  O00291
NIH Common Fund Data Resources
PHAROS:  O00291
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.324 
  • R-Value Work: 0.265 
  • R-Value Observed: 0.320 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.9α = 90
b = 72.9β = 90
c = 106.5γ = 90
Software Package:
Software NamePurpose
d*TREKdata scaling
RESOLVEphasing
CNSrefinement
PDB_EXTRACTdata extraction
CrystalCleardata collection
d*TREKdata reduction
SOLVEphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

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

Revision History  (Full details and data files)

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