3CI9

Crystal Structure of the human HSBP1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the hexamer of human heat shock factor binding protein 1

Liu, X.Xu, L.Liu, Y.Tong, X.Zhu, G.Zhang, X.C.Li, X.Rao, Z.

(2009) Proteins 75: 1-11

  • DOI: 10.1002/prot.22216

  • PubMed Abstract: 
  • Heat shock response (HSR) is a ubiquitous cellular mechanism that copes with a variety of stresses. This response is mediated by a family of transcriptional activators, heat shock factors (HSFs), which are under tight regulation. HSF binding protein ...

    Heat shock response (HSR) is a ubiquitous cellular mechanism that copes with a variety of stresses. This response is mediated by a family of transcriptional activators, heat shock factors (HSFs), which are under tight regulation. HSF binding protein 1 (HSBP1) is a negative regulator of HSR and is reported to bind specifically with the active trimeric form of HSF1, thus inhibiting its activity. HSBP1 contains heptad-repeats in the primary sequence and was believed to stay in a trimer form in solution. We report the crystal structure of the trimerization domain of the M30I/L55P mutant of human HSBP1 at 1.8 A resolution. In this crystal form, the HSBP1 fragment of residues 6-53 forms a continuous, 11-turn long helix. The helix self-associates to form a parallel, symmetrical, triple coiled-coil helix bundle, which further assembles into a dimer of trimers in a head-to-head fashion. Solution study confirmed that the wild-type HSBP1 shares similar biophysical properties with the crystallized variant. Furthermore, we identified Ser31, which buried its polar side chain in the hydrophobic interior of the helix bundle, as a stability weak-spot. Substitution of this residue with Ile increases the melting temperature by 24 degrees C, implicating that this conserved serine residue is maintained at position 31 for functional purposes.


    Organizational Affiliation

    National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Heat shock factor-binding protein 1
A, B
48Homo sapiensMutation(s): 1 
Gene Names: HSBP1 (HSF1BP)
Find proteins for O75506 (Homo sapiens)
Go to Gene View: HSBP1
Go to UniProtKB:  O75506
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.195 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 35.226α = 90.00
b = 35.226β = 90.00
c = 233.266γ = 120.00
Software Package:
Software NamePurpose
SOLVEphasing
CrystalCleardata collection
DENZOdata reduction
PDB_EXTRACTdata extraction
RESOLVEphasing
HKL-2000data reduction
HKL-2000data scaling
SCALEPACKdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-01-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-10-25
    Type: Refinement description