Crystal Structure of the human HSBP1

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.195 

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This is version 1.4 of the entry. See complete history


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: https://doi.org/10.1002/prot.22216
  • Primary Citation of Related Structures:  

  • 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 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Heat shock factor-binding protein 1
A, B
48Homo sapiensMutation(s): 1 
Gene Names: HSBP1
UniProt & NIH Common Fund Data Resources
Find proteins for O75506 (Homo sapiens)
Explore O75506 
Go to UniProtKB:  O75506
PHAROS:  O75506
GTEx:  ENSG00000230989 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO75506
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.195 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 35.226α = 90
b = 35.226β = 90
c = 233.266γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
CrystalCleardata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description
  • Version 1.3: 2021-11-10
    Changes: Database references
  • Version 1.4: 2024-05-29
    Changes: Data collection