Experimental Data Snapshot

  • Resolution: 2.49 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 

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This is version 1.4 of the entry. See complete history


Crystal structure and activity of human p23, a heat shock protein 90 co-chaperone.

Weaver, A.J.Sullivan, W.P.Felts, S.J.Owen, B.A.Toft, D.O.

(2000) J Biol Chem 275: 23045-23052

  • DOI: https://doi.org/10.1074/jbc.M003410200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    p23 is a co-chaperone for the heat shock protein, hsp90. This protein binds hsp90 and participates in the folding of a number of cell regulatory proteins, but its activities are still unclear. We have solved a crystal structure of human p23 lacking 35 residues at the COOH terminus. The structure reveals a disulfide-linked dimer with each subunit containing eight beta-strands in a compact antiparallel beta-sandwich fold. In solution, however, p23 is primarily monomeric and the dimer appears to be a minor component. Conserved residues are clustered on one face of the monomer and define a putative surface region and binding pocket for interaction(s) with hsp90 or protein substrates. p23 contains a COOH-terminal tail that is apparently less structured and is unresolved in the crystal structure. This tail is not needed for the binding of p23 to hsp90 or to complexes with the progesterone receptor. However, the tail is necessary for optimum active chaperoning of the progesterone receptor, as well as the passive chaperoning activity of p23 in assays measuring inhibition of heat-induced protein aggregation.

  • Organizational Affiliation

    hkl Research, Inc., Ithaca, New York 14853, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Prostaglandin E synthase 3
A, B
125Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q15185 (Homo sapiens)
Explore Q15185 
Go to UniProtKB:  Q15185
GTEx:  ENSG00000110958 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15185
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.49 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.802α = 90
b = 61.802β = 90
c = 162.888γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-06-19
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-12-18
    Changes: Data collection, Derived calculations
  • Version 1.4: 2020-10-28
    Changes: Derived calculations, Structure summary