1EJF

CRYSTAL STRUCTURE OF THE HUMAN CO-CHAPERONE P23


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.49 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.236 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 10.1074/jbc.M003410200

  • 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 3 ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROGESTERONE RECEPTOR P23
A, B
125Homo sapiensGene Names: PTGES3 (P23, TEBP)
EC: 5.3.99.3
Find proteins for Q15185 (Homo sapiens)
Go to Gene View: PTGES3
Go to UniProtKB:  Q15185
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.49 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.236 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 61.802α = 90.00
b = 61.802β = 90.00
c = 162.888γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
MLPHAREphasing
MOSFLMdata reduction
CCP4data scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-06-19
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance