1R5K

Human Estrogen Receptor alpha Ligand-Binding Domain In Complex With GW5638


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for an unexpected mode of SERM-mediated ER antagonism.

Wu, Y.L.Yang, X.Ren, Z.McDonnell, D.P.Norris, J.D.Willson, T.M.Greene, G.L.

(2005) Mol.Cell 18: 413-424

  • DOI: 10.1016/j.molcel.2005.04.014

  • PubMed Abstract: 
  • Tamoxifen is effective for the prevention and treatment of estrogen-dependent breast cancers, but is associated with an increased incidence of endometrial tumors. We report the crystal structure of the estrogen receptor alpha (ERalpha) ligand binding ...

    Tamoxifen is effective for the prevention and treatment of estrogen-dependent breast cancers, but is associated with an increased incidence of endometrial tumors. We report the crystal structure of the estrogen receptor alpha (ERalpha) ligand binding domain (LBD) bound to the structurally similar compound GW5638, which has therapeutic potential and does not stimulate the uterus. Like tamoxifen, GW5638 relocates the carboxy-terminal helix (H12) to the known coactivator-docking site in the ERalpha LBD. However, GW5638 repositions residues in H12 through specific contacts with the N terminus of this helix. In contrast to tamoxifen, the resulting increase in exposed hydrophobic surface of ERalpha LBD correlates with a significant destabilization of ERalpha in MCF-7 cells. Thus, the GW5638-ERalpha LBD structure reveals an unexpected mode of SERM-mediated ER antagonism, in which the stability of ERalpha is decreased through an altered position of H12. This dual mechanism of antagonism may explain why GW5638 can inhibit tamoxifen-resistant breast tumors.


    Organizational Affiliation

    The Ben May Institute for Cancer Research and Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois 60637, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Estrogen receptor
A, B, C
261Homo sapiensGene Names: ESR1 (ESR, NR3A1)
Find proteins for P03372 (Homo sapiens)
Go to Gene View: ESR1
Go to UniProtKB:  P03372
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GW5
Query on GW5

Download SDF File 
Download CCD File 
A, B, C
(2E)-3-{4-[(1E)-1,2-DIPHENYLBUT-1-ENYL]PHENYL}ACRYLIC ACID
GW5638, DPC 974
C25 H22 O2
HJQQVNIORAQATK-DDJBQNAASA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
GW5IC50: 3.2 - 4000 nM (100) BINDINGDB
GW5EC50: 390 nM (100) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.205 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 136.031α = 90.00
b = 136.031β = 90.00
c = 357.626γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
EPMRphasing
REFMACrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-11-23
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance