2FSZ

A second binding site for hydroxytamoxifen within the coactivator-binding groove of estrogen receptor beta


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.273 
  • R-Value Observed: 0.274 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

A second binding site for hydroxytamoxifen within the coactivator-binding groove of estrogen receptor beta

Wang, Y.Chirgadze, N.Y.Briggs, S.L.Khan, S.Jensen, E.V.Burris, T.P.

(2006) Proc Natl Acad Sci U S A 103: 9908-9911

  • DOI: 10.1073/pnas.0510596103
  • Primary Citation of Related Structures:  
    2FSZ

  • PubMed Abstract: 
  • Evidence is presented that the estrogen antagonist 4-hydroxytamoxifen (HT) can occupy not only the core binding pocket within the ligand-binding domain of estrogen receptor (ER) beta but also a second site on its surface. The crystal structure of the ...

    Evidence is presented that the estrogen antagonist 4-hydroxytamoxifen (HT) can occupy not only the core binding pocket within the ligand-binding domain of estrogen receptor (ER) beta but also a second site on its surface. The crystal structure of the ligand-binding domain (LBD) associated with HT was determined to 2.2 A and revealed two molecules of HT bound to the protein. One was located in the consensus ligand-binding pocket, whereas the other bound to a site that overlaps with the hydrophobic groove of the coactivator recognition surface. Relative to the ERalpha-tamoxifen structure, helix 12 has been displaced from the coactivator recognition surface and occupies a unique position. Although it has been demonstrated that association of the antagonist with the core ligand-binding pocket is sufficient to induce an antagonist ligand-binding domain conformation, this structure suggests that small molecules may directly antagonize receptor-coactivator interactions. These results provide a direct demonstration of two binding sites for HT in ERbeta, as has been previously suggested for ERalpha by using biochemical methods, and represent a crystal structure of a small nonpeptide molecule occupying the coactivator recognition site.


    Organizational Affiliation

    Lilly Research Laboratories, Indianapolis, IN 46285, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Estrogen receptor betaAB246Homo sapiensMutation(s): 3 
Gene Names: ESR2ESTRBNR3A2
Find proteins for Q92731 (Homo sapiens)
Explore Q92731 
Go to UniProtKB:  Q92731
NIH Common Fund Data Resources
PHAROS  Q92731
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OHT
Query on OHT

Download CCD File 
A, B
4-HYDROXYTAMOXIFEN
C26 H29 N O2
TXUZVZSFRXZGTL-QPLCGJKRSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
OHTEC50:  32   nM  BindingDB
OHTKi:  1.7000000476837158   nM  BindingDB
OHTEC50:  6   nM  BindingDB
OHTIC50:  20   nM  BindingDB
OHTIC50:  21   nM  BindingDB
OHTKi:  0.5   nM  BindingDB
OHTKi:  0.009999999776482582   nM  BindingDB
OHTKi:  0.1599999964237213   nM  BindingDB
OHTIC50:  2.5999999046325684   nM  BindingDB
OHTIC50:  100   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.273 
  • R-Value Observed: 0.274 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.04α = 90
b = 105.04β = 90
c = 102.391γ = 90
Software Package:
Software NamePurpose
CNSrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling
AMoREphasing
CNXrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2006-01-23 
  • Released Date: 2006-07-11 
  • Deposition Author(s): Wang, Y.

Revision History 

  • Version 1.0: 2006-07-11
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-24
    Changes: Structure summary