5W9D

Estrogen Receptor Alpha Ligand Binding Domain C381S, C417S, C530S Mutant in Complex with Endoxifen


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6464 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.168 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Endoxifen, 4-Hydroxytamoxifen and an Estrogenic Derivative Modulate Estrogen Receptor Complex Mediated Apoptosis in Breast Cancer.

Maximov, P.Y.Abderrahman, B.Fanning, S.W.Sengupta, S.Fan, P.Curpan, R.F.Rincon, D.M.Q.Greenland, J.A.Rajan, S.S.Greene, G.L.Jordan, V.C.

(2018) Mol. Pharmacol. 94: 812-822

  • DOI: 10.1124/mol.117.111385
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Estrogen therapy was used to treat advanced breast cancer in postmenopausal women for decades until the introduction of tamoxifen. Resistance to long-term estrogen deprivation (LTED) with tamoxifen and aromatase inhibitors used as a treatment for bre ...

    Estrogen therapy was used to treat advanced breast cancer in postmenopausal women for decades until the introduction of tamoxifen. Resistance to long-term estrogen deprivation (LTED) with tamoxifen and aromatase inhibitors used as a treatment for breast cancer inevitably occurs, but unexpectedly low dose estrogen can cause regression of breast cancer and increase disease free survival in some patients. This therapeutic effect is attributed to estrogen-induced apoptosis in LTED breast cancer. Here we describe modulation of the estrogen receptor liganded with antiestrogens (endoxifen, 4-hydroxytamoxifen) and an estrogenic triphenylethylene (TPE) EthoxyTPE (EtOXTPE) on estrogen-induced apoptosis in LTED breast cancer cells. Our results show that the angular TPE estrogen (EtOXTPE) is able to induce the ER-mediated apoptosis only at a later time compared to planar estradiol in these cells. Using RT-PCR, ChIP, Western blotting, molecular modelling and X-ray crystallography techniques we report novel conformations of the ER complex with an angular estrogen EtOXTPE and endoxifen. We propose that alteration of the conformation of the ER complexes, with changes in coactivator binding, governs estrogen-induced apoptosis through the PERK sensor system to trigger an Unfolded Protein Response (UPR).


    Organizational Affiliation

    University of Texas MD Anderson Cancer Center.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Estrogen receptor
A, B
249Homo sapiensMutation(s): 3 
Gene 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
9XY
Query on 9XY

Download SDF File 
Download CCD File 
A, B
Endoxifen
4-[(1Z)-1-{4-[2-(methylamino)ethoxy]phenyl}-2-phenylbut-1-en-1-yl]phenol
C25 H27 N O2
MHJBZVSGOZTKRH-IZHYLOQSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6464 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.168 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 57.980α = 90.00
b = 57.980β = 90.00
c = 277.001γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXphasing
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-10-11
    Type: Initial release
  • Version 1.1: 2018-06-13
    Type: Data collection, Database references
  • Version 1.2: 2018-07-04
    Type: Data collection, Database references