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Updated: Mar 22, 2026

Detecting the Ligand-binding Domain Dimerization Activity of Estrogen Receptor Alpha Using the Mammalian Two-Hybrid Assay
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Detecting the Ligand-binding Domain Dimerization Activity of Estrogen Receptor Alpha Using the Mammalian Two-Hybrid Assay

Published on: December 19, 2018

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Predictive features of ligand-specific signaling through the estrogen receptor

Jerome C Nwachukwu1, Sathish Srinivasan1, Yangfan Zheng2

  • 1Department of Cancer Biology, The Scripps Research Institute, Jupiter, FL, USA.

Molecular Systems Biology
|April 24, 2016
PubMed

Insights

Researchers identified how estrogen receptor-alpha (ERα) ligands control breast cancer cell proliferation. Biophysical properties of ERα

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Pharmacology

Background:

  • Estrogen receptor-alpha (ERα)-targeted therapies exhibit variable tissue-specific activities in breast cancer treatment.
  • Understanding the biophysical basis of ERα ligand action is crucial for developing effective therapies.

Purpose of the Study:

  • To identify the biophysical determinants governing cell-specific ERα signaling and breast cancer cell proliferation.
  • To correlate ligand structure with ERα activity profiles and cellular responses.

Main Methods:

  • Synthesis of 241 ERα ligands across 19 chemical scaffolds.
  • Quantitative bioassays measuring canonical ERα activities.
  • X-ray crystallography to determine ligand-ERα complex structures.
  • Analysis of coactivator recruitment and gene induction.

Main Results:

  • Ligands modulating the activation function-2 (AF-2) coactivator site showed consistent activity across cell types, predicting proliferation via coactivator NCOA1/2/3 and GREB1 induction.
  • Specific inter-atomic distances within the ligand-binding domain correlated with proliferative effects for certain ligand series.
  • Ligands interacting with the activation function-1 (AF-1) site mediated cell-specific signaling through alternative proliferation mechanisms.

Conclusions:

  • Distinct allosteric signaling outcomes of ERα ligands can be achieved through modulation of either the AF-2 or AF-1 coactivator-binding sites.
  • Systems structural analysis combined with quantitative chemical biology provides insights into ligand-driven ERα function.
  • The study reveals how ligand properties dictate ERα's role in cell-specific breast cancer proliferation.
Keywords:
Breast cancerChemical biologyCrystal structureNuclear receptorSignal transduction

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