Related Experiment Video

Updated: May 11, 2026

Detecting the Ligand-binding Domain Dimerization Activity of Estrogen Receptor Alpha Using the Mammalian Two-Hybrid Assay
09:07

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

Published on: December 19, 2018

Interaction of 14-3-3 proteins with the estrogen receptor alpha F domain provides a drug target interface

Ingrid J De Vries-van Leeuwen1, Daniel da Costa Pereira, Koen D Flach

  • 1Department of Structural Biology, Faculty Earth and Life Sciences, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands.

Proceedings of the National Academy of Sciences of the United States of America
|May 17, 2013
PubMed

Insights

New research reveals how 14-3-3 proteins regulate estrogen receptor alpha (ERα) dimerization. The small molecule fusicoccin stabilizes this interaction, offering a novel therapeutic strategy for breast cancer treatment.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cancer Research

Background:

  • Estrogen receptor alpha (ERα) is a key target in breast cancer therapy.
  • Current treatments include aromatase inhibitors and antiestrogens, but drug resistance necessitates new approaches.
  • ERα dimerization is crucial for its activity, making it a potential drug target.

Purpose of the Study:

  • To elucidate a novel mechanism controlling ERα dimerization via 14-3-3 protein interaction.
  • To investigate the role of the small molecule fusicoccin (FC) in modulating ERα/14-3-3 binding.
  • To provide a structural basis for ERα/14-3-3 interaction stabilization and its therapeutic implications.

Main Methods:

  • Cocrystallization of the ERα/14-3-3/fusicoccin complex.
  • Phosphorylation site analysis using a phospho-T(594)-specific antibody and mass spectrometry.
  • Assessment of fusicoccin's effect on ERα dimerization, chromatin interaction, gene expression, and cell proliferation in MCF-7 cells.

Main Results:

  • A unique ERα dimerization inhibition mechanism involving 14-3-3 proteins at the C terminus was identified.
  • Fusicoccin was shown to stabilize the ERα/14-3-3 interaction, dependent on ERα phosphorylation at T(594).
  • Fusicoccin treatment decreased ERα dimerization, ERα/chromatin binding, downstream gene expression, and MCF-7 cell proliferation.

Conclusions:

  • A novel functional phosphosite (T(594)) and an alternative ERα regulation mechanism involving 14-3-3 proteins were discovered.
  • Fusicoccin selectively targets the ERα/14-3-3 interface, representing a promising new therapeutic strategy for breast cancer.
  • This study provides a structural and mechanistic basis for developing novel ERα-targeted therapies.

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