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Updated: May 25, 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

Serine-305 phosphorylation modulates estrogen receptor alpha binding to a coregulator peptide array, with potential

René Houtman1, Renée de Leeuw, Mariska Rondaij

  • 1PamGene International BV, Den Bosch, The Netherlands. r.houtman@pamgene.com

Molecular Cancer Therapeutics
|February 10, 2012
PubMed

Insights

A new peptide array can detect estrogen receptor alpha (ERα) binding, aiding in identifying tamoxifen resistance. This tool helps predict patient response to breast cancer therapies, enabling personalized treatment strategies.

Area of Science:

  • Molecular biology
  • Endocrinology
  • Cancer research

Background:

  • Assessing coregulator binding for nuclear receptors like estrogen receptor alpha (ERα) is challenging.
  • ERα is crucial in breast tumors and targeted by antiestrogens like tamoxifen.
  • ERα modifications, including phosphorylation at Ser305, contribute to tamoxifen resistance.

Purpose of the Study:

  • To develop a high-throughput method for analyzing ERα coregulator binding.
  • To investigate the impact of ERα phosphorylation on coregulator interactions.
  • To assess the potential of this method for detecting tamoxifen resistance in clinical samples.

Main Methods:

  • Development of a coregulator peptide array for analyzing ERα binding.
  • Testing the peptide chip with cell and tumor lysates.
  • Comparing ERα binding in phosphorylated versus non-phosphorylated states.

Main Results:

  • The coregulator peptide array successfully detected ERα binding in cell and tumor lysates.
  • ERα phosphorylated at Ser305 showed stronger association with various coregulator peptides.
  • This phosphorylation-dependent binding was observed in a tamoxifen-insensitive breast tumor sample.

Conclusions:

  • ERαSer305 phosphorylation enhances estrogen receptor function and coregulator interactions.
  • The developed peptide array can detect tamoxifen resistance in breast tumor samples.
  • This technology may facilitate early detection of resistance and support personalized medicine approaches in breast cancer treatment.

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