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Updated: Aug 11, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Estrogen receptor-alpha binds p53 tumor suppressor protein directly and represses its function

Wensheng Liu1, Santhi D Konduri, Sanjay Bansal

  • 1Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Elm & Carlton Sts., Buffalo, NY 14263, USA.

The Journal of Biological Chemistry
|February 14, 2006
PubMed

Insights

Estrogen receptor-alpha (ERalpha) directly binds and represses tumor suppressor p53. This interaction is disrupted by radiation, revealing a novel mechanism in breast cancer cell proliferation.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Estrogen receptor-alpha (ERalpha) drives breast cancer cell proliferation.
  • Tumor suppressor p53 inhibits proliferation in cells with genomic damage.
  • The direct interaction between ERalpha and p53 pathways was previously unclear.

Purpose of the Study:

  • To investigate the direct link between ERalpha and p53 pathways.
  • To elucidate the mechanism by which ERalpha influences p53 function.
  • To understand the role of this interaction in breast cancer progression.

Main Methods:

  • Investigated ERalpha-p53 interaction using biochemical assays.
  • Utilized small interfering RNA (siRNA) to knock down p53 and ERalpha.
  • Assessed p53-target gene expression and cell cycle progression.
  • Examined the effect of ionizing radiation on the ERalpha-p53 interaction.

Main Results:

  • ERalpha directly binds to p53, repressing its tumor-suppressive function.
  • The interaction involves ERalpha's AF-2 domain and p53's C-terminal domain.
  • Knocking down ERalpha or p53 had opposing effects on gene expression and cell cycle.
  • Ionizing radiation disrupted the ERalpha-p53 interaction.
  • Combined ERalpha knockdown and radiation enhanced p53-target gene p21 transcription.

Conclusions:

  • ERalpha directly suppresses p53 activity, contributing to its pro-proliferative role in breast cancer.
  • Disruption of the ERalpha-p53 interaction by DNA damage is a key regulatory mechanism.
  • Targeting the ERalpha-p53 interaction may offer novel therapeutic strategies for breast cancer.

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