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Updated: Aug 30, 2026

Prediction and Validation of Gene Regulatory Elements Activated During Retinoic Acid Induced Embryonic Stem Cell Differentiation
09:07

Prediction and Validation of Gene Regulatory Elements Activated During Retinoic Acid Induced Embryonic Stem Cell Differentiation

Published on: June 21, 2016

PLZF is a negative regulator of retinoic acid receptor transcriptional activity

Perrine J Martin1, Marie-Hélène Delmotte, Pierre Formstecher

  • 1INSERM U 459 and Ligue Nationale Contre le Cancer, Faculté de Médecine Henri Warembourg, 1 place de Verdun, 59045 Lille cedex, France. p.lefebvre@lille.inserm.fr

Nuclear Receptor
|October 3, 2003
PubMed

Insights

Promyelocytic leukemia zinc finger protein (PLZF) physically interacts with retinoic acid receptors (RARs) independently of ligands. This interaction inhibits RAR transcriptional activity by preventing receptor heterodimerization, revealing a new regulatory mechanism.

Area of Science:

  • Molecular Biology
  • Gene Regulation

Background:

  • Retinoic acid receptors (RARs) are key transcription factors regulating cell proliferation and differentiation.
  • Interactions with coregulators modulate RAR activity upon ligand binding.
  • Mechanisms controlling ligand-independent RAR activity by intermediary factors are poorly understood.

Purpose of the Study:

  • To identify and characterize novel proteins interacting with RARs in a ligand-independent manner.
  • To elucidate the functional consequences of RAR interaction with PLZF on transcriptional activity.
  • To investigate the mechanism by which PLZF affects RAR function.

Main Methods:

  • Yeast two-hybrid assays to identify protein interactions.
  • GST-pull down assays to confirm and map protein binding domains.
  • Reporter gene assays to assess transcriptional activity.
  • In vitro and cellular assays to study protein complex formation.

Main Results:

  • PLZF, a transcriptional corepressor, was identified as a RAR-interacting protein.
  • The N-terminal zinc finger domain of PLZF mediates binding to the RAR ligand-binding domain.
  • PLZF interaction with RARs is ligand-independent and reduces RXR-RAR heterodimer transcriptional activity.
  • PLZF inhibits RXR-RAR heterodimerization in vitro and in cells.

Conclusions:

  • RARs and PLZF interact physically and functionally.
  • PLZF acts as a novel regulator of RAR activity by inhibiting heterodimerization.
  • This interaction provides a new mechanism for controlling RAR transcriptional function.

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