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Reverse Yeast Two-hybrid System to Identify Mammalian Nuclear Receptor Residues that Interact with Ligands and/or Antagonists
10:51

Reverse Yeast Two-hybrid System to Identify Mammalian Nuclear Receptor Residues that Interact with Ligands and/or Antagonists

Published on: November 15, 2013

Nuclear receptor and transcriptional complex cycles

Amy M Fowler1, Elaine T Alarid

  • 1University of Wisconsin-Madison, Department of Physiology, 1300 University Avenue, Madison, WI 53706, USA.

Science'S STKE : Signal Transduction Knowledge Environment
|December 9, 2004
PubMed

Insights

Ligand-activated nuclear receptors dynamically regulate gene expression. This study visualizes the estrogen receptor

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Nuclear receptors, or steroid receptors, are intracellular proteins crucial for transcriptional regulation.
  • These receptors bind to lipid-soluble ligands, mediating interactions with gene promoters and co-regulators.
  • The dynamic nature of nuclear receptor-mediated gene expression remains an area of active research.

Purpose of the Study:

  • To visualize the dynamic interactions of nuclear receptors with DNA and chromatin.
  • To illustrate the molecular events governing transcriptional regulation by ligand-activated receptors.

Main Methods:

  • Utilized experimental data to create an animation depicting receptor-DNA dynamics.
  • Focused on the glucocorticoid receptor and estrogen receptor interactions with DNA.
  • Visualized the estrogen receptor's interaction with a two-nucleosome chromatin fragment.

Main Results:

  • The animation demonstrates the ordered recruitment of protein components to form macromolecular complexes.
  • Visual representation of nuclear estrogen receptor binding to chromatin in the presence and absence of estrogen.
  • Detailed description of participating proteins and complexes in nuclear receptor-chromatin cycles provided in an associated table.

Conclusions:

  • Ligand binding induces dynamic conformational changes and interactions of nuclear receptors with chromatin.
  • The study provides a visual model for understanding the step-wise assembly of transcriptional machinery.
  • Elucidates the molecular mechanisms underlying ligand-dependent transcriptional regulation by nuclear receptors.

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