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Related Experiment Videos

Interdomain communication regulating ligand binding by PPAR-gamma

D Shao1, S M Rangwala, S T Bailey

  • 1Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104, USA.

Nature
|December 9, 1998
PubMed
Summary
This summary is machine-generated.

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Peroxisome proliferator-activated receptor gamma (PPAR-gamma) ligand binding is regulated by its amino-terminal domain. This interaction impacts adipocyte differentiation and insulin sensitivity, influencing therapeutic ligand development.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Endocrinology

Background:

  • Nuclear hormone receptors, like PPAR-gamma, are critical for cellular processes including adipocyte differentiation and insulin sensitivity.
  • PPAR-gamma ligands, including fatty acid derivatives and drugs, modulate various physiological functions and are investigated for therapeutic potential.
  • Ligand binding is a key function of nuclear receptors, primarily associated with their ligand-binding domain (LBD).

Purpose of the Study:

  • To investigate the regulation of ligand binding by PPAR-gamma.
  • To determine the role of intramolecular communication between different domains of PPAR-gamma in modulating ligand affinity.
  • To understand how modifications to the amino-terminal domain affect PPAR-gamma's transcriptional activity and biological functions.

Main Methods:

Related Experiment Videos

  • Utilized biochemical assays to assess ligand-binding affinity of PPAR-gamma.
  • Investigated the effects of modifications to the amino-terminal A/B domain on ligand binding.
  • Examined the impact of MAP kinase-mediated phosphorylation on PPAR-gamma function.

Main Results:

  • Ligand binding to PPAR-gamma is regulated by intramolecular communication between the amino-terminal A/B domain and the carboxy-terminal LBD.
  • Phosphorylation of the A/B domain by MAP kinase significantly reduces ligand-binding affinity.
  • This negative regulation by the A/B domain impacts PPAR-gamma's transcriptional and biological activities.

Conclusions:

  • The amino-terminal A/B domain plays a crucial role in regulating ligand binding to PPAR-gamma.
  • Intramolecular communication is essential for controlling PPAR-gamma's response to ligands.
  • These findings have significant implications for evaluating therapeutic ligands targeting PPAR-gamma and other nuclear receptors.