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Updated: Aug 19, 2025
NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode
Published on: June 4, 2021
[A Screening System for the Identification of Fragment Molecules toward the Creation of Nuclear Receptor Ligands]
1Faculty of Life and Environmental Sciences, University of Tsukuba.
Abstract:
Peroxisome proliferator-activated receptor γ (PPARγ) is a member of the nuclear receptor superfamily, which plays an important role in glucose and lipid metabolism as well as inflammation. The transcriptional activity of PPARγ is regulated by the binding of its ligand and the accompanied conformational change followed by the recruitment of cofactors. The ligand-binding pocket (LBP) of PPARγ comprises multiple sub-pockets and includes a large, Y-shaped cavity. In some cases, more than two ligands simultaneously occupy the LBP and cooperatively activate PPARγ transcription. Inspired by this peculiar character, the author proposed a strategy to create new PPARγ ligands in two steps: first, identifying a combination of ligands that cooperatively activate PPARγ, and second, designing and synthesizing their hybrid structure. Cooperative activation can be detected by a conventional cell-based assay using a reporter gene, which may provide advantages over the existing fragment-based drug discovery approach. Using this strategy, a plant-derived cinnamic acid derivative was found to synergistically activate PPARγ in combination with GW9662, an irreversible antagonist. The designed hybrid structure was synthesized and found to behave as a covalent agonist, which partially activates PPARγ transcription. Structure-activity studies revealed the importance of proximity and orientation in the linkage of the two units. The strategy discussed in this article may contribute to the development of a highly potent PPARγ agonist.
Insights
Researchers developed a novel strategy to create potent Peroxisome proliferator-activated receptor gamma (PPARγ) agonists by designing hybrid ligands that cooperatively activate the receptor, offering a new approach for drug discovery.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Context:
- Peroxisome proliferator-activated receptor gamma (PPARγ) is a nuclear receptor crucial for regulating glucose and lipid metabolism and inflammation.
- PPARγ's ligand-binding pocket (LBP) can accommodate multiple ligands, enabling cooperative transcriptional activation.
- Existing fragment-based drug discovery methods have limitations.
Purpose:
- To propose and validate a novel two-step strategy for designing hybrid PPARγ ligands.
- To identify ligand combinations that cooperatively activate PPARγ.
- To synthesize and characterize hybrid structures for potential therapeutic applications.
Summary:
- A new strategy involves identifying cooperative ligand pairs for PPARγ activation and synthesizing their hybrid structures.
- A plant-derived cinnamic acid derivative synergistically activated PPARγ with GW9662, an antagonist.
- The resulting hybrid molecule acted as a covalent agonist, partially activating PPARγ transcription, with structure-activity relationships highlighting linkage importance.
Impact:
- This approach may lead to the development of highly potent PPARγ agonists.
- The strategy offers potential advantages over current fragment-based drug discovery methods.
- Findings contribute to understanding PPARγ ligand interactions and developing new therapeutic agents for metabolic and inflammatory diseases.
