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Published on: December 19, 2018
Effect of heterodimer partner RXRalpha on PPARgamma activation function-2 helix in solution
Jianyun Lu1, Minghe Chen, Susan E Stanley
1Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA. lujy@wustl.edu
Nuclear magnetic resonance (NMR) reveals how retinoid X receptor (RXR) binding influences peroxisome proliferator-activated receptor gamma (PPARgamma). This study provides insights into allosteric ligand activation in RXR heterodimers.
Area of Science:
- Molecular Biology
- Structural Biology
- Biochemistry
Background:
- The mechanism of allosteric communication in retinoid X receptor (RXR) heterodimers is not fully understood.
- Understanding these interactions is crucial for deciphering gene regulation and developing targeted therapies.
Purpose of the Study:
- To investigate the structural basis of allosteric communication between RXR and its heterodimer partners.
- To establish nuclear magnetic resonance (NMR) assignments for the peroxisome proliferator-activated receptor gamma (PPARgamma) ligand-binding domain (LBD).
Main Methods:
- Nuclear magnetic resonance (NMR) spectroscopy was employed to study the PPARgamma LBD.
- Resonance assignments (13C(alpha), 13C(beta), 13CO, 1HN, 15N) were established for over 95% of the PPARgamma LBD monomer.
- Chemical shift perturbations were analyzed upon binding of the 9-cis-retinoic acid (9cRA)-bound RXRalpha LBD.
Main Results:
- Sequence-specific resonance assignments for the PPARgamma LBD were successfully obtained.
- RXRalpha LBD binding induced chemical shift perturbations at the heterodimer interface and within the activation function-2 (AF-2) helix of PPARgamma.
- These changes indicate that bound RXRalpha influences the PPARgamma AF-2 helix in solution.
Conclusions:
- NMR is a powerful technique for studying allosteric ligand activation in RXR heterodimers.
- The findings suggest a direct effect of RXRalpha on the PPARgamma AF-2 helix, providing mechanistic insights into allosteric communication.
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