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Exploring Flexibility of Progesterone Receptor Ligand Binding Domain Using Molecular Dynamics
Liangzhen Zheng1, Valerie Chunling Lin1, Yuguang Mu1
1School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551, Singapore.
Researchers modeled the apo-form progesterone receptor ligand-binding domain (LBD) using simulations. This reveals flexible regions and distinct conformations, crucial for understanding receptor function and drug discovery.
Area of Science:
- Molecular biology
- Structural biology
- Biochemistry
Background:
- Progesterone receptor (PR) is a nuclear receptor vital for female reproductive tissues.
- Ligand binding induces conformational changes in PR's ligand-binding domain (LBD), affecting gene regulation.
- Understanding PR LBD dynamics is key to its structure-function relationship.
Purpose of the Study:
- To explore the structural dynamics of PR LBD in both ligand-bound and apo-forms.
- To propose a model for the apo-form PR LBD, which has been lacking.
- To identify key residues and structural elements influencing PR LBD dynamics.
Main Methods:
- Molecular dynamics (MD) simulations.
- Advanced sampling techniques, including umbrella sampling and metadynamics.
- Analysis of protein structural flexibility and interactions.
Main Results:
- Helix 11, helix 12, and loop 895-908 are flexible in the antagonistic conformation.
- Salt-bridging interactions involving Arg899 and Glu723 are critical for PR LBD dynamics.
- Apo-form PR LBD helix 12 may not adopt a fully extended conformation, unlike other nuclear receptors.
Conclusions:
- The study provides novel insights into the dynamic conformations of apo-form PR LBD.
- Identified flexible regions and interactions offer targets for therapeutic intervention.
- Generated structural models can facilitate virtual screening for new PR ligands.
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