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Interfacial Binding Sites for Cholesterol on G Protein-Coupled Receptors
1School of Biological Sciences, University of Southampton, Southampton, United Kingdom.
Biophysical Journal
|April 24, 2019
Summary
A new docking procedure identifies cholesterol binding sites on G protein-coupled receptors (GPCRs). This method accurately predicts known cholesterol positions and reveals how receptor tilt and thermal motion influence binding pockets.
Area of Science:
- Biochemistry
- Structural Biology
- Computational Chemistry
Background:
- G protein-coupled receptors (GPCRs) are crucial membrane proteins involved in numerous cellular processes.
- Cholesterol plays a significant role in modulating GPCR structure and function.
- Identifying specific cholesterol binding sites on GPCRs is essential for understanding their mechanisms.
Purpose of the Study:
- To develop and validate a computational docking procedure for identifying cholesterol binding sites on the transmembrane domain of GPCRs.
- To investigate the influence of GPCR orientation and dynamics on cholesterol binding.
Main Methods:
- A novel docking protocol was employed to screen the GPCR transmembrane surface for potential cholesterol binding sites.
- The procedure was validated against known cholesterol interactions in published GPCR crystal structures.
- Analysis of docking pose clustering and dependence on receptor tilt angle.
Main Results:
- The docking procedure successfully identified 89% of validated cholesterol binding sites in known GPCR structures.
- Distinct clusters of docking poses were observed, corresponding to hydrophobic pockets ('greasy hollows') on the receptor surface.
- The tilt angle of the GPCR within the lipid bilayer significantly influenced the location and nature of predicted binding sites.
Conclusions:
- The developed docking procedure provides a reliable method for mapping cholesterol interactions with GPCRs.
- GPCR tilt and thermal motion are critical factors that dictate cholesterol binding site accessibility and conformation.
- This approach offers insights into the dynamic nature of cholesterol-protein interactions in membrane environments.
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