Application of Mixed-Solvent Molecular Dynamics Simulations for Prediction of Allosteric Sites on G Protein–Coupled Receptors

The development of small molecule allosteric modulators acting at G protein–coupled receptors (GPCRs) is becoming increasingly attractive. Such compounds have advantages over traditional drugs acting at orthosteric sites on these receptors, in particular target specificity. However, the number and l...

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Veröffentlicht in:Molecular pharmacology 2023-05, Vol.103 (5), p.274-285
Hauptverfasser: Chan, Wallace K.B., Carlson, Heather A., Traynor, John R.
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Carlson, Heather A.
Traynor, John R.
description The development of small molecule allosteric modulators acting at G protein–coupled receptors (GPCRs) is becoming increasingly attractive. Such compounds have advantages over traditional drugs acting at orthosteric sites on these receptors, in particular target specificity. However, the number and locations of druggable allosteric sites within most clinically relevant GPCRs are unknown. In the present study, we describe the development and application of a mixed-solvent molecular dynamics (MixMD)-based method for the identification of allosteric sites on GPCRs. The method employs small organic probes with druglike qualities to identify druggable hotspots in multiple replicate short-timescale simulations. As proof of principle, we first applied the method retrospectively to a test set of five GPCRs (cannabinoid receptor type 1, C-C chemokine receptor type 2, M2 muscarinic receptor, P2Y purinoceptor 1, and protease-activated receptor 2) with known allosteric sites in diverse locations. This resulted in the identification of the known allosteric sites on these receptors. We then applied the method to the μ-opioid receptor. Several allosteric modulators for this receptor are known, although the binding sites for these modulators are not known. The MixMD-based method revealed several potential allosteric sites on the mu-opioid receptor. Implementation of the MixMD-based method should aid future efforts in the structure-based drug design of drugs targeting allosteric sites on GPCRs. Allosteric modulation of G protein–coupled receptors (GPCRs) has the potential to provide more selective drugs. However, there are limited structures of GPCRs bound to allosteric modulators, and obtaining such structures is problematic. Current computational methods utilize static structures and therefore may not identify hidden or cryptic sites. Here we describe the use of small organic probes and molecular dynamics to identify druggable allosteric hotspots on GPCRs. The results reinforce the importance of protein dynamics in allosteric site identification. ▪
doi_str_mv 10.1124/molpharm.122.000612
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subjects Allosteric Regulation
Allosteric Site
Binding Sites
Ligands
Molecular Dynamics Simulation
Receptor, Muscarinic M2
Receptors, G-Protein-Coupled - metabolism
Receptors, Opioid
Retrospective Studies
Solvents - chemistry
title Application of Mixed-Solvent Molecular Dynamics Simulations for Prediction of Allosteric Sites on G Protein–Coupled Receptors
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