Abstract
To probe the selective mechanism of agonists binding to three opioid receptor subtypes, ligand-based and receptor-based methods were implemented together and subtype characteristics of opioid agonists were clearly described. Three pharmacophore models of opioid agonists were generated by the Catalyst/HypoGen program. The best pharmacophore models for μ, δ and κ agonists contained four, five and five features, respectively. Meanwhile, the three-dimensional structures of three receptor subtypes were modeled on the basis of the crystal structure of β2-adrenergic receptor, and molecular docking was conducted further. According to these pharmacophore models and docking results, the similarities and differences among agonists of three subtypes were identified. μ or δ agonists, for example, could form one hydrogen bond separately with Tyr129 and Tyr150 at TMIII, whereas κ ones formed a π-π interaction in that place. These findings may be crucial for the development of novel selective analgesic drugs.
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This work was supported by National Natural Science Foundation of China (Grants 30600785 and 30973642), the Fundamental Research Funds for the Central Universities (Grant 0914035) and Key 863 High-Tech Program (Grant 2006AA020404).
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Cheng, J., Liu, G., Zhang, J. et al. Insights into subtype selectivity of opioid agonists by ligand-based and structure-based methods. J Mol Model 17, 477–493 (2011). https://doi.org/10.1007/s00894-010-0745-1
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DOI: https://doi.org/10.1007/s00894-010-0745-1