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Structure-based discovery of β2-adrenergic receptor ligands

By Peter Kolb, Daniel M. Rosenbaum, John J. Irwin, Juan José Fung, Brian K. Kobilka and Brian K. Shoichet


Aminergic G protein-coupled receptors (GPCRs) have been a major focus of pharmaceutical research for many years. Due partly to the lack of reliable receptor structures, drug discovery efforts have been largely ligand-based. The recently determined X-ray structure of the β2-adrenergic receptor offers an opportunity to investigate the advantages and limitations inherent in a structure-based approach to ligand discovery against this and related GPCR targets. Approximately 1 million commercially available, “lead-like” molecules were docked against the β2-adrenergic receptor structure. On testing of 25 high-ranking molecules, 6 were active with binding affinities <4 μM, with the best molecule binding with a Ki of 9 nM (95% confidence interval 7–10 nM). Five of these molecules were inverse agonists. The high hit rate, the high affinity of the most potent molecule, the discovery of unprecedented chemotypes among the new inhibitors, and the apparent bias toward inverse agonists among the docking hits, have implications for structure-based approaches against GPCRs that recognize small organic molecules

Topics: Biological Sciences
Publisher: National Academy of Sciences
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Provided by: PubMed Central
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