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Hsiao, Wen-Chi; Hsin, Kun-Yi; Wu, Zhong-Wei; Song, Jen-Shin; Yeh, Yen-Nan; Chen, Yan-Fu; Tsai, Chia-Hua; Chen, Pei-Hsuan; Shia, Kak-Shan; Chang, Chun-Ping; Hung, Ming-Shiu
Bioorganic chemistry, January 2023, 2023-01-00, 20230101, Letnik: 130Journal Article
Display omitted •Biased antagonism can be intricately modulated by minor modifications of the functional moieties.•Binding affinity and functional inhibitory activities can be decoupled.•Slight modifications onthe functional groups affect the interaction modes of test compounds. Cannabinoid receptor 1 (CB1) is a G protein-coupled receptor and a therapeutic target for metabolic disorders. Numerous CB1 antagonists have been developed, but their functional selectivities and bias towards G protein or β-arrestin signaling have not been systemically characterized. In this study, we analyzed the binding affinities and downstream signaling of two series of pyrazole derivatives bearing 1-aminopiperidine (Series I) or 4-aminothiomorpholine 1,1-dioxide (Series II) moieties, as well as the well-known CB1 antagonists rimonabant and taranabant. Analyses of the results for the Series I and II derivatives showed that minor structure modifications to their functional groups and especially the incorporation of 1-aminopiperidine or 4-aminothiomorpholine 1,1-dioxide motifs can profoundly affect their bias toward G protein or β-arrestin signaling, and that their binding affinity and functional activity can be disassociated. Docking and molecular dynamics simulations revealed that the binding modes of Series I and II antagonists differed primarily in that Series I antagonists formed an additional hydrogen bond with the receptor, whereas those in Series II formed a water bridge.
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