National Natural Science Foundation of China (NSFC)
31972916
China
Citation
Journal: Proc Natl Acad Sci U S A / Year: 2024 Title: Entropy drives the ligand recognition in G-protein-coupled receptor subtypes. Authors: Xin Yang / Pei Zhou / Siyuan Shen / Qian Hu / Chenyu Tian / Anjie Xia / Yifei Wang / Zhiqian Yang / Jinshan Nan / Yangli Zhou / Shasha Chen / Xiaowen Tian / Chao Wu / Guifeng Lin / Liting ...Authors: Xin Yang / Pei Zhou / Siyuan Shen / Qian Hu / Chenyu Tian / Anjie Xia / Yifei Wang / Zhiqian Yang / Jinshan Nan / Yangli Zhou / Shasha Chen / Xiaowen Tian / Chao Wu / Guifeng Lin / Liting Zhang / Kexin Wang / Tao Zheng / Jun Zou / Wei Yan / Zhenhua Shao / Shengyong Yang / Abstract: Achieving ligand subtype selectivity within highly homologous subtypes of G-protein-coupled receptor (GPCR) is critical yet challenging for GPCR drug discovery, primarily due to the unclear mechanism ...Achieving ligand subtype selectivity within highly homologous subtypes of G-protein-coupled receptor (GPCR) is critical yet challenging for GPCR drug discovery, primarily due to the unclear mechanism underlying ligand subtype selectivity, which hampers the rational design of subtype-selective ligands. Herein, we disclose an unusual molecular mechanism of entropy-driven ligand recognition in cannabinoid (CB) receptor subtypes, revealed through atomic-level molecular dynamics simulations, cryoelectron microscopy structure, and mutagenesis experiments. This mechanism is attributed to the distinct conformational dynamics of the receptor's orthosteric pocket, leading to variations in ligand binding entropy and consequently, differential binding affinities, which culminate in specific ligand recognition. We experimentally validated this mechanism and leveraged it to design ligands with enhanced or ablated subtype selectivity. One such ligand demonstrated favorable pharmacokinetic properties and significant efficacy in rodent inflammatory analgesic models. More importantly, it is precisely due to the high subtype selectivity obtained based on this mechanism that this ligand does not show addictive properties in animal models. Our findings elucidate the unconventional role of entropy in CB receptor subtype selectivity and suggest a strategy for rational design of ligands to achieve entropy-driven subtype selectivity for many pharmaceutically important GPCRs.
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