Download MendeleySnapshot of the cannabinoid receptor 1-arrestin complex unravels the biased signaling mechanism.
Liao, Y.Y., Zhang, H., Shen, Q., Cai, C., Ding, Y., Shen, D.D., Guo, J., Qin, J., Dong, Y., Zhang, Y., Li, X.M.(2023) Cell 186: 5784-5797.e17
- PubMed: 38101408
- DOI: https://doi.org/10.1016/j.cell.2023.11.017
- Primary Citation of Related Structures:
8WU1 - PubMed Abstract:
Cannabis activates the cannabinoid receptor 1 (CB1), which elicits analgesic and emotion regulation benefits, along with adverse effects, via G i and β-arrestin signaling pathways. However, the lack of understanding of the mechanism of β-arrestin-1 (βarr1) coupling and signaling bias has hindered drug development targeting CB1. Here, we present the high-resolution cryo-electron microscopy structure of CB1-βarr1 complex bound to the synthetic cannabinoid MDMB-Fubinaca (FUB), revealing notable differences in the transducer pocket and ligand-binding site compared with the G i protein complex. βarr1 occupies a wider transducer pocket promoting substantial outward movement of the TM6 and distinctive twin toggle switch rearrangements, whereas FUB adopts a different pose, inserting more deeply than the G i -coupled state, suggesting the allosteric correlation between the orthosteric binding pocket and the partner protein site. Taken together, our findings unravel the molecular mechanism of signaling bias toward CB1, facilitating the development of CB1 agonists.
Organizational Affiliation:
Department of Neurobiology and Department of Neurology of Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China; Nanhu Brain-computer Interface Institute, Hangzhou 311100, China; NHC and CAMS Key Laboratory of Medical Neurobiology, MOE Frontier Center of Brain Science and Brain-machine Integration, School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou 310058, China.
