Molecular mechanism of muscarinic acetylcholine receptor M3 interaction with Gqopen access
- Authors
- Ham, Donghee; Inoue, Asuka; Xu, Jun; Du, Yang; Chung, Ka Young
- Issue Date
- 23-Mar-2024
- Publisher
- NATURE PORTFOLIO
- Citation
- COMMUNICATIONS BIOLOGY, v.7, no.1
- Indexed
- SCIE
SCOPUS
- Journal Title
- COMMUNICATIONS BIOLOGY
- Volume
- 7
- Number
- 1
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/110359
- DOI
- 10.1038/s42003-024-06056-1
- ISSN
- 2399-3642
2399-3642
- Abstract
- Muscarinic acetylcholine receptor M3 (M3) and its downstream effector Gq/11 are critical drug development targets due to their involvement in physiopathological processes. Although the structure of the M3-miniGq complex was recently published, the lack of information on the intracellular loop 3 (ICL3) of M3 and extensive modification of G alpha q impedes the elucidation of the molecular mechanism of M3-Gq coupling under more physiological condition. Here, we describe the molecular mechanism underlying the dynamic interactions between full-length wild-type M3 and Gq using hydrogen-deuterium exchange mass spectrometry and NanoLuc Binary Technology-based cell systems. We propose a detailed analysis of M3-Gq coupling through examination of previously well-defined binding interfaces and neglected regions. Our findings suggest potential binding interfaces between M3 and Gq in pre-assembled and functionally active complexes. Furthermore, M3 ICL3 negatively affected M3-Gq coupling, and the G alpha q AHD underwent unique conformational changes during M3-Gq coupling. Analysis of M3-Gq coupling utilized fulllength proteins and techniques like HDX-MS & NanoBiT assay, revealing potential binding interfaces in the preassembled and agonistactive complexes and critical regions for the complex formation and Gq activation.
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Collections - Pharmacy > Department of Pharmacy > 1. Journal Articles
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