Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 116, Issue 51, Pages 26001-26007Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1914446116
Keywords
muscarinic receptor; G protein-coupled receptor; drug design; kinetics; crystal structure
Categories
Funding
- Wellcome Trust Collaborative Award [201529/Z/16/Z]
- National Health and Medical Research Council of Australia (NHMRC) [APP1138448, APP1055134, APP1150083]
- Wellcome Trust [201529/Z/16/Z] Funding Source: Wellcome Trust
- MRC [MR/P019366/1] Funding Source: UKRI
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The human M-5 muscarinic acetylcholine receptor (mAChR) has recently emerged as an exciting therapeutic target for treating a range of disorders, including drug addiction. However, a lack of structural information for this receptor subtype has limited further drug development and validation. Here we report a high-resolution crystal structure of the human M-5 mAChR bound to the clinically used inverse agonist, tiotropium. This structure allowed for a comparison across all 5 mAChR family members that revealed important differences in both orthosteric and allosteric sites that could inform the rational design of selective ligands. These structural studies, together with chimeric swaps between the extracellular regions of the M-2 and M-5 mAChRs, provided structural insight into kinetic selectivity, where ligands show differential residency times between related family members. Collectively, our study provides important insights into the nature of orthosteric and allosteric ligand interaction across the mAChR family that could be exploited for the design of selective drugs.
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