Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 115, Issue 47, Pages 12046-12050Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1813988115
Keywords
muscarinic receptor; G protein-coupled receptor; drug design; subtype selectivity; crystal structure
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Funding
- US NIH National Institute of General Medical Sciences (NIGMS) [GM106990, R35GM122481]
- German Research Foundation [Gm 13/10, GRK 1910]
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Drugs that treat chronic obstructive pulmonary disease by antagonizing the M3 muscarinic acetylcholine receptor (M3R) have had a significant effect on health, but can suffer from their lack of selectivity against the M2R subtype, which modulates heart rate. Beginning with the crystal structures of M2R and M3R, we exploited a single amino acid difference in their orthosteric binding pockets using molecular docking and structure-based design. The resulting M3R antagonists had up to 100-fold selectivity over M2R in affinity and over 1,000-fold selectivity in vivo. The crystal structure of the M3R-selective antagonist in complex with M3R corresponded closely to the docking-predicted geometry, providing a template for further optimization.
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