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The role of orthosteric building blocks of bitopic ligands for muscarinic M1 receptors

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Item Type:Article
Title:The role of orthosteric building blocks of bitopic ligands for muscarinic M1 receptors
Creators Name:Volpato, D., Kauk, M., Messerer, R., Bermudez, M., Wolber, G., Bock, A., Hoffmann, C. and Holzgrabe, U.
Abstract:The muscarinic M1 acetylcholine receptor is an important drug target for the treatment of various neurological disorders. Designing M1 receptor-selective drugs has proven challenging, mainly due to the high conservation of the acetylcholine binding site among muscarinic receptor subtypes. Therefore, less conserved and topographically distinct allosteric binding sites have been explored to increase M1 receptor selectivity. In this line, bitopic ligands, which target orthosteric and allosteric binding sites simultaneously, may provide a promising strategy. Here, we explore the allosteric, M1-selective BQCAd scaffold derived from BQCA as a starting point for the design, synthesis, and pharmacological evaluation of a series of novel bitopic ligands in which the orthosteric moieties and linker lengths are systematically varied. Since β-arrestin recruitment seems to be favorable to therapeutic implication, all the compounds were investigated by G protein and β-arrestin assays. Some bitopic ligands are partial to full agonists for G protein activation, some activate β-arrestin recruitment, and the degree of β-arrestin recruitment varies according to the respective modification. The allosteric BQCAd scaffold controls the positioning of the orthosteric ammonium group of all ligands, suggesting that this interaction is essential for stimulating G protein activation. However, β-arrestin recruitment is not affected. The novel set of bitopic ligands may constitute a toolbox to study the requirements of β-arrestin recruitment during ligand design for therapeutic usage.
Source:ACS Omega
ISSN:2470-1343
Publisher:American Chemical Society
Volume:5
Number:49
Page Range:31706-31715
Date:15 December 2020
Official Publication:https://doi.org/10.1021/acsomega.0c04220
PubMed:View item in PubMed

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