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Bioorg Med Chem. 2008 Feb 1;16(3):1376-92. Epub 2007 Oct 22.

Synthesis and evaluation of xanomeline analogs--probing the wash-resistant phenomenon at the M1 muscarinic acetylcholine receptor.

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  • 1Department of Medicinal Chemistry, Center for Drug Design, University of Minnesota, Minneapolis, MN 55455, USA.

Abstract

A series of xanomeline analogs were synthesized and evaluated for binding at the M(1) muscarinic acetylcholine receptor (M(1) receptor). Specifically, compounds that substitute the O-hexyl chain of xanomeline with polar, ionizable, or conformationally restricted moieties were assessed for their ability to bind to the M(1) receptor in a wash-resistant manner (persistent binding). From our screen, several novel ligands that persistently bind to the M(1) receptor with greater affinity than xanomeline were discovered. Results indicate that persistent binding may arise not only from hydrophobic interactions but also from ionic interactions with a secondary M(1) receptor binding site. Herein, a qualitative model that accounts for both binding scenarios is proposed and applied to understand the structural basis to wash-resistant binding and long-acting effects of xanomeline-based compounds.

PMID:
17977730
DOI:
10.1016/j.bmc.2007.10.058
[PubMed - indexed for MEDLINE]

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