Rational Design of Partial Agonists for the Muscarinic M1 Acetylcholine Receptor
摘要:
Aiming to design partial agonists for a G-protein-coupled receptor based on dynamic ligand binding, we synthesized three different series of bipharmacophoric ligands composed of the orthosteric building blocks iperoxo and 1 linked to allosteric modulators (BQCA-derived compounds, BQCAd; TBPB-derived compound, TBPBd). Their interactions were studied with the human muscarinic acetylcholine M-1-receptor (hM(1)) with respect to receptor binding and G(q)-protein signaling. Results demonstrate that iperoxo/BQCAd (2, 3) and 1/BQCAd hybrids (4) act as M1 partial agonists, whereas 1/TBPBd hybrids (5) did not activate M-1-receptors. Among the iperoxo/BQCAd-hybrids, spacer length in conjunction with the pattern of substitution tuned efficacy. Most interestingly, a model of dynamic ligand binding revealed that the spacer length of 2a and 3a controlled the probability of switch between the inactive purely allosteric and the active bitopic orthosteric/allosteric binding pose. In summary, dynamic ligand binding can be exploited in M-1 receptors to design partial agonists with graded efficacy.
Parallel synthesis of N-biaryl quinolone carboxylic acids as selective M1 positive allosteric modulators
作者:Feng V. Yang、William D. Shipe、Jaime L. Bunda、M. Brad Nolt、David D. Wisnoski、Zhijian Zhao、James C. Barrow、William J. Ray、Lei Ma、Marion Wittmann、Matthew A. Seager、Kenneth A. Koeplinger、George D. Hartman、Craig W. Lindsley
DOI:10.1016/j.bmcl.2009.11.100
日期:2010.1
An iterative analog library synthesis approach was employed in the exploration of a quinolone carboxylic acid series of selective M-1 positive allosteric modulators, and strategies for improving potency and plasma free fraction were identified. (C) 2009 Elsevier Ltd. All rights reserved.