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Updated: Mar 8, 2026

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Published on: August 16, 2018
Positional isomers of bispyridine benzene derivatives induce efficacy changes on mGlu5 negative allosteric modulation
Xavier Gómez-Santacana1, James A R Dalton2, Xavier Rovira3
1MCS, Laboratory of Medicinal Chemistry & Synthesis, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain; Laboratory of Molecular Neuropharmacology and Bioinformatics, Institut de Neurociències and Unitat de Bioestadística, Universitat Autònoma de Barcelona (UAB), 08193 Bellaterra, Spain; Nanoprobes and Nanoswitches, Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac, 08028, Barcelona, Spain.
Abstract:
Modulation of metabotropic glutamate receptor 5 (mGlu5) with partial allosteric antagonists has received increased interest due to their favourable in vivo activity profiles compared to the unfavourable side-effects of full inverse agonists. Here we report on a series of bispyridine benzene derivatives with a functional molecular switch affecting antagonistic efficacy, shifting from inverse agonism to partial antagonism with only a single change in the substitution pattern of the benzene ring. These efficacy changes are explained through computational docking, revealing two different receptor conformations of different energetic stability and different positional isomer binding preferences.
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