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Pré-publication, Document de travail

Allosteric modulators enhance agonist efficacy by increasing the residence time of a GPCR in the active state

Abstract : Much hope in drug development comes from the discovery of positive allosteric modulators (PAM) that display target subtype selectivity, and act by increasing agonist potency and efficacy. How such compounds can allosterically influence agonist action remains unclear. Metabotropic glutamate receptors (mGlu) are G protein-coupled receptors that represent promising targets for brain diseases, and for which PAMs acting in the transmembrane domain have been developed. Here, we explore the effect of a PAM on the structural dynamics of mGlu2 in optimized detergent micelles using single molecule FRET at submillisecond timescales. We show that glutamate only partially stabilizes the extracellular domains in the active state. Full activation is only observed in the presence of a PAM or the G i protein. Our results provide important insights on the role of allosteric modulators in mGlu activation, by stabilizing the active state of a receptor that is otherwise rapidly oscillating between active and inactive states.
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Pré-publication, Document de travail
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https://hal.umontpellier.fr/hal-03191940
Contributeur : Emmanuel Margeat <>
Soumis le : mercredi 7 avril 2021 - 16:01:17
Dernière modification le : jeudi 15 avril 2021 - 17:13:59

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Anne-Marinette Cao, Robert Quast, Fataneh Fatemi, Philippe Rondard, Jean-Philippe Pin, et al.. Allosteric modulators enhance agonist efficacy by increasing the residence time of a GPCR in the active state. 2021. ⟨hal-03191940⟩

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