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Article Dans Une Revue Cell Reports Année : 2023

Sodium is a negative allosteric regulator of the ghrelin receptor

Le sodium est un régulateur allostérique négatif du récepteur de la ghréline

Résumé

The functional properties of G protein-coupled receptors (GPCRs) are intimately associated with the different components in their cellular environment. Among them, sodium ions have been proposed to play a substantial role as endogenous allosteric modulators of GPCR-mediated signaling. However, this sodium effect and the underlying mechanisms are still unclear for most GPCRs. Here, we identified sodium as a negative allosteric modulator of the ghrelin receptor GHSR (growth hormone secretagogue receptor). Combining 23Na-nuclear magnetic resonance (NMR), molecular dynamics, and mutagenesis, we provide evidence that, in GHSR, sodium binds to the allosteric site conserved in class A GPCRs. We further leveraged spectroscopic and functional assays to show that sodium binding shifts the conformational equilibrium toward the GHSR-inactive ensemble, thereby decreasing basal and agonist-induced receptor-catalyzed G protein activation. All together, these data point to sodium as an allosteric modulator of GHSR, making this ion an integral component of the ghrelin signaling machinery.
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hal-04265315 , version 1 (07-11-2023)

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Guillaume Ferré, Antoniel A.S. Gomes, Maxime Louet, Marjorie Damian, Paulo Bisch, et al.. Sodium is a negative allosteric regulator of the ghrelin receptor. Cell Reports, 2023, 42 (4), pp.112320. ⟨10.1016/j.celrep.2023.112320⟩. ⟨hal-04265315⟩
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