Structural insights into the unexpected agonism of tetracyclic antidepressants at serotonin receptors 5-HT 1e R and 5-HT 1F R

Structural insights into the unexpected agonism of tetracyclic antidepressants at serotonin receptors 5-HT 1e R and 5-HT 1F R

Serotonin [5-hydroxytryptamine (5-HT)] acts via 13 different receptors in humans. Of these receptor subtypes, all but 5-HT R have confirmed roles in native tissue and are validated drug targets. Despite 5-HT R's therapeutic potential and plausible druggability, the mechanisms of its activation...

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Veröffentlicht in:Science advances 2024-04, Vol.10 (16), p.eadk4855
Hauptverfasser: Zilberg, Gregory, Parpounas, Alexandra K, Warren, Audrey L, Fiorillo, Bianca, Provasi, Davide, Filizola, Marta, Wacker, Daniel
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container_issue 16
container_start_page eadk4855
container_title Science advances
container_volume 10
creator Zilberg, Gregory
Parpounas, Alexandra K
Warren, Audrey L
Fiorillo, Bianca
Provasi, Davide
Filizola, Marta
Wacker, Daniel
description Serotonin [5-hydroxytryptamine (5-HT)] acts via 13 different receptors in humans. Of these receptor subtypes, all but 5-HT R have confirmed roles in native tissue and are validated drug targets. Despite 5-HT R's therapeutic potential and plausible druggability, the mechanisms of its activation remain elusive. To illuminate 5-HT R's pharmacology in relation to the highly homologous 5-HT R, we screened a library of aminergic receptor ligands at both receptors and observe 5-HT R/5-HT R agonism by multicyclic drugs described as pan-antagonists at 5-HT receptors. Potent agonism by tetracyclic antidepressants mianserin, setiptiline, and mirtazapine suggests a mechanism for their clinically observed antimigraine properties. Using cryo-EM and mutagenesis studies, we uncover and characterize unique agonist-like binding poses of mianserin and setiptiline at 5-HT R distinct from similar drug scaffolds in inactive-state 5-HTR structures. Together with computational studies, our data suggest that these binding poses alongside receptor-specific allosteric coupling in 5-HT R and 5-HT R contribute to the agonist activity of these antidepressants.
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Science & Technology - Other Topics
title Structural insights into the unexpected agonism of tetracyclic antidepressants at serotonin receptors 5-HT 1e R and 5-HT 1F R
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