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Modeling and Mutational Analysis of the Binding Mode for the Multimodal Antidepressant Drug Vortioxetine to the Human 5-HT3A Receptor.

Abstract：

:5-Hydroxytryptamine3 (5-HT3) receptors are ligand-gated ion channels that mediate neurotransmission by serotonin in the central nervous system. Pharmacological inhibition of 5-HT3 receptor activity has therapeutic potential in several psychiatric diseases, including depression and anxiety. The recently approved multimodal antidepressant vortioxetine has potent inhibitory activity at 5-HT3 receptors. Vortioxetine has an inhibitory mechanism that differs from classic 5-HT3 receptor competitive antagonists despite being believed to bind in the same binding site. Specifically, vortioxetine shows partial agonist activity followed by persistent and insurmountable inhibition. We have investigated the binding mode of vortioxetine at the human 5-HT3A receptor through computational and in vitro experiments to provide insight into the molecular mechanisms behind the unique pharmacological profile of the drug. We find that vortioxetine binds in a manner different from currently known 5-HT3A orthosteric ligands. Specifically, while the binding pattern of vortioxetine mimics some aspects of both the setron class of competitive antagonists and 5-hydroxytryptamine (5-HT) with regards to interactions with residues of the aromatic box motif in the orthosteric binding site, vortioxetine also forms interactions with residues not previously described to be important for the binding of either setrons or 5-HT such as Val202 on Loop F. Our results expand the framework for understanding how orthosteric ligands drive 5-HT3 receptor function, which is of importance for the potential future development of novel classes of 5-HT3 receptor antagonists.

journal_name

Mol Pharmacol

journal_title

Molecular pharmacology

authors

Ladefoged LK,Munro L,Pedersen AJ,Lummis SCR,Bang-Andersen B,Balle T,Schiøtt B,Kristensen AS

doi

10.1124/mol.118.113530

subject

Has Abstract

pub_date

2018-12-01 00:00:00

pages

1421-1434

issue

6

eissn

0026-895X

issn

1521-0111

pii

mol.118.113530

journal_volume

94

pub_type

杂志文章

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