8FSB image
Entry Detail
PDB ID:
8FSB
EMDB ID:
Title:
Full-length mouse 5-HT3A receptor in complex with serotonin, open-like
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2023-01-09
Release Date:
2023-12-27
Method Details:
Experimental Method:
Resolution:
2.75 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:5-hydroxytryptamine receptor 3A
Chain IDs:A, B, C, D, E
Chain Length:553
Number of Molecules:5
Biological Source:Mus musculus
Primary Citation
Structural basis for partial agonism in 5-HT 3A receptors.
Nat.Struct.Mol.Biol. 31 598 609 (2024)
PMID: 38177669 DOI: 10.1038/s41594-023-01140-2

Abstact

Hyperactivity of serotonin 3 receptors (5-HT3R) underlies pathologies associated with irritable bowel syndrome and chemotherapy-induced nausea and vomiting. Setrons, a class of high-affinity competitive antagonists, are used in the treatment of these conditions. Although generally effective for chemotherapy-induced nausea and vomiting, the use of setrons for treating irritable bowel syndrome has been impaired by adverse side effects. Partial agonists are now being considered as an alternative strategy, with potentially less severe side effects than full antagonists. However, a structural understanding of how these ligands work is lacking. Here, we present high-resolution cryogenic electron microscopy structures of the mouse 5-HT3AR in complex with partial agonists (SMP-100 and ALB-148471) captured in pre-activated and open-like conformational states. Molecular dynamics simulations were used to assess the stability of drug-binding poses and interactions with the receptor over time. Together, these studies reveal mechanisms for the functional differences between orthosteric partial agonists, full agonists and antagonists of the 5-HT3AR.

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