8ugy

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Serotonin 1E receptor (5-HT1eR)-Gi1 Complex bound with Mianserin

Structural highlights

8ugy is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Electron Microscopy, Resolution 3.31Å
Ligands:CLR, WRU
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

GNAI1_HUMAN Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. The G(i) proteins are involved in hormonal regulation of adenylate cyclase: they inhibit the cyclase in response to beta-adrenergic stimuli. The inactive GDP-bound form prevents the association of RGS14 with centrosomes and is required for the translocation of RGS14 from the cytoplasm to the plasma membrane. May play a role in cell division.[1] [2]

Publication Abstract from PubMed

Serotonin [5-hydroxytryptamine (5-HT)] acts via 13 different receptors in humans. Of these receptor subtypes, all but 5-HT(1e)R have confirmed roles in native tissue and are validated drug targets. Despite 5-HT(1e)R's therapeutic potential and plausible druggability, the mechanisms of its activation remain elusive. To illuminate 5-HT(1e)R's pharmacology in relation to the highly homologous 5-HT(1F)R, we screened a library of aminergic receptor ligands at both receptors and observe 5-HT(1e)R/5-HT(1F)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(1e)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(1e)R and 5-HT(1F)R contribute to the agonist activity of these antidepressants.

Structural insights into the unexpected agonism of tetracyclic antidepressants at serotonin receptors 5-HT(1e)R and 5-HT(1F)R.,Zilberg G, Parpounas AK, Warren AL, Fiorillo B, Provasi D, Filizola M, Wacker D Sci Adv. 2024 Apr 19;10(16):eadk4855. doi: 10.1126/sciadv.adk4855. Epub 2024 Apr , 17. PMID:38630816[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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References

  1. ↑ Cho H, Kehrl JH. Localization of Gi alpha proteins in the centrosomes and at the midbody: implication for their role in cell division. J Cell Biol. 2007 Jul 16;178(2):245-55. PMID:17635935 doi:10.1083/jcb.200604114
  2. ↑ Johnston CA, Siderovski DP. Structural basis for nucleotide exchange on G alpha i subunits and receptor coupling specificity. Proc Natl Acad Sci U S A. 2007 Feb 6;104(6):2001-6. Epub 2007 Jan 30. PMID:17264214
  3. ↑ Zilberg G, Parpounas AK, Warren AL, Fiorillo B, Provasi D, Filizola M, Wacker D. Structural insights into the unexpected agonism of tetracyclic antidepressants at serotonin receptors 5-HT(1e)R and 5-HT(1F)R. Sci Adv. 2024 Apr 19;10(16):eadk4855. PMID:38630816 doi:10.1126/sciadv.adk4855

Contents


PDB ID 8ugy

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