7E2X image
Deposition Date 2021-02-07
Release Date 2021-04-14
Last Version Date 2024-10-23
Entry Detail
PDB ID:
7E2X
Title:
Apo serotonin 1A (5-HT1A) receptor-Gi protein complex
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Escherichia coli (Taxon ID: 562)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.00 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Guanine nucleotide-binding protein G(i) subunit alpha-1
Gene (Uniprot):GNAI1
Mutations:S47N, G203A, E245A, A326S
Chain IDs:A
Chain Length:354
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Gene (Uniprot):GNB1
Chain IDs:B
Chain Length:345
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
Gene (Uniprot):GNG2
Chain IDs:C (auth: G)
Chain Length:71
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Soluble cytochrome b562,5-hydroxytryptamine receptor 1A
Gene (Uniprot):HTR1A, cybC
Mutations:M7W,H102I,R106L,L125W
Chain IDs:D (auth: R)
Chain Length:543
Number of Molecules:1
Biological Source:Escherichia coli, Homo sapiens
Primary Citation
Structural insights into the lipid and ligand regulation of serotonin receptors.
Nature 592 469 473 (2021)
PMID: 33762731 DOI: 10.1038/s41586-021-03376-8

Abstact

Serotonin, or 5-hydroxytryptamine (5-HT), is an important neurotransmitter1,2 that activates the largest subtype family of G-protein-coupled receptors3. Drugs that target 5-HT1A, 5-HT1D, 5-HT1E and other 5-HT receptors are used to treat numerous disorders4. 5-HT receptors have high levels of basal activity and are subject to regulation by lipids, but the structural basis for the lipid regulation and basal activation of these receptors and the pan-agonism of 5-HT remains unclear. Here we report five structures of 5-HT receptor-G-protein complexes: 5-HT1A in the apo state, bound to 5-HT or bound to the antipsychotic drug aripiprazole; 5-HT1D bound to 5-HT; and 5-HT1E in complex with a 5-HT1E- and 5-HT1F-selective agonist, BRL-54443. Notably, the phospholipid phosphatidylinositol 4-phosphate is present at the G-protein-5-HT1A interface, and is able to increase 5-HT1A-mediated G-protein activity. The receptor transmembrane domain is surrounded by cholesterol molecules-particularly in the case of 5-HT1A, in which cholesterol molecules are directly involved in shaping the ligand-binding pocket that determines the specificity for aripiprazol. Within the ligand-binding pocket of apo-5-HT1A are structured water molecules that mimic 5-HT to activate the receptor. Together, our results address a long-standing question of how lipids and water molecules regulate G-protein-coupled receptors, reveal how 5-HT acts as a pan-agonist, and identify the determinants of drug recognition in 5-HT receptors.

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Primary Citation of related structures