7YS6 image
Entry Detail
PDB ID:
7YS6
EMDB ID:
Title:
Cryo-EM structure of the Serotonin 6 (5-HT6) receptor-DNGs-scFv16 complex
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2022-08-11
Release Date:
2023-03-29
Method Details:
Experimental Method:
Resolution:
3.00 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:5-hydroxytryptamine receptor 6
Chain IDs:A
Chain Length:304
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Isoform Gnas-2 of Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
Chain IDs:E (auth: B)
Chain Length:373
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Chain IDs:B (auth: C)
Chain Length:357
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
Chain IDs:C (auth: D)
Chain Length:71
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:scFv16
Chain IDs:D (auth: E)
Chain Length:266
Number of Molecules:1
Biological Source:Mus musculus
Ligand Molecules
Primary Citation
Structural insights into constitutive activity of 5-HT 6 receptor.
Proc.Natl.Acad.Sci.USA 120 e2209917120 e2209917120 (2023)
PMID: 36989299 DOI: 10.1073/pnas.2209917120

Abstact

While most therapeutic research on G-protein-coupled receptors (GPCRs) focuses on receptor activation by (endogenous) agonists, significant therapeutic potential exists through agonist-independent intrinsic constitutive activity that can occur in various physiological and pathophysiological settings. For example, inhibiting the constitutive activity of 5-HT6R-a receptor that is found almost exclusively in the brain and mediates excitatory neurotransmission-has demonstrated a therapeutic effect on cognitive/memory impairment associated with several neuropsychiatric disorders. However, the structural basis of such constitutive activity remains unclear. Here, we present a cryo-EM structure of serotonin-bound human 5-HT6R-Gs heterotrimer at 3.0-Å resolution. Detailed analyses of the structure complemented by comprehensive interrogation of signaling illuminate key structural determinants essential for constitutive 5-HT6R activity. Additional structure-guided mutagenesis leads to a nanobody mimic Gαs for 5-HT6R that can reduce its constitutive activity. Given the importance of 5-HT6R for a large number of neuropsychiatric disorders, insights derived from these studies will accelerate the design of more effective medications, and shed light on the molecular basis of constitutive activity.

Legend

Protein

Chemical

Disease

Primary Citation of related structures