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- PDB-9md1: Buspirone-bound serotonin 1A (5-HT1A) receptor-Gz protein complex -

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Basic information

Entry
Database: PDB / ID: 9md1
TitleBuspirone-bound serotonin 1A (5-HT1A) receptor-Gz protein complex
Components
  • (Guanine nucleotide-binding protein ...) x 3
  • Soluble cytochrome b562,5-hydroxytryptamine receptor 1A
KeywordsSIGNALING PROTEIN / GPCR Signaling Complex / Serotonin Receptor
Function / homology
Function and homology information


regulation of serotonin secretion / Gi/o-coupled serotonin receptor activity / G protein-coupled serotonin receptor signaling pathway / regulation of hormone secretion / regulation of behavior / receptor-receptor interaction / Serotonin receptors / serotonin receptor activity / G protein-coupled serotonin receptor activity / regulation of dopamine metabolic process ...regulation of serotonin secretion / Gi/o-coupled serotonin receptor activity / G protein-coupled serotonin receptor signaling pathway / regulation of hormone secretion / regulation of behavior / receptor-receptor interaction / Serotonin receptors / serotonin receptor activity / G protein-coupled serotonin receptor activity / regulation of dopamine metabolic process / serotonin receptor signaling pathway / neurotransmitter receptor activity / serotonin metabolic process / serotonin binding / gamma-aminobutyric acid signaling pathway / exploration behavior / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / regulation of vasoconstriction / behavioral fear response / adenylate cyclase inhibitor activity / G protein-coupled serotonin receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / negative regulation of insulin secretion / electron transport chain / G protein-coupled receptor binding / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G-protein beta/gamma-subunit complex binding / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / photoreceptor disc membrane / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / cellular response to catecholamine stimulus / ADP signalling through P2Y purinoceptor 1 / ADORA2B mediated anti-inflammatory cytokines production / G beta:gamma signalling through PI3Kgamma / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / nuclear envelope / GPER1 signaling / Inactivation, recovery and regulation of the phototransduction cascade / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / retina development in camera-type eye / cell body / GTPase binding / Ca2+ pathway / fibroblast proliferation / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (q) signalling events / chemical synaptic transmission / Ras protein signal transduction / periplasmic space / electron transfer activity / Extra-nuclear estrogen signaling / cell population proliferation / G protein-coupled receptor signaling pathway / iron ion binding / lysosomal membrane / GTPase activity / positive regulation of cell population proliferation / heme binding / synapse / dendrite / GTP binding / protein-containing complex binding / endoplasmic reticulum / signal transduction / extracellular exosome / metal ion binding / membrane / plasma membrane / cytoplasm
Similarity search - Function
5-Hydroxytryptamine 1A receptor / 5-hydroxytryptamine receptor family / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / G-protein alpha subunit, group I / Serpentine type 7TM GPCR chemoreceptor Srsx / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit ...5-Hydroxytryptamine 1A receptor / 5-hydroxytryptamine receptor family / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / G-protein alpha subunit, group I / Serpentine type 7TM GPCR chemoreceptor Srsx / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. / G protein alpha subunit / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / G protein beta WD-40 repeat protein / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 7 transmembrane receptor (rhodopsin family) / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
CHOLESTEROL / Chem-J40 / : / 5-hydroxytryptamine receptor 1A / Soluble cytochrome b562 / Guanine nucleotide-binding protein G(z) subunit alpha / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Similarity search - Component
Biological speciesHomo sapiens (human)
Escherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.03 Å
AuthorsWarren, A.L. / Zilberg, G. / Wacker, D.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM 133504 United States
Other privateMcKnight Foundation
Other privateIrma T. Hirschl/Monique Weill-Caulier Trust
CitationJournal: Sci Adv / Year: 2025
Title: Structural determinants of G protein subtype selectivity at the serotonin receptor 5-HT1A.
Authors: Audrey L Warren / Gregory Zilberg / Anwar Abbassi / Alejandro Abraham / Shifan Yang / Daniel Wacker /
Abstract: Activation of the serotonin receptor 5-HT1A has been shown to regulate mood and cognition, making 5-HT1A an important target in the treatment of anxiety, depression, and psychosis. Although the ...Activation of the serotonin receptor 5-HT1A has been shown to regulate mood and cognition, making 5-HT1A an important target in the treatment of anxiety, depression, and psychosis. Although the receptor signals through inhibitory G proteins, more work is necessary to understand differences in transducer coupling and its relation to functional activity. To develop a molecular understanding of the differences underlying transducer coupling and activation, we performed structure-activity relationship studies of 5-HT1A with distinct G proteins. Through a combination of in vitro assays, we identified a potent partial agonist that selectively engages a G protein subtype. We further investigated the differences in G protein engagement at 5-HT1A with cryo-electron microscopy, determining structures of 5-HT1A bound to distinct ligands and G protein subtypes. Combined with subsequent structure-guided mutagenesis and signaling assays, our studies uncover both orthosteric and allosteric determinants of agonist-specific stimulation of distinct transducers.
History
DepositionDec 5, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 13, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Guanine nucleotide-binding protein G(z) subunit alpha
B: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
C: Soluble cytochrome b562,5-hydroxytryptamine receptor 1A
G: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
R: Soluble cytochrome b562,5-hydroxytryptamine receptor 1A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)217,22917
Polymers211,6555
Non-polymers5,57412
Water00
1
A: Guanine nucleotide-binding protein G(z) subunit alpha
B: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
G: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
R: Soluble cytochrome b562,5-hydroxytryptamine receptor 1A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)153,06610
Polymers150,2794
Non-polymers2,7876
Water0
TypeNameSymmetry operationNumber
identity operation1_5551
2
C: Soluble cytochrome b562,5-hydroxytryptamine receptor 1A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)64,1637
Polymers61,3761
Non-polymers2,7876
Water0
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Guanine nucleotide-binding protein ... , 3 types, 3 molecules ABG

#1: Protein Guanine nucleotide-binding protein G(z) subunit alpha / G(x) alpha chain / Gz-alpha


Mass: 40978.699 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNAZ / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P19086
#2: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Transducin beta chain 1


Mass: 39418.086 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNB1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P62873
#4: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / G gamma-I


Mass: 8506.765 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 with a GSAGSAGSA linker connecting it to the N-terminus of Guanine nucleotide-binding protein G(z) subunit alpha
Source: (gene. exp.) Homo sapiens (human) / Gene: GNG2 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P59768

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Protein , 1 types, 2 molecules CR

#3: Protein Soluble cytochrome b562,5-hydroxytryptamine receptor 1A / Cytochrome b-562 / 5-HT-1A / 5-HT1A / G-21 / Serotonin receptor 1A


Mass: 61375.930 Da / Num. of mol.: 2 / Fragment: residues 1-25 of the 5-HT receptor deleted / Mutation: L125W
Source method: isolated from a genetically manipulated source
Details: N-terminally truncated 5-HT1A receptor with a flag and his tag followed by a TEV cleavage site and BRIL at the N-terminus.
Source: (gene. exp.) Escherichia coli (E. coli), (gene. exp.) Homo sapiens (human)
Gene: cybC, HTR1A, ADRB2RL1, ADRBRL1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P0ABE7, UniProt: P08908

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Non-polymers , 3 types, 12 molecules

#5: Chemical ChemComp-YLX / Buspirone / Buspirone


Mass: 385.503 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C21H31N5O2 / Feature type: SUBJECT OF INVESTIGATION
#6: Chemical
ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: C27H46O
#7: Chemical ChemComp-J40 / [(2R)-1-[oxidanyl-[(2R,3R,5S,6R)-2,3,5,6-tetrakis(oxidanyl)-4-phosphonooxy-cyclohexyl]oxy-phosphoryl]oxy-3-tetradecanoyloxy-propan-2-yl] (5E,8E)-hexadeca-5,8,11,14-tetraenoate


Mass: 854.895 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C39H68O16P2

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeDetailsEntity IDParent-IDSource
1Serotonin 1A (5-HT1A) receptor-Gz protein complexCOMPLEXSerotonin 1A (5-HT1A) receptor-Gz protein complex with components purified separately and assembled in vitro.#1-#40MULTIPLE SOURCES
2Serotonin 1A (5-HT1A) receptorCOMPLEX#31RECOMBINANT
3Gz proteinCOMPLEX#1-#2, #41RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
22Escherichia coli (E. coli)562
32Homo sapiens (human)9606
43Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-IDPlasmid
22Spodoptera frugiperda (fall armyworm)7108pFB
33Spodoptera frugiperda (fall armyworm)7108
Buffer solutionpH: 7.4
Buffer component
IDConc.NameBuffer-ID
120 mMHEPES1
2100 mMsodium chloride1
30.001 % (w/v)LMNG1
40.0001 % (w/v)CHS1
50.0001 % (w/v)GDN1
SpecimenConc.: 18 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Sample was mono disperse following gel filtration. The sample was immediately concentrated for CryoEM grid preparation.
Specimen supportGrid material: COPPER / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: LEICA EM GP / Cryogen name: ETHANE
Details: Blot force 3 for 3-5 seconds was used and subsequent grids were screened for ice thickness prior to data collection.

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 51.33 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of real images: 5849

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
2Leginonimage acquisition
4cryoSPARCCTF correction
7UCSF Chimeramodel fitting
9PHENIXmodel refinement
10Cootmodel refinement
11REFMACmodel refinement
13cryoSPARCfinal Euler assignment
14cryoSPARCclassification
15cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 4465303
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.03 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 447065 / Symmetry type: POINT

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