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- PDB-9r42: Quinpirole-bound Dopamine D3 Receptor - Gi Protein Complex -

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Basic information

Entry
Database: PDB / ID: 9r42
TitleQuinpirole-bound Dopamine D3 Receptor - Gi Protein Complex
Components
  • (Guanine nucleotide-binding protein ...) x 3
  • Soluble cytochrome b562,D(3) dopamine receptor
KeywordsMEMBRANE PROTEIN / Dopamine D3 Receptor / GPCR
Function / homology
Function and homology information


musculoskeletal movement, spinal reflex action / acid secretion / dopamine neurotransmitter receptor activity, coupled via Gi/Go / response to histamine / regulation of potassium ion transport / adenylate cyclase-inhibiting dopamine receptor signaling pathway / Dopamine receptors / regulation of dopamine uptake involved in synaptic transmission / positive regulation of dopamine receptor signaling pathway / phospholipase C-activating dopamine receptor signaling pathway ...musculoskeletal movement, spinal reflex action / acid secretion / dopamine neurotransmitter receptor activity, coupled via Gi/Go / response to histamine / regulation of potassium ion transport / adenylate cyclase-inhibiting dopamine receptor signaling pathway / Dopamine receptors / regulation of dopamine uptake involved in synaptic transmission / positive regulation of dopamine receptor signaling pathway / phospholipase C-activating dopamine receptor signaling pathway / negative regulation of oligodendrocyte differentiation / G protein-coupled receptor internalization / negative regulation of synaptic transmission, glutamatergic / arachidonate secretion / response to morphine / positive regulation of cytokinesis / negative regulation of cytosolic calcium ion concentration / dopamine metabolic process / regulation of dopamine secretion / social behavior / negative regulation of protein secretion / prepulse inhibition / negative regulation of blood pressure / regulation of eating behavior / behavioral response to cocaine / adenylate cyclase inhibitor activity / positive regulation of mitotic nuclear division / T cell migration / positive regulation of protein localization to cell cortex / positive regulation of relaxation of smooth muscle / Adenylate cyclase inhibitory pathway / D2 dopamine receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / learning / G protein-coupled serotonin receptor binding / negative regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction / cellular response to forskolin / locomotory behavior / regulation of mitotic spindle organization / mast cell degranulation / chemokine-mediated signaling pathway / response to cocaine / circadian regulation of gene expression / electron transport chain / neuropeptide signaling pathway / Regulation of insulin secretion / response to prostaglandin E / visual learning / positive regulation of cholesterol biosynthetic process / intracellular calcium ion homeostasis / G protein-coupled receptor binding / response to peptide hormone / G protein-coupled receptor activity / G-protein beta/gamma-subunit complex binding / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G protein-coupled acetylcholine receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Glucagon signaling in metabolic regulation / G beta:gamma signalling through CDC42 / Prostacyclin signalling through prostacyclin receptor / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / GDP binding / G beta:gamma signalling through BTK / photoreceptor disc membrane / ADP signalling through P2Y purinoceptor 12 / Glucagon-type ligand receptors / Sensory perception of sweet, bitter, and umami (glutamate) taste / 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 / G beta:gamma signalling through PI3Kgamma / ADORA2B mediated anti-inflammatory cytokines production / adenylate cyclase-activating dopamine receptor signaling pathway / cellular response to prostaglandin E stimulus / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / heterotrimeric G-protein complex / Inactivation, recovery and regulation of the phototransduction cascade / G alpha (12/13) signalling events / G-protein beta-subunit binding / extracellular vesicle / Thrombin signalling through proteinase activated receptors (PARs) / signaling receptor complex adaptor activity / adenylate cyclase-activating G protein-coupled receptor signaling pathway / GTPase binding / G protein activity / midbody / Ca2+ pathway / cell cortex
Similarity search - Function
Dopamine D3 receptor / Dopamine receptor family / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / G-protein alpha subunit, group I / Serpentine type 7TM GPCR chemoreceptor Srsx / G protein alpha subunit, helical insertion / G protein alpha subunit / Guanine nucleotide binding protein (G-protein), alpha subunit ...Dopamine D3 receptor / Dopamine receptor family / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / G-protein alpha subunit, group I / Serpentine type 7TM GPCR chemoreceptor Srsx / G protein alpha subunit, helical insertion / G protein alpha subunit / Guanine nucleotide binding protein (G-protein), alpha subunit / G-protein alpha subunit / G-alpha domain profile. / 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. / 7 transmembrane receptor (rhodopsin family) / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 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
: / Soluble cytochrome b562 / D(3) dopamine receptor / 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 / Guanine nucleotide-binding protein G(i) subunit alpha-1
Similarity search - Component
Biological speciesHomo sapiens (human)
Escherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.24 Å
AuthorsSchneider, J. / Gmeiner, P. / Hove, T. / Boettcher, B.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: To Be Published
Title: Quinpirole-bound Dopamine D3 Receptor - Gi Protein Complex
Authors: Schneider, J. / Gmeiner, P. / Hove, T. / Boettcher, B.
History
DepositionMay 7, 2025Deposition site: PDBE / Processing site: PDBE
Revision 1.0May 20, 2026Provider: repository / Type: Initial release
Revision 1.0May 20, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0May 20, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0May 20, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0May 20, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0May 20, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Guanine nucleotide-binding protein G(i) subunit alpha-1
B: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
C: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
R: Soluble cytochrome b562,D(3) dopamine receptor
hetero molecules


Theoretical massNumber of molelcules
Total (without water)149,9385
Polymers149,7194
Non-polymers2191
Water362
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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

#1: Protein Guanine nucleotide-binding protein G(i) subunit alpha-1


Mass: 40414.047 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNAI1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P63096
#2: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1


Mass: 38810.352 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
#3: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / G gamma-I


Mass: 7861.143 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNG2 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P59768

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Protein , 1 types, 1 molecules R

#4: Protein Soluble cytochrome b562,D(3) dopamine receptor / Cytochrome b-562 / Dopamine D3 receptor


Mass: 62633.105 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli), (gene. exp.) Homo sapiens (human)
Gene: cybC, DRD3 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P0ABE7, UniProt: P35462

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Non-polymers , 2 types, 3 molecules

#5: Chemical ChemComp-A1JDS / (4aR,8aR)-5-propyl-1,4,4a,6,7,8,8a,9-octahydropyrazolo[3,4-g]quinoline


Mass: 219.326 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C13H21N3 / Feature type: SUBJECT OF INVESTIGATION
#6: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Formula: H2O

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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

ComponentName: Quinpirole-bound dopamine D3 receptor in complex with Gi protein
Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Details: The original data (e.g., STAR files or micrograph metadata) are not available for this dataset. Therefore, the reported minimum and maximum defocus values (800 nm and 2500 nm, respectively) ...Details: The original data (e.g., STAR files or micrograph metadata) are not available for this dataset. Therefore, the reported minimum and maximum defocus values (800 nm and 2500 nm, respectively) are based on standard cryo-EM data collection practices for similar resolution and instrumentation at the time of acquisition.
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 130000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 70 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
4cryoSPARCCTF correction
10cryoSPARCinitial Euler assignment
12RELION5classification
13RELION53D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.24 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 191116 / Symmetry type: POINT

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