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- EMDB-63723: dimer-GPR3-Gs complex -

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Basic information

Entry
Database: EMDB / ID: EMD-63723
Titledimer-GPR3-Gs complex
Map data
Sample
  • Complex: dimer GPR3-Gs complex
    • Protein or peptide: Soluble cytochrome b562,G-protein coupled receptor 3
    • Protein or peptide: Isoform Gnas-2 of Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
  • Ligand: N-[(4-chloranyl-2-propan-2-yloxy-phenyl)methyl]-5-phenyl-[1,2,4]triazolo[1,5-a]pyrimidin-7-amine
  • Ligand: 1-DODECANOL
  • Ligand: water
KeywordsGPCR / dimer / G-protein complex / MEMBRANE PROTEIN
Function / homology
Function and homology information


sphingosine-1-phosphate receptor activity / regulation of meiotic nuclear division / regulation of metabolic process / PKA activation in glucagon signalling / developmental growth / hair follicle placode formation / D1 dopamine receptor binding / intracellular transport / vascular endothelial cell response to laminar fluid shear stress / renal water homeostasis ...sphingosine-1-phosphate receptor activity / regulation of meiotic nuclear division / regulation of metabolic process / PKA activation in glucagon signalling / developmental growth / hair follicle placode formation / D1 dopamine receptor binding / intracellular transport / vascular endothelial cell response to laminar fluid shear stress / renal water homeostasis / activation of adenylate cyclase activity / Hedgehog 'off' state / adenylate cyclase-activating adrenergic receptor signaling pathway / cellular response to glucagon stimulus / regulation of insulin secretion / adenylate cyclase activator activity / trans-Golgi network membrane / negative regulation of inflammatory response to antigenic stimulus / electron transport chain / G protein-coupled receptor activity / bone development / G-protein beta/gamma-subunit complex binding / platelet aggregation / cognition / 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 / adenylate cyclase-activating G protein-coupled 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 / sensory perception of smell / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / 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) / positive regulation of cold-induced thermogenesis / retina development in camera-type eye / G protein activity / 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 / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / 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 / heme binding / synapse / GTP binding / protein-containing complex binding / signal transduction / extracellular exosome / metal ion binding / membrane / plasma membrane / cytoplasm / cytosol
Similarity search - Function
G protein-coupled receptor 3 / G protein-coupled receptor 3/6/12 orphan / G-protein alpha subunit, group S / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. ...G protein-coupled receptor 3 / G protein-coupled receptor 3/6/12 orphan / G-protein alpha subunit, group S / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / 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
Soluble cytochrome b562 / G-protein coupled receptor 3 / 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(s) subunit alpha isoforms short
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.83 Å
AuthorsGeng C / Jun X
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Nat Commun / Year: 2025
Title: Mechanism and function of GPR3 regulated by a negative allosteric modulator.
Authors: Geng Chen / Jana Bláhová / Nico Staffen / Harald Hübner / Nadja Nunhöfer / Chen Qiu / Peter Gmeiner / Dorothee Weikert / Yang Du / Jun Xu /
Abstract: Allosteric modulators have gained substantial interest in current GPCR drug discovery. Here, we present a mechanism of allosteric modulation involving the dimerization of GPR3, a promising drug ...Allosteric modulators have gained substantial interest in current GPCR drug discovery. Here, we present a mechanism of allosteric modulation involving the dimerization of GPR3, a promising drug target for metabolic diseases and central nervous system disorders. We show that GPR3 forms constitutive homodimers in live cells and reveal that the inhibitor AF64394 functions as a negative allosteric modulator (NAM) specifically targeting dimeric GPR3. Using cryogenic electron microscopy (cryo-EM), we determine the structures of the AF64394-bound GPR3 dimer and its dimer-Gs signaling complex. These high-resolution structures reveal that AF64394 binds to the transmembrane dimer interface. AF64394 binding prevents the dissociation of the GPR3 dimer upon engagement with Gs and restrains transmembrane helix 5 in an inactive-like intermediate conformation, leading to reduced coupling with Gs. Our studies unveil a mechanism of dimer-specific inhibition of signaling with significant implications for the discovery of drugs targeting GPCRs capable of dimerization.
History
DepositionMar 13, 2025-
Header (metadata) releaseSep 24, 2025-
Map releaseSep 24, 2025-
UpdateOct 1, 2025-
Current statusOct 1, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_63723.png

Downloads & links

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Map

FileDownload / File: emd_63723.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.85 Å/pix.
x 360 pix.
= 306. Å		0.85 Å/pix.
x 360 pix.
= 306. Å		0.85 Å/pix.
x 360 pix.
= 306. Å

Surface

Projections

Slices (1/3)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.85 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.15
Minimum - Maximum-0.5405816 - 0.8185008
Average (Standard dev.)-0.000117671756 (±0.013949886)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 306.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_63723_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_63723_half_map_2.map
Projections & Slices
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Histogram (log scale)

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Sample components

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Entire : dimer GPR3-Gs complex

EntireName: dimer GPR3-Gs complex
Components
  • Complex: dimer GPR3-Gs complex
    • Protein or peptide: Soluble cytochrome b562,G-protein coupled receptor 3
    • Protein or peptide: Isoform Gnas-2 of Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
  • Ligand: N-[(4-chloranyl-2-propan-2-yloxy-phenyl)methyl]-5-phenyl-[1,2,4]triazolo[1,5-a]pyrimidin-7-amine
  • Ligand: 1-DODECANOL
  • Ligand: water

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Supramolecule #1: dimer GPR3-Gs complex

SupramoleculeName: dimer GPR3-Gs complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 200 KDa

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Macromolecule #1: Soluble cytochrome b562,G-protein coupled receptor 3

MacromoleculeName: Soluble cytochrome b562,G-protein coupled receptor 3 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 50.446375 KDa
Recombinant expressionOrganism: Spodoptera aff. frugiperda 1 BOLD-2017 (butterflies/moths)
SequenceString: DYKDDDDKLE VLFQGPGSAD LEDNWETLND NLKVIEKADN AAQVKDALTK MRAAALDAQK ATPPKLEDKS PDSPEMKDFR HGFDILVGQ IDDALKLANE GKVKEAQAAA EQLKTTRNAY IQKYLMMWGA GSPLAWLSAG SGNVNVSSVG PAEGPTGPAA P LPSPKAWD ...String:
DYKDDDDKLE VLFQGPGSAD LEDNWETLND NLKVIEKADN AAQVKDALTK MRAAALDAQK ATPPKLEDKS PDSPEMKDFR HGFDILVGQ IDDALKLANE GKVKEAQAAA EQLKTTRNAY IQKYLMMWGA GSPLAWLSAG SGNVNVSSVG PAEGPTGPAA P LPSPKAWD VVLCISGTLV SCENALVVAI IVGTPAFRAP MFLLVGSLAV ADLLAGLGLV LHFAAVFCIG SAEMSLVLVG VL AMAFTAS IGSLLAITVD RYLSLYNALT YYSETTVTRT YVMLALVWGG ALGLGLLPVL AWNCLDGLTT CGVVYPLSKN HLV VLAIAF FMVFGIMLQL YAQICRIVCR HAQQIALQRH LLPASHYVAT RKGIATLAVV LGAFAACWLP FTVYCLLGDA HSPP LYTYL TLLPATYNSM INPIIYAFRN QDVQKVLWAV CCCCSSSKIP FRSRSPSDVL EHHHHHHHHH H

UniProtKB: Soluble cytochrome b562, G-protein coupled receptor 3

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Macromolecule #2: Isoform Gnas-2 of Guanine nucleotide-binding protein G(s) subunit...

MacromoleculeName: Isoform Gnas-2 of Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
EC number: Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 43.385246 KDa
Recombinant expressionOrganism: Spodoptera aff. frugiperda 1 BOLD-2017 (butterflies/moths)
SequenceString: MGCTLSAEDK AAVERSKMIE KQLQKDKQVY RATHRLLLLG AGESGKSTIV KQMRILHVNG FNGDSEKATK VQDIKNNLKE AIETIVAAM SNLVPPVELA NPENQFRVDY ILSVMNVPDF DFPPEFYEHA KALWEDEGVR ACYERSNEYQ LIDCAQYFLD K IDVIKQAD ...String:
MGCTLSAEDK AAVERSKMIE KQLQKDKQVY RATHRLLLLG AGESGKSTIV KQMRILHVNG FNGDSEKATK VQDIKNNLKE AIETIVAAM SNLVPPVELA NPENQFRVDY ILSVMNVPDF DFPPEFYEHA KALWEDEGVR ACYERSNEYQ LIDCAQYFLD K IDVIKQAD YVPSDQDLLR CRVLTSGIFE TKFQVDKVNF HMFDVGGQRD ERRKWIQCFN DVTAIIFVVA SSSYNMVIRE DN QTNRLQE ALNLFKSIWN NRWLRTISVI LFLNKQDLLA EKVLAGKSKI EDYFPEFARY TTPEDATPEP GEDPRVTRAK YFI RDEFLR ISTASGDGRH YCYPHFTCAV DTENIRRVFN DCRDIIQRMH LRQYELL

UniProtKB: Guanine nucleotide-binding protein G(s) subunit alpha isoforms short

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Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 39.286891 KDa
Recombinant expressionOrganism: Spodoptera aff. frugiperda 1 BOLD-2017 (butterflies/moths)
SequenceString: HHHHHHLEVL FQGPGSSGSE LDQLRQEAEQ LKNQIRDARK ACADATLSQI TNNIDPVGRI QMRTRRTLRG HLAKIYAMHW GTDSRLLVS ASQDGKLIIW DSYTTNKVHA IPLRSSWVMT CAYAPSGNYV ACGGLDNICS IYNLKTREGN VRVSRELAGH T GYLSCCRF ...String:
HHHHHHLEVL FQGPGSSGSE LDQLRQEAEQ LKNQIRDARK ACADATLSQI TNNIDPVGRI QMRTRRTLRG HLAKIYAMHW GTDSRLLVS ASQDGKLIIW DSYTTNKVHA IPLRSSWVMT CAYAPSGNYV ACGGLDNICS IYNLKTREGN VRVSRELAGH T GYLSCCRF LDDNQIVTSS GDTTCALWDI ETGQQTTTFT GHTGDVMSLS LAPDTRLFVS GACDASAKLW DVREGMCRQT FT GHESDIN AICFFPNGNA FATGSDDATC RLFDLRADQE LMTYSHDNII CGITSVSFSK SGRLLLAGYD DFNCNVWDAL KAD RAGVLA GHDNRVSCLG VTDDGMAVAT GSWDSFLKIW N

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #4: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Spodoptera aff. frugiperda 1 BOLD-2017 (butterflies/moths)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

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Macromolecule #5: N-[(4-chloranyl-2-propan-2-yloxy-phenyl)methyl]-5-phenyl-[1,2,4]t...

MacromoleculeName: N-[(4-chloranyl-2-propan-2-yloxy-phenyl)methyl]-5-phenyl-[1,2,4]triazolo[1,5-a]pyrimidin-7-amine
type: ligand / ID: 5 / Number of copies: 2 / Formula: A1EM2
Molecular weightTheoretical: 393.869 Da

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Macromolecule #6: 1-DODECANOL

MacromoleculeName: 1-DODECANOL / type: ligand / ID: 6 / Number of copies: 1 / Formula: 1DO
Molecular weightTheoretical: 186.334 Da
Chemical component information

ChemComp-1DO:
1-DODECANOL

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Macromolecule #7: water

MacromoleculeName: water / type: ligand / ID: 7 / Number of copies: 1 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5 / Details: 20mM NaCl, 100mM Hepes, 0.003% LMNG, 0.001% GDN
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 1.12 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.2 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

8x2k

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.83 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 65538
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
FSC plot (resolution estimation)

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