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- PDB-9ge2: Structure of GPR55 in complex with G13 and synthetic agonist ML184 -

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Entry
Database: PDB / ID: 9ge2
TitleStructure of GPR55 in complex with G13 and synthetic agonist ML184
Components
  • (Guanine nucleotide-binding protein ...) x 3
  • Green fluorescent protein,G-protein coupled receptor 55,G-protein coupled receptor 55
  • Single-chain variable fragment ScFv16
KeywordsMEMBRANE PROTEIN / G protein-coupled receptor / GPCR / lipid agonist / cholesterol
Function / homology
Function and homology information


D5 dopamine receptor binding / regulation of fibroblast migration / Rho-activating G protein-coupled receptor signaling pathway / cannabinoid receptor activity / negative regulation of adenylate cyclase-activating adrenergic receptor signaling pathway / negative regulation of calcium ion-dependent exocytosis / G protein-coupled adenosine receptor signaling pathway / negative regulation of adenylate cyclase activity / positive regulation of urine volume / positive regulation of neural precursor cell proliferation ...D5 dopamine receptor binding / regulation of fibroblast migration / Rho-activating G protein-coupled receptor signaling pathway / cannabinoid receptor activity / negative regulation of adenylate cyclase-activating adrenergic receptor signaling pathway / negative regulation of calcium ion-dependent exocytosis / G protein-coupled adenosine receptor signaling pathway / negative regulation of adenylate cyclase activity / positive regulation of urine volume / positive regulation of neural precursor cell proliferation / Class A/1 (Rhodopsin-like receptors) / negative regulation of synaptic transmission / regulation of small GTPase mediated signal transduction / NRAGE signals death through JNK / branching involved in blood vessel morphogenesis / gamma-aminobutyric acid signaling pathway / positive regulation of Rho protein signal transduction / negative regulation of osteoclast differentiation / regulation of calcium ion transport / CDC42 GTPase cycle / negative regulation of apoptotic signaling pathway / regulation of postsynapse assembly / bone resorption / neuronal dense core vesicle / Rho protein signal transduction / positive regulation of vascular associated smooth muscle cell proliferation / positive regulation of superoxide anion generation / Adenylate cyclase inhibitory pathway / RAC1 GTPase cycle / response to nutrient / guanyl-nucleotide exchange factor activity / hippocampal mossy fiber to CA3 synapse / Regulation of insulin secretion / brush border membrane / G protein-coupled receptor binding / G protein-coupled receptor activity / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / platelet activation / regulation of blood pressure / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G-protein beta/gamma-subunit complex binding / adenylate cyclase-activating G protein-coupled receptor signaling pathway / 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 / melanosome / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / adenylate cyclase-activating dopamine receptor signaling pathway / GPER1 signaling / G-protein beta-subunit binding / cellular response to prostaglandin E stimulus / Inactivation, recovery and regulation of the phototransduction cascade / heterotrimeric G-protein complex / regulation of cell shape / 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 / G protein activity / cell body / GTPase binding / Ca2+ pathway / fibroblast proliferation / midbody / 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 / in utero embryonic development / Ras protein signal transduction / cell differentiation / Extra-nuclear estrogen signaling / positive regulation of ERK1 and ERK2 cascade / cell population proliferation
Similarity search - Function
G-protein alpha subunit, group 12/13 / G-protein alpha subunit, group I / 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 alpha subunit, group 12/13 / G-protein alpha subunit, group I / 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 / Guanine nucleotide-binding protein G(i) subunit alpha-2 / 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 subunit alpha-13 / G-protein coupled receptor 55
Similarity search - Component
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
Aequorea victoria (jellyfish)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.51 Å
AuthorsClaff, T. / Ebenhoch, R. / Weichert, D.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nat Commun / Year: 2025
Title: Structural basis for lipid-mediated activation of G protein-coupled receptor GPR55.
Authors: Tobias Claff / Rebecca Ebenhoch / Jörg T Kley / Aniket Magarkar / Herbert Nar / Dietmar Weichert /
Abstract: GPR55 is an orphan G protein-coupled receptor (GPCR) and represents a promising drug target for cancer, inflammation, and metabolic diseases. The endogenous activation of lipid GPCRs can be solely ...GPR55 is an orphan G protein-coupled receptor (GPCR) and represents a promising drug target for cancer, inflammation, and metabolic diseases. The endogenous activation of lipid GPCRs can be solely mediated by membrane components and different lipids have been proposed as endogenous activators of GPR55, such as cannabinoids and lysophosphatidylinositols. Here, we determine high-resolution cryo-electron microscopy structures of the activated GPR55 in complex with heterotrimeric G and two structurally diverse ligands: the putative endogenous agonist 1-palmitoyl-2-lysophosphatidylinositol (LPI) and the synthetic agonist ML184. These results reveal insights into ligand recognition at GPR55, G protein coupling and receptor activation. Notably, an orthosteric binding site opening towards the membrane is observed in both structures, enabling direct interaction of the agonists with membrane lipids. The structural observations are supported by mutagenesis and functional experiments employing G protein dissociation assays. These findings will be of importance for the structure-based development of drugs targeting GPR55.
History
DepositionAug 6, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Mar 5, 2025Provider: repository / Type: Initial release
Revision 1.0Mar 5, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Mar 5, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Mar 5, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Jul 9, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jul 9, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name
Revision 1.2Dec 17, 2025Group: Data collection / Database references ...Data collection / Database references / Source and taxonomy / Structure summary
Category: em_admin / entity ...em_admin / entity / entity_name_com / entity_src_gen / struct_ref / struct_ref_seq / struct_ref_seq_dif
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Revision 1.2Dec 17, 2025Data content type: EM metadata
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Group: Database references / Experimental summary ...Database references / Experimental summary / Source and taxonomy / Structure summary
Data content type: EM metadata / EM metadata ...EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata
Category: em_admin / entity ...em_admin / entity / entity_src_gen / struct_ref / struct_ref_seq / struct_ref_seq_dif
Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _entity.pdbx_description

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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(i) subunit alpha-2,Guanine nucleotide-binding protein subunit alpha-13
B: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
F: Single-chain variable fragment ScFv16
G: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
R: Green fluorescent protein,G-protein coupled receptor 55,G-protein coupled receptor 55
hetero molecules


Theoretical massNumber of molelcules
Total (without water)175,9748
Polymers174,6925
Non-polymers1,2823
Water25214
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 ABG

#1: Protein Guanine nucleotide-binding protein G(i) subunit alpha-2,Guanine nucleotide-binding protein subunit alpha-13 / Adenylate cyclase-inhibiting G alpha protein / G alpha-13 / G-protein subunit alpha-13


Mass: 26574.400 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNAI2, GNAI2B, GNA13 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: P04899, UniProt: Q14344
#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: Trichoplusia ni (cabbage looper) / 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
Source: (gene. exp.) Homo sapiens (human) / Gene: GNG2 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: P59768

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Antibody / Protein / Sugars , 3 types, 3 molecules FR

#3: Antibody Single-chain variable fragment ScFv16


Mass: 27068.225 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Trichoplusia ni (cabbage looper)
#5: Protein Green fluorescent protein,G-protein coupled receptor 55,G-protein coupled receptor 55


Mass: 73124.812 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Aequorea victoria (jellyfish), (gene. exp.) Homo sapiens (human)
Gene: GFP, GPR55 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: Q9Y2T6
#6: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}LINUCSPDB-CARE

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Non-polymers , 3 types, 16 molecules

#7: Chemical ChemComp-A1IKH / 3-[4-(2,3-dimethylphenyl)piperazin-1-yl]carbonyl-N,N-dimethyl-4-pyrrolidin-1-yl-benzenesulfonamide / 3-[[4-(2,3-dimethylphenyl)-1-piperazinyl]carbonyl]-N,N-dimethyl-4-(1-pyrrolidinyl)benzenesulfonamide


Mass: 470.627 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C25H34N4O3S / Feature type: SUBJECT OF INVESTIGATION
#8: Chemical ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C27H46O
#9: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 14 / 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

Component
IDNameTypeEntity IDParent-IDSource
1Structure of GPR55 in complex with G13 and synthetic agonist ML184COMPLEX#1-#50MULTIPLE SOURCES
2Guanine nucleotide-binding proteinsCOMPLEX#1-#2, #41RECOMBINANT
3Single-chain variable fragment ScFv16COMPLEX#31RECOMBINANT
4G-protein coupled receptor 55 with a GFP tagCOMPLEX#51RECOMBINANT
Molecular weightValue: 0.18 MDa / Experimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
22Homo sapiens (human)9606
33Mus musculus (house mouse)10090
44Aequorea victoria (jellyfish)6100
54Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
22Trichoplusia ni (cabbage looper)7111
33Trichoplusia ni (cabbage looper)7111
44Trichoplusia ni (cabbage looper)7111
Buffer solutionpH: 7.5
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: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 45 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
4cryoSPARCCTF correction
8PHENIXmodel refinement
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
12cryoSPARCclassification
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 15173387
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.51 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 829193 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0039269
ELECTRON MICROSCOPYf_angle_d0.51212550
ELECTRON MICROSCOPYf_dihedral_angle_d5.9191370
ELECTRON MICROSCOPYf_chiral_restr0.0421410
ELECTRON MICROSCOPYf_plane_restr0.0031600

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