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- PDB-9ebh: Human adenosine A3 receptor Gi1 complex bound to adenosine -

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Basic information

Entry
Database: PDB / ID: 9ebh
TitleHuman adenosine A3 receptor Gi1 complex bound to adenosine
Components
  • (Guanine nucleotide-binding protein ...) x 3
  • Adenosine receptor A3
  • Antibody fragment scFv16|Mus musculus (10090)
KeywordsMEMBRANE PROTEIN / G protein-coupled receptor / adenosine binding / seven transmembrane protein
Function / homology
Function and homology information


regulation of norepinephrine secretion / Adenosine P1 receptors / G protein-coupled adenosine receptor activity / G protein-coupled adenosine receptor signaling pathway / : / regulation of heart contraction / activation of adenylate cyclase activity / adenylate cyclase inhibitor activity / positive regulation of protein localization to cell cortex / T cell migration ...regulation of norepinephrine secretion / Adenosine P1 receptors / G protein-coupled adenosine receptor activity / G protein-coupled adenosine receptor signaling pathway / : / regulation of heart contraction / activation of adenylate cyclase activity / adenylate cyclase inhibitor activity / positive regulation of protein localization to cell cortex / T cell migration / Adenylate cyclase inhibitory pathway / D2 dopamine receptor binding / response to prostaglandin E / adenylate cyclase regulator activity / G protein-coupled serotonin receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / presynaptic modulation of chemical synaptic transmission / cellular response to forskolin / negative regulation of cell migration / regulation of mitotic spindle organization / Regulation of insulin secretion / positive regulation of cholesterol biosynthetic process / negative regulation of insulin secretion / G protein-coupled receptor binding / response to peptide hormone / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / response to wounding / Schaffer collateral - CA1 synapse / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / centriolar satellite / 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 / G beta:gamma signalling through CDC42 / Prostacyclin signalling through prostacyclin receptor / 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 / GDP binding / Vasopressin regulates renal water homeostasis via Aquaporins / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / ADP signalling through P2Y purinoceptor 1 / cellular response to catecholamine stimulus / 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 / GPER1 signaling / G-protein beta-subunit binding / cellular response to prostaglandin E stimulus / heterotrimeric G-protein complex / Inactivation, recovery and regulation of the phototransduction cascade / G alpha (12/13) signalling events / extracellular vesicle / sensory perception of taste / Thrombin signalling through proteinase activated receptors (PARs) / signaling receptor complex adaptor activity / G protein activity / retina development in camera-type eye / presynaptic membrane / GTPase binding / Ca2+ pathway / fibroblast proliferation / midbody / cell cortex / 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 / Extra-nuclear estrogen signaling / cell population proliferation / ciliary basal body / G protein-coupled receptor signaling pathway / inflammatory response / negative regulation of cell population proliferation / lysosomal membrane / cell division / GTPase activity / synapse / dendrite / centrosome / GTP binding / protein-containing complex binding / nucleolus
Similarity search - Function
Adenosine A3 receptor / Adenosine receptor / 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 ...Adenosine A3 receptor / Adenosine receptor / 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
ADENOSINE / Adenosine receptor A3 / 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)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsZhang, L. / Mobbs, J.I. / Glukhova, A. / Thal, D.M.
Funding support Australia, 3items
OrganizationGrant numberCountry
National Health and Medical Research Council (NHMRC, Australia)1196951 Australia
National Health and Medical Research Council (NHMRC, Australia)138448 Australia
Australian Research Council (ARC)LP180100560 Australia
Citation
Journal: Nat Commun / Year: 2025
Title: Molecular basis of ligand binding and receptor activation at the human A adenosine receptor.
Authors: Liudi Zhang / Jesse I Mobbs / Felix M Bennetts / Hariprasad Venugopal / Anh T N Nguyen / Arthur Christopoulos / Daan van der Es / Laura H Heitman / Lauren T May / Alisa Glukhova / David M Thal /
Abstract: Adenosine receptors (ARs: AAR, AAR, AAR, and AAR) are crucial therapeutic targets; however, developing selective, efficacious drugs for them remains a significant challenge. Here, we present high- ...Adenosine receptors (ARs: AAR, AAR, AAR, and AAR) are crucial therapeutic targets; however, developing selective, efficacious drugs for them remains a significant challenge. Here, we present high-resolution cryo-electron microscopy (cryo-EM) structures of the human AAR in three distinct functional states: bound to the endogenous agonist adenosine, the clinically relevant agonist Piclidenoson, and the covalent antagonist LUF7602. These structures, complemented by mutagenesis and pharmacological studies, reveal an AAR activation mechanism that involves an extensive hydrogen bond network from the extracellular surface down to the orthosteric binding site. In addition, we identify a cryptic pocket that accommodates the N-iodobenzyl group of Piclidenoson through a ligand-dependent conformational change of M174. Our comprehensive structural and functional characterisation of AAR advances our understanding of adenosine receptor pharmacology and establishes a foundation for developing more selective therapeutics for various disorders, including inflammatory diseases, cancer, and glaucoma.
#1: Journal: Biorxiv / Year: 2025
Title: Molecular basis of ligand binding and receptor activation at the human A3 adenosine receptor
Authors: Zhang, L. / Mobbs, J.I. / Bennetts, F.M. / Venugopal, H. / Nguyen, A.T. / Christopoulos, A. / van der Es, D. / Heitman, L.H. / May, L.T. / Glukhova, A. / Thal, D.M.
History
DepositionNov 12, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 20, 2025Provider: repository / Type: Initial release
Revision 1.1Sep 3, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin / Item: _em_admin.last_update

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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-1
B: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
E: Antibody fragment scFv16|Mus musculus (10090)
G: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
R: Adenosine receptor A3
hetero molecules


Theoretical massNumber of molelcules
Total (without water)154,4846
Polymers154,2175
Non-polymers2671
Water00
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-1 / Adenylate cyclase-inhibiting G alpha protein


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 / Transducin beta chain 1


Mass: 38402.867 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: 7729.947 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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Antibody / Protein / Non-polymers , 3 types, 3 molecules ER

#3: Antibody Antibody fragment scFv16|Mus musculus (10090)


Mass: 26466.486 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Spodoptera frugiperda (fall armyworm)
#5: Protein Adenosine receptor A3


Mass: 41203.633 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ADORA3 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P0DMS8
#6: Chemical ChemComp-ADN / ADENOSINE


Mass: 267.241 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H13N5O4 / Feature type: SUBJECT OF INVESTIGATION

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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: Human A3AR-Gi1-Gb1g2-scFv16 complex. / Type: COMPLEX / Entity ID: #1-#5 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
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: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1500 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.21rc1_5127 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 325569 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 130.81 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00298793
ELECTRON MICROSCOPYf_angle_d0.713711913
ELECTRON MICROSCOPYf_chiral_restr0.04981368
ELECTRON MICROSCOPYf_plane_restr0.00811486
ELECTRON MICROSCOPYf_dihedral_angle_d11.78763127

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