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- PDB-9oxb: CryoEM structure of Ggust-coupled TAS2R43 with aristolochic acid I -

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Basic information

Entry
Database: PDB / ID: 9oxb
TitleCryoEM structure of Ggust-coupled TAS2R43 with aristolochic acid I
Components
  • (Guanine nucleotide-binding protein ...) x 3
  • Taste receptor type 2 member 43
  • scFv16
KeywordsSIGNALING PROTEIN / GPCR
Function / homology
Function and homology information


bitter taste receptor activity / sensory perception of bitter taste / taste receptor activity / sensory perception of umami taste / detection of light stimulus involved in visual perception / sensory perception of sweet taste / detection of chemical stimulus involved in sensory perception of bitter taste / motile cilium / Class C/3 (Metabotropic glutamate/pheromone receptors) / ciliary membrane ...bitter taste receptor activity / sensory perception of bitter taste / taste receptor activity / sensory perception of umami taste / detection of light stimulus involved in visual perception / sensory perception of sweet taste / detection of chemical stimulus involved in sensory perception of bitter taste / motile cilium / Class C/3 (Metabotropic glutamate/pheromone receptors) / ciliary membrane / phototransduction, visible light / axoneme / Adenylate cyclase inhibitory pathway / acrosomal vesicle / response to nicotine / G protein-coupled receptor binding / G protein-coupled receptor activity / G-protein beta/gamma-subunit complex binding / 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) / G beta:gamma signalling through BTK / photoreceptor disc membrane / ADP signalling through P2Y purinoceptor 12 / 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 / GPER1 signaling / cellular response to prostaglandin E stimulus / heterotrimeric G-protein complex / G alpha (12/13) signalling events / Inactivation, recovery and regulation of the phototransduction cascade / G-protein beta-subunit binding / extracellular vesicle / sensory perception of taste / Thrombin signalling through proteinase activated receptors (PARs) / signaling receptor complex adaptor activity / retina development in camera-type eye / GTPase binding / fibroblast proliferation / Ca2+ pathway / 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 / Ras protein signal transduction / Extra-nuclear estrogen signaling / cell population proliferation / apical plasma membrane / G protein-coupled receptor signaling pathway / lysosomal membrane / GTPase activity / synapse / GTP binding / protein-containing complex binding / signal transduction / protein-containing complex / extracellular exosome / membrane / metal ion binding / plasma membrane / cytoplasm / cytosol
Similarity search - Function
Taste receptor type 2 / Taste receptor protein (TAS2R) / G-protein alpha subunit, group I / 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. ...Taste receptor type 2 / Taste receptor protein (TAS2R) / G-protein alpha subunit, group I / 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 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
Chem-GOQ / Guanine nucleotide-binding protein G(t) subunit alpha-3 / Taste receptor type 2 member 43 / 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)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsKim, Y. / Gumpper, R.H. / Roth, B.L.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)U24 DK116195 United States
CitationJournal: Nat Struct Mol Biol / Year: 2026
Title: Structural insights into coffee bitter taste perception by TAS2R43 receptor.
Authors: Yoojoong Kim / Ryan H Gumpper / Yuxuan Zhuang / Ron O Dror / Bryan L Roth /
Abstract: Bitter taste functions as a means of both protection against potentially toxic compounds and savoring bitter tasting foods and beverages. Among the 26 bitter taste receptors, taste receptor type 2 ...Bitter taste functions as a means of both protection against potentially toxic compounds and savoring bitter tasting foods and beverages. Among the 26 bitter taste receptors, taste receptor type 2 member 43 (TAS2R43) has been identified as key for recognizing the bitter taste of coffee. TAS2R43 has also been implicated in many other physiological processes, including the regulation of glucagon-like peptide 1 release from the intestine, bronchodilation, innate immunity and metabolism. Here we report cryo-electron microscopy structures of human TAS2R43 coupled with inhibitory G protein or gustducin (G) stabilized by the potent nephrotoxin and carcinogen aristolochic acid I. Both structures revealed that aristolochic acid I binds in a presumed orthosteric pocket shared with other bitter taste receptor. Further structural, functional and computational studies revealed potential modes for coffee's constituents including caffeine and cafestol, which are bitter tastants from coffee. Lastly, long-timescale molecular dynamics simulations identified potential cryptic allosteric pockets in TAS2R43. These structures could accelerate the search for specific bitter taste ligands that ultimately may be therapeutically useful.
History
DepositionJun 3, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 22, 2026Provider: 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(t) subunit alpha-3
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
D: scFv16
R: Taste receptor type 2 member 43
hetero molecules


Theoretical massNumber of molelcules
Total (without water)192,2786
Polymers191,9375
Non-polymers3411
Water905
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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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(t) subunit alpha-3 / Gustducin alpha-3 chain


Mass: 40339.848 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNAT3 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: A8MTJ3
#2: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Transducin beta chain 1


Mass: 42936.668 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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Antibody / Protein , 2 types, 2 molecules DR

#4: Antibody scFv16


Mass: 28668.922 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Spodoptera frugiperda (fall armyworm)
#5: Protein Taste receptor type 2 member 43 / T2R43 / Taste receptor type 2 member 52 / T2R52


Mass: 72130.312 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TAS2R43 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P59537

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Non-polymers , 2 types, 6 molecules

#6: Chemical ChemComp-GOQ / 8-methoxy-6-nitro-naphtho[1,2-e][1,3]benzodioxole-5-carboxylic acid


Mass: 341.272 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C17H11NO7 / Feature type: SUBJECT OF INVESTIGATION
#7: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 5 / 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: GPCR complex 1 / Type: COMPLEX / Entity ID: #1-#5 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.5
SpecimenConc.: 7 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 95 % / Chamber temperature: 277.15 K

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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: 20000 nm / Nominal defocus min: 5000 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
2PHENIXmodel refinement
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 471455 / Symmetry type: POINT
RefinementHighest resolution: 3 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0038714
ELECTRON MICROSCOPYf_angle_d0.51411844
ELECTRON MICROSCOPYf_dihedral_angle_d4.7631197
ELECTRON MICROSCOPYf_chiral_restr0.0411382
ELECTRON MICROSCOPYf_plane_restr0.0041477

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