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- PDB-9oq1: Structure of the sweet receptor bound to sucralose in the loose s... -

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Basic information

Entry
Database: PDB / ID: 9oq1
TitleStructure of the sweet receptor bound to sucralose in the loose state, extracellular domain
Components
  • Taste receptor type 1 member 2
  • Taste receptor type 1 member 3
KeywordsSIGNALING PROTEIN / Membrane protein / GPCR
Function / homology
Function and homology information


Class C/3 (Metabotropic glutamate/pheromone receptors) / Sensory perception of sweet, bitter, and umami (glutamate) taste / sweet taste receptor complex / detection of chemical stimulus involved in sensory perception of sweet taste / sweet taste receptor activity / taste receptor activity / sensory perception of umami taste / G alpha (i) signalling events / sensory perception of sweet taste / Class C/3 (Metabotropic glutamate/pheromone receptors) ...Class C/3 (Metabotropic glutamate/pheromone receptors) / Sensory perception of sweet, bitter, and umami (glutamate) taste / sweet taste receptor complex / detection of chemical stimulus involved in sensory perception of sweet taste / sweet taste receptor activity / taste receptor activity / sensory perception of umami taste / G alpha (i) signalling events / sensory perception of sweet taste / Class C/3 (Metabotropic glutamate/pheromone receptors) / positive regulation of cytokinesis / G protein-coupled receptor activity / Sensory perception of sweet, bitter, and umami (glutamate) taste / G alpha (i) signalling events / receptor complex / G protein-coupled receptor signaling pathway / Golgi apparatus / membrane / plasma membrane
Similarity search - Function
GPCR, family 3, extracellular calcium-sensing receptor-related / G-protein coupled receptors family 3 signature 2. / GPCR, family 3, nine cysteines domain / GPCR, family 3, nine cysteines domain superfamily / Nine Cysteines Domain of family 3 GPCR / GPCR, family 3, conserved site / GPCR, family 3 / G-protein coupled receptors family 3 profile. / GPCR family 3, C-terminal / 7 transmembrane sweet-taste receptor of 3 GCPR ...GPCR, family 3, extracellular calcium-sensing receptor-related / G-protein coupled receptors family 3 signature 2. / GPCR, family 3, nine cysteines domain / GPCR, family 3, nine cysteines domain superfamily / Nine Cysteines Domain of family 3 GPCR / GPCR, family 3, conserved site / GPCR, family 3 / G-protein coupled receptors family 3 profile. / GPCR family 3, C-terminal / 7 transmembrane sweet-taste receptor of 3 GCPR / Receptor, ligand binding region / Receptor family ligand binding region / Periplasmic binding protein-like I
Similarity search - Domain/homology
sucralose / Taste receptor type 1 member 2 / Taste receptor type 1 member 3
Similarity search - Component
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.98 Å
AuthorsWang, H. / Chen, X. / Dai, Y. / Lee, C.H.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM143282 United States
CitationJournal: Cell Res / Year: 2025
Title: Structure and activation mechanism of human sweet taste receptor.
Authors: Haolan Wang / Xiao Chen / Yaxin Dai / Shabareesh Pidathala / Yiming Niu / Chen Zhao / Siyu Li / Liang Wang / Chia-Hsueh Lee /
History
DepositionMay 20, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 19, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Taste receptor type 1 member 2
B: Taste receptor type 1 member 3
hetero molecules


Theoretical massNumber of molelcules
Total (without water)121,0573
Polymers120,6592
Non-polymers3981
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

#1: Protein Taste receptor type 1 member 2 / G-protein coupled receptor 71 / Sweet taste receptor T1R2


Mass: 60718.883 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TAS1R2, GPR71, T1R2, TR2 / Production host: Homo sapiens (human) / References: UniProt: Q8TE23
#2: Protein Taste receptor type 1 member 3 / Saccharin preference protein / Sweet taste receptor T1R3


Mass: 59940.020 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: Tas1r3, Sac, T1r3, Tr3 / Production host: Homo sapiens (human) / References: UniProt: Q925D8
#3: Polysaccharide 4-chloro-4-deoxy-alpha-D-galactopyranose-(1-2)-1,6-dichloro-1,6-dideoxy-beta-D-fructofuranose


Type: oligosaccharide, Oligosaccharide / Class: Substrate analog / Mass: 397.634 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: oligosaccharide with reducing-end-to-reducing-end glycosidic bond
References: sucralose
DescriptorTypeProgram
[][b-D-Fruf1chloro6chloro]{[(2+1)][a-D-Galp4chloro]{}}LINUCSPDB-CARE
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 TAS1R2 and mouse TAS1R3 sweet receptor bound to sucralose
Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7
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
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2100 nm / Nominal defocus min: 1100 nm / Cs: 2.7 mm
Image recordingElectron dose: 61.6 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.98 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 87750 / Symmetry type: POINT
RefinementHighest resolution: 2.98 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)

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