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- EMDB-65513: Cryo-EM structure of apo-T2R46 in complex with heterotrimeric G p... -

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Basic information

Entry
Database: EMDB / ID: EMD-65513
TitleCryo-EM structure of apo-T2R46 in complex with heterotrimeric G protein
Map data
Sample
  • Complex: Ternary complex of T2R14 with G protein heterotrimeric
    • Protein or peptide: Taste receptor type 2 member 46
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • 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
KeywordsG protein-coupled receptor / Bitter taste receptor 14 / Bitter taste receptor 46 / ligand binding / signal transduction / MEMBRANE PROTEIN
Function / homology
Function and homology information


bitter taste receptor activity / detection of chemical stimulus involved in sensory perception of bitter taste / Class C/3 (Metabotropic glutamate/pheromone receptors) / ciliary membrane / adenylate cyclase inhibitor activity / positive regulation of protein localization to cell cortex / T cell migration / positive regulation of relaxation of smooth muscle / Adenylate cyclase inhibitory pathway / D2 dopamine receptor binding ...bitter taste receptor activity / detection of chemical stimulus involved in sensory perception of bitter taste / Class C/3 (Metabotropic glutamate/pheromone receptors) / ciliary membrane / adenylate cyclase inhibitor activity / positive regulation of protein localization to cell cortex / T cell migration / positive regulation of relaxation of smooth muscle / Adenylate cyclase inhibitory pathway / D2 dopamine receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / G protein-coupled serotonin receptor binding / cellular response to forskolin / regulation of mitotic spindle organization / chemokine-mediated signaling pathway / Regulation of insulin secretion / neuropeptide signaling pathway / response to prostaglandin E / positive regulation of cholesterol biosynthetic process / negative regulation of insulin secretion / G protein-coupled receptor binding / response to peptide hormone / G protein-coupled receptor activity / centriolar satellite / G-protein beta/gamma-subunit complex binding / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / adenylate cyclase-inhibiting 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 / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / 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 / GDP binding / 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 / sperm principal piece / Thrombin signalling through proteinase activated receptors (PARs) / signaling receptor complex adaptor activity / adenylate cyclase-activating G protein-coupled receptor signaling pathway / retina development in camera-type eye / GTPase binding / fibroblast proliferation / G protein activity / midbody / Ca2+ pathway / 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 / cell division / lysosomal membrane / GTPase activity / centrosome / synapse / GTP binding / protein-containing complex binding / nucleolus / magnesium ion binding / Golgi apparatus / signal transduction / extracellular exosome / nucleoplasm / membrane
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
Taste receptor type 2 member 46 / 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)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.7 Å
AuthorsTan Q / Yu Y / Han X / Zhao Q / Wu B
Funding support China, 4 items
OrganizationGrant numberCountry
National Science Foundation (NSF, China)2022YFA1302900 China
National Science Foundation (NSF, China)82121005 China
National Science Foundation (NSF, China)XDB37030100 China
Chinese Academy of SciencesJCYJ-SHFY-2021-008 China
CitationJournal: Nat Struct Mol Biol / Year: 2026
Title: Ligand binding modes of the bitter taste receptor T2R14 and T2R46.
Authors: Qiuxiang Tan / Yu Yu / Xuteng Han / Kezhen Liu / Shuo Han / Mu Wang / Yuan Wei / Yingrong Zhu / Qiuru Chen / Limin Ma / Cuiying Yi / Xiaojing Chu / Beili Wu / Qiang Zhao /
Abstract: Bitter taste receptors (T2Rs) are considered attractive drug targets. However, the ligand recognition and selectivity of these receptors remain elusive, hampering their drug development. Here we ...Bitter taste receptors (T2Rs) are considered attractive drug targets. However, the ligand recognition and selectivity of these receptors remain elusive, hampering their drug development. Here we present seven structures of human T2R14 and T2R46 in apo or ligand-bound state. Combined with molecular docking and mutagenesis data, the structures reveal an extracellular ligand-binding site in T2R14 for most of its ligands, which is different from the intracellular binding site reported recently. In contrast, T2R46 exhibits a conserved binding pocket that accommodates various ligands with distinct interaction patterns. Furthermore, the second extracellular loop in T2R14 and T2R46 acts as a tethered agonist to potentially facilitate agonist response of these two receptors to the weak tastant agonists. These findings could accelerate drug discovery targeting T2Rs.
History
DepositionJul 24, 2025-
Header (metadata) releaseApr 22, 2026-
Map releaseApr 22, 2026-
UpdateMay 6, 2026-
Current statusMay 6, 2026Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_65513.png

Downloads & links

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Map

FileDownload / File: emd_65513.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

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AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 256 pix.
= 274.176 Å		1.07 Å/pix.
x 256 pix.
= 274.176 Å		1.07 Å/pix.
x 256 pix.
= 274.176 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.071 Å
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Histogram (log scale)
Contour LevelBy AUTHOR: 0.5
Minimum - Maximum-5.710925 - 9.665475000000001
Average (Standard dev.)-0.004137773 (±0.11328901)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 274.176 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_65513_half_map_1.map
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Half map: #1

Fileemd_65513_half_map_2.map
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Sample components

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Entire : Ternary complex of T2R14 with G protein heterotrimeric

EntireName: Ternary complex of T2R14 with G protein heterotrimeric
Components
  • Complex: Ternary complex of T2R14 with G protein heterotrimeric
    • Protein or peptide: Taste receptor type 2 member 46
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • 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

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Supramolecule #1: Ternary complex of T2R14 with G protein heterotrimeric

SupramoleculeName: Ternary complex of T2R14 with G protein heterotrimeric
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 10 kDa/nm

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Macromolecule #1: Taste receptor type 2 member 46

MacromoleculeName: Taste receptor type 2 member 46 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 41.543164 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MKTIIALSYI FCLVFADYKD DDMITFLPII FSILIVVTFV IGNFANGFIA LVNSIEWFKR QKISFADQIL TALAVSRVGL LWVLVLNWY ATELNPAFNS IEVRITAYNV WAVINHFSNW LATSLSIFYL LKIANFSNLI FLHLKRRVKS VVLVILLGPL L FLVCHLFV ...String:
MKTIIALSYI FCLVFADYKD DDMITFLPII FSILIVVTFV IGNFANGFIA LVNSIEWFKR QKISFADQIL TALAVSRVGL LWVLVLNWY ATELNPAFNS IEVRITAYNV WAVINHFSNW LATSLSIFYL LKIANFSNLI FLHLKRRVKS VVLVILLGPL L FLVCHLFV INMNQIIWTK EYEGNMTWKI KLRSAMYLSN TTVTILANLV PFTLTLISFL LLICSLCKHL KKMQLHGKGS QD PSMKVHI KALQTVTSFL LLCAIYFLSI IMSVWSFESL ENKPVFMFCE AIAFSYPSTH PFILIWGNKK LKQTFLSVLW HVR YWVKGE FLEVLFQGPW SHPQFEKGGG SGGGSGGSAW SHPQFEK

UniProtKB: Taste receptor type 2 member 46

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Macromolecule #2: Guanine nucleotide-binding protein G(i) subunit alpha-1

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-1
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: 40.458102 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKNTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI ...String:
MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKNTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI PTQQDVLRTR VKTTGIVETH FTFKDLHFKM FDVTAQRSER KKWIHCFEGV TAIIFCVALS DYDLVLAEDE EM NRMHASM KLFDSICNNK WFTDTSIILF LNKKDLFEEK IKKSPLTICY PEYAGSNTYE EAAAYIQCQF EDLNKRKDTK EIY THFTCS TDTKNVQFVF DAVTDVIIKN NLKDCGLF

UniProtKB: Guanine nucleotide-binding protein G(i) subunit alpha-1

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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: 38.744371 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MHHHHHHGSL LQSELDQLRQ EAEQLKNQIR DARKACADAT LSQITNNIDP VGRIQMRTRR TLRGHLAKIY AMHWGTDSRL LVSASQDGK LIIWDSYTTN KVHAIPLRSS WVMTCAYAPS GNYVACGGLD NICSIYNLKT REGNVRVSRE LAGHTGYLSC C RFLDDNQI ...String:
MHHHHHHGSL LQSELDQLRQ EAEQLKNQIR DARKACADAT LSQITNNIDP VGRIQMRTRR TLRGHLAKIY AMHWGTDSRL LVSASQDGK LIIWDSYTTN KVHAIPLRSS WVMTCAYAPS GNYVACGGLD NICSIYNLKT REGNVRVSRE LAGHTGYLSC C RFLDDNQI VTSSGDTTCA LWDIETGQQT TTFTGHTGDV MSLSLAPDTR LFVSGACDAS AKLWDVREGM CRQTFTGHES DI NAICFFP NGNAFATGSD DATCRLFDLR ADQELMTYSH DNIICGITSV SFSKSGRLLL AGYDDFNCNV WDALKADRAG VLA GHDNRV SCLGVTDDGM AVATGSWDSF LKIWN

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 frugiperda (fall armyworm)
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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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration2.0 mg/mL
BufferpH: 7.5 / Component - Concentration: 2.8 mg/ml / Component - Formula: 150mM / Component - Name: sodium chloride
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV / Details: blot for 1s.
DetailsThis sample was monodisperse

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Electron microscopy

MicroscopeFEI TECNAI F30
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 2 / Number real images: 9856 / Average exposure time: 2.0 sec. / Average electron dose: 60.0 e/Å2 / Details: Images were collected in movie-mode
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Tecnai F30 / Image courtesy: FEI Company

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Image processing

DetailsThe selected images were 20eV using GIF-Quantum LS Imaging energy filter
Particle selectionNumber selected: 6170582
CTF correctionSoftware - Name: Gctf (ver. v1.06) / Type: NONE
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

7x9a

Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 1968661
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE
Final 3D classificationSoftware - Name: RELION (ver. 3.0)

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Atomic model buiding 1

Initial modelPDB ID:

7x9a


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Overall B value: 31.78
Output model

PDB-9w0r:
Cryo-EM structure of apo-T2R46 in complex with heterotrimeric G protein

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