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- EMDB-43647: CryoEM structure of Gi-coupled TAS2R14 with cholesterol and an in... -

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Entry
Database: EMDB / ID: EMD-43647
TitleCryoEM structure of Gi-coupled TAS2R14 with cholesterol and an intracellular tastant
Map dataGlobally Refined Map
Sample
  • Complex: Ternary complex of TAS2R14 with Gi heterotrimer
    • 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
    • Protein or peptide: scFv16
    • Protein or peptide: Taste receptor type 2 member 14
  • Ligand: 4-methyl-N-[(2M)-2-(1H-tetrazol-5-yl)phenyl]-6-(trifluoromethyl)pyrimidin-2-amine
  • Ligand: CHOLESTEROL
KeywordsGPCR / Complex / SIGNALING PROTEIN / Taste receptor
Function / homology
Function and homology information


bitter taste receptor activity / taste receptor activity / detection of chemical stimulus involved in sensory perception of bitter taste / Class C/3 (Metabotropic glutamate/pheromone receptors) / T cell migration / Adenylate cyclase inhibitory pathway / positive regulation of protein localization to cell cortex / regulation of cAMP-mediated signaling / D2 dopamine receptor binding / G protein-coupled serotonin receptor binding ...bitter taste receptor activity / taste receptor activity / detection of chemical stimulus involved in sensory perception of bitter taste / Class C/3 (Metabotropic glutamate/pheromone receptors) / T cell migration / Adenylate cyclase inhibitory pathway / positive regulation of protein localization to cell cortex / regulation of cAMP-mediated signaling / D2 dopamine receptor binding / G protein-coupled serotonin receptor binding / regulation of mitotic spindle organization / cellular response to forskolin / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / Regulation of insulin secretion / G protein-coupled receptor binding / G protein-coupled receptor activity / G-protein beta/gamma-subunit complex binding / Olfactory Signaling Pathway / Activation of the phototransduction cascade / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / G-protein activation / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Prostacyclin signalling through prostacyclin receptor / Glucagon signaling in metabolic regulation / response to peptide hormone / G beta:gamma signalling through CDC42 / G beta:gamma signalling through BTK / ADP signalling through P2Y purinoceptor 12 / Sensory perception of sweet, bitter, and umami (glutamate) taste / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / photoreceptor disc membrane / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / sensory perception of taste / ADP signalling through P2Y purinoceptor 1 / 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 / GDP binding / cellular response to prostaglandin E stimulus / Inactivation, recovery and regulation of the phototransduction cascade / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / GTPase binding / retina development in camera-type eye / Ca2+ pathway / phospholipase C-activating G protein-coupled receptor signaling pathway / cell cortex / midbody / fibroblast proliferation / G alpha (i) signalling events / G alpha (s) signalling events / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / G alpha (q) signalling events / Ras protein signal transduction / cell population proliferation / Extra-nuclear estrogen signaling / G protein-coupled receptor signaling pathway / cell division / lysosomal membrane / GTPase activity / centrosome / synapse / protein-containing complex binding / nucleolus / GTP binding / magnesium ion binding / signal transduction / extracellular exosome / nucleoplasm / membrane / plasma membrane / cytosol / cytoplasm
Similarity search - Function
Taste receptor type 2 / Taste receptor protein (TAS2R) / 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. ...Taste receptor type 2 / Taste receptor protein (TAS2R) / 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 / 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. / WD domain, G-beta repeat / 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
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 / Taste receptor type 2 member 14
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.68 Å
AuthorsKim Y / Gumpper RH / Roth BL
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)DK116195 United States
CitationJournal: Nature / Year: 2024
Title: Bitter taste receptor activation by cholesterol and an intracellular tastant.
Authors: Yoojoong Kim / Ryan H Gumpper / Yongfeng Liu / D Dewran Kocak / Yan Xiong / Can Cao / Zhijie Deng / Brian E Krumm / Manish K Jain / Shicheng Zhang / Jian Jin / Bryan L Roth /
Abstract: Bitter taste sensing is mediated by type 2 taste receptors (TAS2Rs (also known as T2Rs)), which represent a distinct class of G-protein-coupled receptors. Among the 26 members of the TAS2Rs, TAS2R14 ...Bitter taste sensing is mediated by type 2 taste receptors (TAS2Rs (also known as T2Rs)), which represent a distinct class of G-protein-coupled receptors. Among the 26 members of the TAS2Rs, TAS2R14 is highly expressed in extraoral tissues and mediates the responses to more than 100 structurally diverse tastants, although the molecular mechanisms for recognizing diverse chemicals and initiating cellular signalling are still poorly understood. Here we report two cryo-electron microscopy structures for TAS2R14 complexed with G (also known as gustducin) and G. Both structures have an orthosteric binding pocket occupied by endogenous cholesterol as well as an intracellular allosteric site bound by the bitter tastant cmpd28.1, including a direct interaction with the α5 helix of G and G. Computational and biochemical studies validate both ligand interactions. Our functional analysis identified cholesterol as an orthosteric agonist and the bitter tastant cmpd28.1 as a positive allosteric modulator with direct agonist activity at TAS2R14. Moreover, the orthosteric pocket is connected to the allosteric site via an elongated cavity, which has a hydrophobic core rich in aromatic residues. Our findings provide insights into the ligand recognition of bitter taste receptors and suggest activities of TAS2R14 beyond bitter taste perception via intracellular allosteric tastants.
History
DepositionFeb 7, 2024-
Header (metadata) releaseApr 3, 2024-
Map releaseApr 3, 2024-
UpdateOct 16, 2024-
Current statusOct 16, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_43647.png

Downloads & links

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Map

FileDownload / File: emd_43647.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationGlobally Refined Map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.88 Å/pix.
x 300 pix.
= 262.8 Å		0.88 Å/pix.
x 300 pix.
= 262.8 Å		0.88 Å/pix.
x 300 pix.
= 262.8 Å

Surface

Projections

Slices (1/3)

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Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.876 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0426
Minimum - Maximum-0.0017974812 - 1.6454061
Average (Standard dev.)0.00092290563 (±0.0212858)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 262.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: Locally Refined Map

Fileemd_43647_additional_1.map
AnnotationLocally Refined Map
Projections & Slices
AxesZYX

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Half map: #2

Fileemd_43647_half_map_1.map
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Histogram (log scale)

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Half map: #1

Fileemd_43647_half_map_2.map
Projections & Slices
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Sample components

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Entire : Ternary complex of TAS2R14 with Gi heterotrimer

EntireName: Ternary complex of TAS2R14 with Gi heterotrimer
Components
  • Complex: Ternary complex of TAS2R14 with Gi heterotrimer
    • 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
    • Protein or peptide: scFv16
    • Protein or peptide: Taste receptor type 2 member 14
  • Ligand: 4-methyl-N-[(2M)-2-(1H-tetrazol-5-yl)phenyl]-6-(trifluoromethyl)pyrimidin-2-amine
  • Ligand: CHOLESTEROL

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Supramolecule #1: Ternary complex of TAS2R14 with Gi heterotrimer

SupramoleculeName: Ternary complex of TAS2R14 with Gi heterotrimer / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Source (natural)Organism: Homo sapiens (human)

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

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-1
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.414047 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 FDVGAQRSER 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 #2: 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: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 42.805473 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: HHHHHHLEVL FQGPGSSGSE LDQLRQEAEQ LKNQIRDARK ACADATLSQI TNNIDPVGRI QMRTRRTLRG HLAKIYAMHW GTDSRLLVS ASQDGKLIIW DSYTTNKVHA IPLRSSWVMT CAYAPSGNYV ACGGLDNICS IYNLKTREGN VRVSRELAGH T GYLSCCRF ...String:
HHHHHHLEVL FQGPGSSGSE LDQLRQEAEQ LKNQIRDARK ACADATLSQI TNNIDPVGRI QMRTRRTLRG HLAKIYAMHW GTDSRLLVS ASQDGKLIIW DSYTTNKVHA IPLRSSWVMT CAYAPSGNYV ACGGLDNICS IYNLKTREGN VRVSRELAGH T GYLSCCRF LDDNQIVTSS GDTTCALWDI ETGQQTTTFT GHTGDVMSLS LAPDTRLFVS GACDASAKLW DVREGMCRQT FT GHESDIN AICFFPNGNA FATGSDDATC RLFDLRADQE LMTYSHDNII CGITSVSFSK SGRLLLAGYD DFNCNVWDAL KAD RAGVLA GHDNRVSCLG VTDDGMAVAT GSWDSFLKIW NGGSGGGGSG GSSSGGGGSG GGGSGGSSSG GVSGWRLFKK ISGG S

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #3: 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: 3 / 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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Macromolecule #4: scFv16

MacromoleculeName: scFv16 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 28.668922 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS ...String:
DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS NGNTYLYWFL QRPGQSPQLL IYRMSNLASG VPDRFSGSGS GTAFTLTISR LEAEDVGVYY CMQHLEYPLT FG AGTKLEL KAAALEVLFQ GPHHHHHHHH

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Macromolecule #5: Taste receptor type 2 member 14

MacromoleculeName: Taste receptor type 2 member 14 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 70.959812 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: DYKDDDDAKL QTMHHHHHHH HHHENLYFQG GTTMADLEDN WETLNDNLKV IEKADNAAQV KDALTKMRAA ALDAQKATPP KLEDKSPDS PEMKDFRHGF DILVGQIDDA LKLANEGKVK EAQAAAEQLK TTRNAYIQKY LGSTLEVLFQ GPMGGVIKSI F TFVLIVEF ...String:
DYKDDDDAKL QTMHHHHHHH HHHENLYFQG GTTMADLEDN WETLNDNLKV IEKADNAAQV KDALTKMRAA ALDAQKATPP KLEDKSPDS PEMKDFRHGF DILVGQIDDA LKLANEGKVK EAQAAAEQLK TTRNAYIQKY LGSTLEVLFQ GPMGGVIKSI F TFVLIVEF IIGNLGNSFI ALVNCIDWVK GRKISSVDRI LTALAISRIS LVWLIFGSWC VSVFFPALFA TEKMFRMLTN IW TVINHFS VWLATGLGTF YFLKIANFSN SIFLYLKWRV KKVVLVLLLV TSVFLFLNIA LINIHINASI NGYRRNKTCS SDS SNFTRF SSLIVLTSTV FIFIPFTLSL AMFLLLIFSM WKHRKKMQHT VKISGDASTR AHRGVKSVIT FFLLYAIFSL SFFI SVWTS ERLEENLIIL SQVMGMAYPS CHSCVLILGN KKLRQASLSV LLWLRYMFGS AGSAGSGGSG GGSGGGGSGG SSSGG VFTL EDFVGDWEQT AAYNLDQVLE QGGVSSLLQN LAVSVTPIQR IVRSGENALK IDIHVIIPYE GLSADQMAQI EEVFKV VYP VDDHHFKVIL PYGTLVIDGV TPNMLNYFGR PYEGIAVFDG KKITVTGTLW NGNKIIDERL ITPDGSMLFR VTIN

UniProtKB: Taste receptor type 2 member 14

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Macromolecule #6: 4-methyl-N-[(2M)-2-(1H-tetrazol-5-yl)phenyl]-6-(trifluoromethyl)p...

MacromoleculeName: 4-methyl-N-[(2M)-2-(1H-tetrazol-5-yl)phenyl]-6-(trifluoromethyl)pyrimidin-2-amine
type: ligand / ID: 6 / Number of copies: 1 / Formula: A1AEI
Molecular weightTheoretical: 321.261 Da

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Macromolecule #7: CHOLESTEROL

MacromoleculeName: CHOLESTEROL / type: ligand / ID: 7 / Number of copies: 1 / Formula: CLR
Molecular weightTheoretical: 386.654 Da
Chemical component information

ChemComp-CLR:
CHOLESTEROL

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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

BufferpH: 7.5
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300
VitrificationCryogen name: ETHANE-PROPANE / Chamber humidity: 100 %

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: OTHER
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: OTHER / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 2793137
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.68 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.2) / Number images used: 787890
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: OTHER

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