+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-33365 | |||||||||||||||
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Title | Cryo-EM structure of a class T GPCR in ligand-free state | |||||||||||||||
Map data | ||||||||||||||||
Sample |
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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 / cellulase / cellulase activity / cellulose catabolic process / G protein-coupled receptor activity / Olfactory Signaling Pathway / Activation of the phototransduction cascade ...bitter taste receptor activity / detection of chemical stimulus involved in sensory perception of bitter taste / Class C/3 (Metabotropic glutamate/pheromone receptors) / ciliary membrane / cellulase / cellulase activity / cellulose catabolic process / G protein-coupled receptor activity / 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 activation / G protein-coupled acetylcholine receptor signaling pathway / 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 / G beta:gamma signalling through CDC42 / ADP signalling through P2Y purinoceptor 12 / G beta:gamma signalling through BTK / Sensory perception of sweet, bitter, and umami (glutamate) taste / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / photoreceptor disc membrane / Adrenaline,noradrenaline inhibits insulin secretion / Glucagon-type ligand receptors / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / cellular response to catecholamine stimulus / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADORA2B mediated anti-inflammatory cytokines production / adenylate cyclase-activating dopamine receptor signaling pathway / ADP signalling through P2Y purinoceptor 1 / G beta:gamma signalling through PI3Kgamma / cellular response to prostaglandin E stimulus / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / sensory perception of taste / GPER1 signaling / G-protein beta-subunit binding / heterotrimeric G-protein complex / Inactivation, recovery and regulation of the phototransduction cascade / G alpha (12/13) signalling events / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / retina development in camera-type eye / GTPase binding / Ca2+ pathway / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (i) signalling events / fibroblast proliferation / G alpha (s) signalling events / G alpha (q) signalling events / Ras protein signal transduction / cell population proliferation / Extra-nuclear estrogen signaling / G protein-coupled receptor signaling pathway / lysosomal membrane / GTPase activity / synapse / protein-containing complex binding / signal transduction / extracellular exosome / membrane / plasma membrane / cytosol / cytoplasm Similarity search - Function | |||||||||||||||
Biological species | Homo sapiens (human) | |||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.08 Å | |||||||||||||||
Authors | Liu ZJ / Hua T / Xu WX / Wu LJ | |||||||||||||||
Funding support | China, 4 items
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Citation | Journal: Science / Year: 2022 Title: Structural basis for strychnine activation of human bitter taste receptor TAS2R46. Authors: Weixiu Xu / Lijie Wu / Shenhui Liu / Xiao Liu / Xiaoling Cao / Cui Zhou / Jinyi Zhang / You Fu / Yu Guo / Yiran Wu / Qiwen Tan / Ling Wang / Junlin Liu / Longquan Jiang / Zhongbo Fan / Yuan ...Authors: Weixiu Xu / Lijie Wu / Shenhui Liu / Xiao Liu / Xiaoling Cao / Cui Zhou / Jinyi Zhang / You Fu / Yu Guo / Yiran Wu / Qiwen Tan / Ling Wang / Junlin Liu / Longquan Jiang / Zhongbo Fan / Yuan Pei / Jingyi Yu / Jianjun Cheng / Suwen Zhao / Xiaojiang Hao / Zhi-Jie Liu / Tian Hua / Abstract: Taste sensing is a sophisticated chemosensory process, and bitter taste perception is mediated by type 2 taste receptors (TAS2Rs), or class T G protein-coupled receptors. Understanding the detailed ...Taste sensing is a sophisticated chemosensory process, and bitter taste perception is mediated by type 2 taste receptors (TAS2Rs), or class T G protein-coupled receptors. Understanding the detailed molecular mechanisms behind taste sensation is hindered by a lack of experimental receptor structures. Here, we report the cryo-electron microscopy structures of human TAS2R46 complexed with chimeric mini-G protein gustducin, in both strychnine-bound and apo forms. Several features of TAS2R46 are disclosed, including distinct receptor structures that compare with known GPCRs, a new "toggle switch," activation-related motifs, and precoupling with mini-G protein gustducin. Furthermore, the dynamic extracellular and more-static intracellular parts of TAS2R46 suggest possible diverse ligand-recognition and activation processes. This study provides a basis for further exploration of other bitter taste receptors and their therapeutic applications. | |||||||||||||||
History |
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-Structure visualization
Supplemental images |
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-Downloads & links
-EMDB archive
Map data | emd_33365.map.gz | 57 MB | EMDB map data format | |
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Header (meta data) | emd-33365-v30.xml emd-33365.xml | 22.2 KB 22.2 KB | Display Display | EMDB header |
Images | emd_33365.png | 48.5 KB | ||
Others | emd_33365_half_map_1.map.gz emd_33365_half_map_2.map.gz | 59.3 MB 59.3 MB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-33365 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-33365 | HTTPS FTP |
-Related structure data
Related structure data | 7xp5MC 7xp4C 7xp6C M: atomic model generated by this map C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_33365.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||
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Voxel size | X=Y=Z: 1.04 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #2
File | emd_33365_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_33365_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Sample components
-Entire : Complex of GPCR and G protein
Entire | Name: Complex of GPCR and G protein |
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Components |
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-Supramolecule #1: Complex of GPCR and G protein
Supramolecule | Name: Complex of GPCR and G protein / type: complex / Chimera: Yes / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: Homo sapiens (human) |
Recombinant expression | Organism: Spodoptera frugiperda (fall armyworm) |
-Macromolecule #1: Endoglucanase H,Taste receptor type 2 member 46,Bitter taste rece...
Macromolecule | Name: Endoglucanase H,Taste receptor type 2 member 46,Bitter taste receptor T2R46 type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 91.116266 KDa |
Recombinant expression | Organism: Spodoptera frugiperda (fall armyworm) |
Sequence | String: MKTIIALSYI FCLVFADYKD DDDAHHHHHH HHHHENLYFQ SGRAMASNYN SGLKIGAWVG TQPSESAIKS FQELQGRKLD IVHQFINWS TDFSWVRPYA DAVYNNGSIL MITWEPWEYN TVDIKNGKAD AYITRMAQDM KAYGKEIWLR PLHAANGDWY P WAIGYSSR ...String: MKTIIALSYI FCLVFADYKD DDDAHHHHHH HHHHENLYFQ SGRAMASNYN SGLKIGAWVG TQPSESAIKS FQELQGRKLD IVHQFINWS TDFSWVRPYA DAVYNNGSIL MITWEPWEYN TVDIKNGKAD AYITRMAQDM KAYGKEIWLR PLHAANGDWY P WAIGYSSR VNTNETYIAA FRHIVDIFRA NGATNVKWVF NVNCDNVGNG TSYLGHYPGD NYVDYTSIDG YNWGTTQSWG SQ WQSFDQV FSRAYQALAS INKPIIIAEF ASAEIGGNKA RWITEAYNSI RTSYNKVIAA VWFHENKETD WRINSSPEAL AAY REAIGA ITFLPIIFSI LIVVTFVIGN FANGFIALVN SIEWFKRQKI SFADQILTAL AVSRVGLLWV LVLNWYATEL NPAF NSIEV RITAYNVWAV INHFSNWLAT SLSIFYLLKI ANFSNLIFLH LKRRVKSVVL VILLGPLLFL VCHLFVINMN QIIWT KEYE GNMTWKIKLR SAMYLSNTTV TILANLVPFT LTLISFLLLI CSLCKHLKKM QLHGKGSQDP SMKVHIKALQ TVTSFL LLC AIYFLSIIMS VWSFESLENK PVFMFCEAIA FSYPSTHPFI LIWGNKKLKQ TFLSVLWHVR YWVKGEKPSS SGSGSSG SG SSVFTLEDFV GDWEQTAAYN LDQVLEQGGV SSLLQNLAVS VTPIQRIVRS GENALKIDIH VIIPYEGLSA DQMAQIEE V FKVVYPVDDH HFKVILPYGT LVIDGVTPNM LNYFGRPYEG IAVFDGKKIT VTGTLWNGNK IIDERLITPD GSMLFRVTI NS |
-Macromolecule #2: Guanine nucleotide-binding protein G(t) subunit alpha-3
Macromolecule | Name: Guanine nucleotide-binding protein G(t) subunit alpha-3 type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 30.583334 KDa |
Recombinant expression | Organism: Spodoptera frugiperda (fall armyworm) |
Sequence | String: MDYKDDDDKE NLYFQSNSKT EDQRNEEKAQ REANKKIEKQ LQKDKQVYRA THRLLLLGAD NSGKSTIVKQ MRILHGGSGG SGGTSGIFE TKFQVDKVNF HMFDVGGQRD ERRKWIQCFN DVTAIIFVVD SSDYNRLQEA LNDFKSIWNN RWLRTISVIL F LNKQDLLA ...String: MDYKDDDDKE NLYFQSNSKT EDQRNEEKAQ REANKKIEKQ LQKDKQVYRA THRLLLLGAD NSGKSTIVKQ MRILHGGSGG SGGTSGIFE TKFQVDKVNF HMFDVGGQRD ERRKWIQCFN DVTAIIFVVD SSDYNRLQEA LNDFKSIWNN RWLRTISVIL F LNKQDLLA EKVLAGKSKI EDYFPEFARY TTPEDATPEP GEDPRVTRAK YFIRDEFLRI STASGDGRHY CYPHFTCAVD TQ NVKFVFD AVTDIIIKEN LKDCGLF |
-Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Macromolecule | Name: 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 |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 39.728426 KDa |
Recombinant expression | Organism: Spodoptera frugiperda (fall armyworm) |
Sequence | String: MSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKLI IWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC RFLDDNQIVT S SGDTTCAL ...String: MSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKLI IWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC RFLDDNQIVT S SGDTTCAL WDIETGQQTT TFTGHTGDVM SLSLAPDTRL FVSGACDASA KLWDVREGMC RQTFTGHESD INAICFFPNG NA FATGSDD ATCRLFDLRA DQELMTYSHD NIICGITSVS FSKSGRLLLA GYDDFNCNVW DALKADRAGV LAGHDNRVSC LGV TDDGMA VATGSWDSFL KIWNGSSGGG GSGGGGSSGV SGWRLFKKIS |
-Macromolecule #4: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
Macromolecule | Name: 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 |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 7.861143 KDa |
Recombinant expression | Organism: Spodoptera frugiperda (fall armyworm) |
Sequence | String: MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L |
-Macromolecule #5: Nanobody 35
Macromolecule | Name: Nanobody 35 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 15.271938 KDa |
Recombinant expression | Organism: Escherichia coli (E. coli) |
Sequence | String: MQVQLQESGG GLVQPGGSLR LSCAASGFTF SNYKMNWVRQ APGKGLEWVS DISQSGASIS YTGSVKGRFT ISRDNAKNTL YLQMNSLKP EDTAVYYCAR CPAPFTRDCF DVTSTTYAYR GQGTQVTVSS HHHHHHEPEA |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Buffer | pH: 7.5 |
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Grid | Model: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 400 |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK II |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2.2 µm / Nominal defocus min: 1.2 µm |
Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 60.0 e/Å2 |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
-Image processing
CTF correction | Software - Name: cryoSPARC (ver. 3.3.1) |
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Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final 3D classification | Number classes: 2 / Software - Name: cryoSPARC (ver. 3.3.1) |
Final angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.1) |
Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.08 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 176154 |
-Atomic model buiding 1
Refinement | Protocol: RIGID BODY FIT |
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Output model | PDB-7xp5: |