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Open data
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Basic information
Entry | Database: PDB / ID: 7xp5 | |||||||||||||||
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Title | Cryo-EM structure of a class T GPCR in ligand-free state | |||||||||||||||
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Function / homology | ![]() bitter taste receptor activity / detection of chemical stimulus involved in sensory perception of bitter taste / Class C/3 (Metabotropic glutamate/pheromone receptors) / ciliary membrane / ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | |||||||||||||||
Biological species | ![]() ![]() ![]() ![]() | |||||||||||||||
Method | ![]() ![]() ![]() | |||||||||||||||
![]() | Liu, Z.J. / Hua, T. / Xu, W.X. / Wu, L.J. | |||||||||||||||
Funding support | ![]()
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![]() | ![]() 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. | |||||||||||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 205.2 KB | Display | ![]() |
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PDB format | ![]() | 157.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 33365MC ![]() 7xp4C ![]() 7xp6C M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 91116.266 Da / Num. of mol.: 1 / Mutation: E131A Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() Gene: celH or egH, TAS2R46 / Production host: ![]() ![]() ![]() |
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#2: Protein | Mass: 30583.334 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() |
#3: Protein | Mass: 39728.426 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() |
#4: Protein | Mass: 7861.143 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() |
#5: Antibody | ![]() Mass: 15271.938 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() |
-Experimental details
-Experiment
Experiment | Method: ![]() |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: ![]() |
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Sample preparation
Component | Name: Complex of GPCR and G protein / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied![]() ![]() |
Specimen support | Grid material: GOLD / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3 |
Vitrification![]() | Instrument: FEI VITROBOT MARK II / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source![]() ![]() |
Electron lens | Mode: BRIGHT FIELD![]() |
Image recording | Electron dose: 60 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.19.2_4158: / Classification: refinement | ||||||||||||||||||||||||
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EM software |
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CTF correction![]() | Type: PHASE FLIPPING ONLY | ||||||||||||||||||||||||
3D reconstruction![]() | Resolution: 3.08 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 176154 / Symmetry type: POINT | ||||||||||||||||||||||||
Atomic model building | Protocol: RIGID BODY FIT | ||||||||||||||||||||||||
Refine LS restraints |
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