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Open data
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Basic information
Entry | Database: PDB / ID: 8t3q | ||||||
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Title | Cryo-EM structure of the DHA bound FFA4-Gq complex | ||||||
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Function / homology | ![]() negative regulation of somatostatin secretion / ghrelin secretion / Free fatty acid receptors / positive regulation of glucagon secretion / ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() ![]() ![]() | ||||||
Method | ![]() ![]() ![]() | ||||||
![]() | Zhang, X. / Tikhonova, I. / Milligan, G. / Zhang, C. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis for the ligand recognition and signaling of free fatty acid receptors. Authors: Xuan Zhang / Abdul-Akim Guseinov / Laura Jenkins / Kunpeng Li / Irina G Tikhonova / Graeme Milligan / Cheng Zhang / ![]() ![]() Abstract: Free fatty acid receptors 1 to 4 (FFA1 to FFA4) are class A G protein-coupled receptors (GPCRs). FFA1 to FFA3 share substantial sequence similarity, whereas FFA4 is unrelated. However, FFA1 and FFA4 ...Free fatty acid receptors 1 to 4 (FFA1 to FFA4) are class A G protein-coupled receptors (GPCRs). FFA1 to FFA3 share substantial sequence similarity, whereas FFA4 is unrelated. However, FFA1 and FFA4 are activated by long-chain fatty acids, while FFA2 and FFA3 respond to short-chain fatty acids generated by intestinal microbiota. FFA1, FFA2, and FFA4 are potential drug targets for metabolic and inflammatory conditions. Here, we determined the active structures of FFA1 and FFA4 bound to docosahexaenoic acid, FFA4 bound to the synthetic agonist TUG-891, and butyrate-bound FFA2, each complexed with an engineered heterotrimeric G protein (miniG), by cryo-electron microscopy. Together with computational simulations and mutagenesis studies, we elucidated the similarities and differences in the binding modes of fatty acid ligands to their respective GPCRs. Our findings unveiled distinct mechanisms of receptor activation and G protein coupling. We anticipate that these outcomes will facilitate structure-based drug development and underpin future research on this group of GPCRs. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 213.5 KB | Display | ![]() |
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PDB format | ![]() | 167.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 41008MC ![]() 8t3oC ![]() 8t3sC ![]() 8t3vC 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
-Guanine nucleotide-binding protein ... , 3 types, 3 molecules ABG
#1: Protein | Mass: 26670.275 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() |
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#2: Protein | Mass: 37516.941 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() |
#4: Protein | Mass: 6261.229 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() |
-Antibody / Protein / Non-polymers , 3 types, 3 molecules NR![](data/chem/img/HXA.gif)
![](data/chem/img/HXA.gif)
#3: Antibody | Mass: 28634.797 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() ![]() |
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#5: Protein | Mass: 34670.480 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() |
#6: Chemical | ChemComp-HXA / ![]() |
-Details
Has ligand of interest | Y |
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-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: DHA-FFA4-miniGq complex / Type: COMPLEX / Entity ID: #1-#5 / 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![]() ![]() |
Vitrification![]() | Cryogen name: ETHANE |
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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: 55 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
CTF correction![]() | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction![]() | Resolution: 3.14 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 380284 / Symmetry type: POINT |