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- EMDB-45732: Cryo-EM structure of Gq-coupled FFA2 in complex with TUG-1375 and... -
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Open data
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Basic information
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Title | Cryo-EM structure of Gq-coupled FFA2 in complex with TUG-1375 and 4-CMTB | |||||||||
![]() | FFA2-TUG1375-4CMTB_half_A | |||||||||
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![]() | GPCR / agonist / MEMBRANE PROTEIN | |||||||||
Function / homology | ![]() positive regulation of acute inflammatory response to non-antigenic stimulus / regulation of peptide hormone secretion / regulation of acute inflammatory response / leukocyte chemotaxis involved in inflammatory response / mucosal immune response / Free fatty acid receptors / positive regulation of cytokine production involved in immune response / cell surface pattern recognition receptor signaling pathway / lipid storage / cellular response to fatty acid ...positive regulation of acute inflammatory response to non-antigenic stimulus / regulation of peptide hormone secretion / regulation of acute inflammatory response / leukocyte chemotaxis involved in inflammatory response / mucosal immune response / Free fatty acid receptors / positive regulation of cytokine production involved in immune response / cell surface pattern recognition receptor signaling pathway / lipid storage / cellular response to fatty acid / fat cell differentiation / ligand-gated ion channel signaling pathway / positive regulation of chemokine production / positive regulation of interleukin-8 production / cell projection / negative regulation of insulin secretion / G protein-coupled receptor activity / positive regulation of insulin secretion / 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-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 / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / Sensory perception of sweet, bitter, and umami (glutamate) taste / 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 / ADP signalling through P2Y purinoceptor 1 / ADORA2B mediated anti-inflammatory cytokines production / G beta:gamma signalling through PI3Kgamma / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / adenylate cyclase-activating dopamine receptor signaling pathway / GPER1 signaling / Inactivation, recovery and regulation of the phototransduction cascade / cellular response to prostaglandin E stimulus / glucose homeostasis / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / retina development in camera-type eye / GTPase binding / Ca2+ pathway / fibroblast proliferation / 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 / Ras protein signal transduction / Extra-nuclear estrogen signaling / cell population proliferation / G protein-coupled receptor signaling pathway / lysosomal membrane / GTPase activity / synapse / lipid binding / protein-containing complex binding / signal transduction / extracellular exosome / membrane / plasma membrane / cytosol / cytoplasm Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.19 Å | |||||||||
![]() | Zhang X / Tikhonova I / Milligan G / Zhang C | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Allosteric modulation and biased signalling at free fatty acid receptor 2. Authors: Xuan Zhang / Abdul-Akim Guseinov / Laura Jenkins / Alice Valentini / Sara Marsango / Katrine Schultz-Knudsen / Trond Ulven / Elisabeth Rexen Ulven / Irina G Tikhonova / Graeme Milligan / Cheng Zhang / ![]() ![]() ![]() Abstract: Free fatty acid receptor 2 (FFA2) is a G protein-coupled receptor (GPCR) that is a primary sensor for short-chain fatty acids produced by gut microbiota. Consequently, FFA2 is a promising drug ...Free fatty acid receptor 2 (FFA2) is a G protein-coupled receptor (GPCR) that is a primary sensor for short-chain fatty acids produced by gut microbiota. Consequently, FFA2 is a promising drug target for immunometabolic disorders. Here we report cryogenic electronic microscopy structures of FFA2 in complex with two G proteins and three distinct classes of positive allosteric modulators (PAMs), and describe noncanonical activation mechanisms that involve conserved structural features of class A GPCRs. Two PAMs disrupt the E/DRY activation microswitch and stabilize the conformation of intracellular loop 2 by binding to lipid-facing pockets near the cytoplasmic side of the receptor. By contrast, the third PAM promotes the separation of transmembrane helices 6 and 7 by interacting with transmembrane helix 6 at the receptor-lipid interface. Molecular dynamic simulations and mutagenesis experiments confirm these noncanonical activation mechanisms. Furthermore, we demonstrate the molecular basis for the G versus G bias, which is due to distinct conformations of intracellular loop 2 stabilized by different PAMs. These findings provide a framework for the design of tailored GPCR modulators, with implications that extend beyond FFA2 to the broader field of GPCR drug discovery. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 59.4 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 23 KB 23 KB | Display Display | ![]() |
Images | ![]() | 93.9 KB | ||
Filedesc metadata | ![]() | 7.3 KB | ||
Others | ![]() ![]() | 59.1 MB 59.1 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 844.1 KB | Display | ![]() |
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Full document | ![]() | 843.7 KB | Display | |
Data in XML | ![]() | 10.9 KB | Display | |
Data in CIF | ![]() | 12.3 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 9clwMC ![]() 9cm3C ![]() 9cm7C ![]() 9ns9C M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | FFA2-TUG1375-4CMTB_half_A | ||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. generated in cubic-lattice coordinate | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.828 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: FFA2-TUG1375-4CMTB half A
File | emd_45732_half_map_1.map | ||||||||||||
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Annotation | FFA2-TUG1375-4CMTB_half_A | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: FFA2-TUG1375-4CMTB half B
File | emd_45732_half_map_2.map | ||||||||||||
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Annotation | FFA2-TUG1375-4CMTB_half_B | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
+Entire : TUG-1375-4-CMTB-FFA2-miniGq complex
+Supramolecule #1: TUG-1375-4-CMTB-FFA2-miniGq complex
+Macromolecule #1: Guanine nucleotide-binding protein G(q) subunit alpha
+Macromolecule #2: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
+Macromolecule #3: scFv16
+Macromolecule #4: Free fatty acid receptor 2
+Macromolecule #5: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
+Macromolecule #6: (2R,4R)-2-(2-chlorophenyl)-3-[4-(3,5-dimethyl-1,2-oxazol-4-yl)phe...
+Macromolecule #7: (2~{S})-2-(4-chlorophenyl)-3-methyl-~{N}-(1,3-thiazol-2-yl)butanamide
+Macromolecule #8: CHOLESTEROL
+Macromolecule #9: PALMITIC ACID
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | TFS KRIOS |
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Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 55.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.8 µm / Nominal defocus min: 1.0 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |