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-Structure paper
| タイトル | Allosteric modulation and biased signalling at free fatty acid receptor 2. |
|---|---|
| ジャーナル・号・ページ | Nature, Vol. 643, Issue 8074, Page 1428-1438, Year 2025 |
| 掲載日 | 2025年6月18日 |
著者 | 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 / ![]() |
| PubMed 要旨 | 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. |
リンク | Nature / PubMed:40533560 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.06 - 3.3 Å |
| 構造データ | EMDB-45732, PDB-9clw: EMDB-45738, PDB-9cm3: EMDB-45743, PDB-9cm7: EMDB-49745, PDB-9ns9: |
| 化合物 | ![]() ChemComp-9UJ: ![]() PDB-1lyc: ![]() ChemComp-CLR: ![]() ChemComp-PLM: ![]() PDB-1azc: ![]() PDB-1azb: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / GPCR / agonist |
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