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-Structure paper
タイトル | Mechanism of receptor assembly via the pleiotropic adipokine Leptin. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 30, Issue 4, Page 551-563, Year 2023 |
掲載日 | 2023年3月23日 |
著者 | Alexandra Tsirigotaki / Ann Dansercoer / Koen H G Verschueren / Iva Marković / Christoph Pollmann / Maximillian Hafer / Jan Felix / Catherine Birck / Wouter Van Putte / Dominiek Catteeuw / Jan Tavernier / J Fernando Bazan / Jacob Piehler / Savvas N Savvides / Kenneth Verstraete / |
PubMed 要旨 | The adipokine Leptin activates its receptor LEP-R in the hypothalamus to regulate body weight and exerts additional pleiotropic functions in immunity, fertility and cancer. However, the structure and ...The adipokine Leptin activates its receptor LEP-R in the hypothalamus to regulate body weight and exerts additional pleiotropic functions in immunity, fertility and cancer. However, the structure and mechanism of Leptin-mediated LEP-R assemblies has remained unclear. Intriguingly, the signaling-competent isoform of LEP-R is only lowly abundant amid several inactive short LEP-R isoforms contributing to a mechanistic conundrum. Here we show by X-ray crystallography and cryo-EM that, in contrast to long-standing paradigms, Leptin induces type I cytokine receptor assemblies featuring 3:3 stoichiometry and demonstrate such Leptin-induced trimerization of LEP-R on living cells via single-molecule microscopy. In mediating these assemblies, Leptin undergoes drastic restructuring that activates its site III for binding to the Ig domain of an adjacent LEP-R. These interactions are abolished by mutations linked to obesity. Collectively, our study provides the structural and mechanistic framework for how evolutionarily conserved Leptin:LEP-R assemblies with 3:3 stoichiometry can engage distinct LEP-R isoforms to achieve signaling. |
リンク | Nat Struct Mol Biol / PubMed:36959263 |
手法 | EM (単粒子) / X線回折 |
解像度 | 1.75 - 6.84 Å |
構造データ | EMDB-15677: Cryo-EM structure for mouse leptin in complex with the mouse LEP-R ectodomain (1:2 mLEP:mLEPR model) EMDB-15678, PDB-8avc: EMDB-15679, PDB-8avd: EMDB-15680, PDB-8ave: EMDB-15681, PDB-8avf: EMDB-15683, PDB-8avo: EMDB-15899, PDB-8b7q: PDB-7z3p: PDB-7z3q: PDB-7z3r: PDB-8av2: |
化合物 | ChemComp-CA: ChemComp-PEG: ChemComp-HOH: ChemComp-NAG: ChemComp-SO4: ChemComp-NI: |
由来 |
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キーワード | CYTOKINE / leptin / obesity / leptin receptor / LepR / adipose tissue / hypothalamus / immune system / LEP-R / metabolism / energy balance |