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-Structure paper
タイトル | Constitutive activation mechanism of a class C GPCR. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 31, Issue 4, Page 678-687, Year 2024 |
掲載日 | 2024年2月8日 |
著者 | Jinwoo Shin / Junhyeon Park / Jieun Jeong / Jordy Homing Lam / Xingyu Qiu / Di Wu / Kuglae Kim / Joo-Youn Lee / Carol V Robinson / Jaekyung Hyun / Vsevolod Katritch / Kwang Pyo Kim / Yunje Cho / |
PubMed 要旨 | Class C G-protein-coupled receptors (GPCRs) are activated through binding of agonists to the large extracellular domain (ECD) followed by rearrangement of the transmembrane domains (TMDs). GPR156, a ...Class C G-protein-coupled receptors (GPCRs) are activated through binding of agonists to the large extracellular domain (ECD) followed by rearrangement of the transmembrane domains (TMDs). GPR156, a class C orphan GPCR, is unique because it lacks an ECD and exhibits constitutive activity. Impaired GPR156-G signaling contributes to loss of hearing. Here we present the cryo-electron microscopy structures of human GPR156 in the G-free and G-coupled states. We found that an endogenous phospholipid molecule is located within each TMD of the GPR156 dimer. Asymmetric binding of Gα to the phospholipid-bound GPR156 dimer restructures the first and second intracellular loops and the carboxy-terminal part of the elongated transmembrane 7 (TM7) without altering dimer conformation. Our findings reveal that GPR156 is a transducer for phospholipid signaling. Constant binding of abundant phospholipid molecules and the G-protein-induced reshaping of the cytoplasmic face provide a basis for the constitutive activation of GPR156. |
リンク | Nat Struct Mol Biol / PubMed:38332368 |
手法 | EM (単粒子) |
解像度 | 2.61 - 3.33 Å |
構造データ | EMDB-35377, PDB-8ieb: EMDB-35378, PDB-8iec: EMDB-35380, PDB-8ied: EMDB-35382, PDB-8iei: EMDB-35389, PDB-8iep: EMDB-35390, PDB-8ieq: |
化合物 | PDB-1lya: |
由来 |
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キーワード | SIGNALING PROTEIN / Membrane protein / G-protein coupled receptor / Signal transduction / Phospholipid |