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-Structure paper
タイトル | Decoding the structural basis of ligand recognition and biased signaling in the motilin receptor. |
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ジャーナル・号・ページ | Cell Rep, Vol. 44, Issue 3, Page 115329, Year 2025 |
掲載日 | 2025年3月25日 |
![]() | Chongzhao You / Mengting Jiang / Tianyu Gao / Zining Zhu / Xinheng He / Youwei Xu / Yuan Gao / Yi Jiang / H Eric Xu / ![]() |
PubMed 要旨 | The motilin receptor (MTLR) is a key target for treating gastrointestinal (GI) disorders like gastroparesis, yet developing effective agonists remains challenging due to drug tolerance and signaling ...The motilin receptor (MTLR) is a key target for treating gastrointestinal (GI) disorders like gastroparesis, yet developing effective agonists remains challenging due to drug tolerance and signaling bias. We present cryoelectron microscopy (cryo-EM) structures of MTLR bound to azithromycin, a macrolide antibiotic, and DS-3801b, a non-macrolide agonist. Distinct ligand recognition mechanisms are revealed, with azithromycin binding deeply within the orthosteric pocket and DS-3801b adopting a special clamp-like conformation stabilized by a water molecule. We also highlight the critical role of extracellular loop 2 (ECL2) in ligand specificity and signaling pathway activation, affecting both G-protein and β-arrestin signaling. Additionally, the "DRS" motif and interactions around transmembranes 6/7 (TM6/7) are identified as key drivers of signaling selectivity. These findings offer insights into the structural dynamics of MTLR, laying the groundwork for the rational design of next-generation GI prokinetic drugs with enhanced efficacy and safety. |
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手法 | EM (単粒子) |
解像度 | 2.57 - 2.74 Å |
構造データ | EMDB-61597, PDB-9jmc: EMDB-61598, PDB-9jmd: |
化合物 | ![]() ChemComp-CLR: ![]() PDB-1l4h: ![]() ChemComp-HOH: ![]() ChemComp-ZIT: |
由来 |
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![]() | SIGNALING PROTEIN / Cryo-EM / GPCR / Motilin receptor / DS-3801b / macrolide antibiotics / Gq / complex / Azithromycin |