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-Structure paper
| タイトル | Structural insights into small-molecule agonist recognition and activation of complement receptor C3aR. |
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| ジャーナル・号・ページ | EMBO J, Vol. 44, Issue 10, Page 2803-2826, Year 2025 |
| 掲載日 | 2025年4月7日 |
著者 | Jinuk Kim / Saebom Ko / Chulwon Choi / Jungnam Bae / Hyeonsung Byeon / Chaok Seok / Hee-Jung Choi / ![]() |
| PubMed 要旨 | The complement system plays crucial roles in innate immunity and inflammatory responses. The anaphylatoxin C3a mediates pro-inflammatory and chemotactic functions through the G protein-coupled ...The complement system plays crucial roles in innate immunity and inflammatory responses. The anaphylatoxin C3a mediates pro-inflammatory and chemotactic functions through the G protein-coupled receptor C3aR. While the active structure of the C3a-C3aR-G complex has been determined, the inactive conformation and activation mechanism of C3aR remain elusive. Here we report the cryo-EM structure of ligand-free, G protein-free C3aR, providing insights into its inactive conformation. In addition, we determine the structures of C3aR in complex with the synthetic small-molecule agonist JR14a in two distinct conformational states: a G protein-free intermediate, and a fully active G-bound state. The structure of the active JR14a-bound C3aR reveals that JR14a engages in highly conserved interactions with C3aR, similar to the binding of the C-terminal pentapeptide of C3a, along with JR14a-specific interactions. Structural comparison of C3aR in the apo, intermediate, and fully active states provides novel insights into the conformational landscape and activation mechanism of C3aR and defines a molecular basis explaining its high basal activity. Our results may aid in the rational design of therapeutics targeting complement-related inflammatory disorders. |
リンク | EMBO J / PubMed:40195498 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.42 - 3.56 Å |
| 構造データ | EMDB-60782, PDB-9ipv: ![]() EMDB-60783: Focused refinement map of Galpha(i) in JR14A-C3aR-Gi-scFv16 complex ![]() EMDB-60784: Focused refinement map of C3aR in JR14A-C3aR-Gi-scFv16 complex EMDB-60785, PDB-9ipy: EMDB-60836, PDB-9isi: |
| 化合物 | ![]() PDB-1d9a: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / GPCR |
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