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-Structure paper
| タイトル | Shape-shifting conotoxins reveal divergent pore-targeting mechanisms in nicotinic receptors. |
|---|---|
| ジャーナル・号・ページ | Structure, Year 2025 |
| 掲載日 | 2025年12月29日 |
著者 | Biddut Bhattacharjee / Colleen M Noviello / Md Mahfuzur Rahman / John P Mayer / Joanna Gajewiak / J Michael McIntosh / Ryan E Hibbs / Michael H B Stowell / ![]() |
| PubMed 要旨 | The neuronal α7 nicotinic acetylcholine receptor (α7-nAChR) and muscle-type nicotinic acetylcholine receptor (mt-nAChR) are pivotal in synaptic signaling within the brain and the neuromuscular ...The neuronal α7 nicotinic acetylcholine receptor (α7-nAChR) and muscle-type nicotinic acetylcholine receptor (mt-nAChR) are pivotal in synaptic signaling within the brain and the neuromuscular junction respectively. Additionally, they are both targets of a wide range of drugs and toxins. Here, we utilize cryo-EM to delineate structures of these nAChRs in complex with the conotoxins ImI and ImII from Conus imperialis. Despite nominal sequence differences, ImI and ImII exhibit discrete binding preferences and adopt drastically different conformational states upon binding. ImI engages the orthosteric sites of α7-nAChR, while ImII forms distinct pore-bound complexes with both α7-nAChR and mt-nAChR. Strikingly, ImII adopts a compact globular conformation that binds as a monomer to the α7-nAChR pore and as an oblate dimer to the mt-nAChR pore. These structures advance our understanding of nAChR-ligand interactions and the subtle sequence variations that result in dramatically altered functional outcomes in small peptide toxins. |
リンク | Structure / PubMed:41468893 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.96 - 3.1 Å |
| 構造データ | EMDB-49897, PDB-9nx0: EMDB-49898, PDB-9nx1: EMDB-49899, PDB-9nx2: |
| 化合物 | ![]() ChemComp-NAG: ![]() ChemComp-POV: ![]() ChemComp-EPJ: ![]() ChemComp-CCE: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / ion channel / toxin |
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homo sapiens (ヒト)
conus imperialis (ミカドミナシ)
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