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-Structure paper
| タイトル | A belt-buckle checkpoint regulates the onset of botulinum neurotoxin intoxication. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年6月23日 |
著者 | Baohua Chen / Linfeng Gao / Melvin Bönninger / Ting Huang / Nadja Krez / Weihua Wen / Mark Bowen / Jianlong Lou / James D Marks / Andreas Rummel / Rongsheng Jin / ![]() |
| PubMed 要旨 | Fast-acting botulinum neurotoxins (BoNTs) are highly desirable for both medical and aesthetic indications, but the underlying mechanism for the differing onset of BoNTs' action remains unknown. Here, ...Fast-acting botulinum neurotoxins (BoNTs) are highly desirable for both medical and aesthetic indications, but the underlying mechanism for the differing onset of BoNTs' action remains unknown. Here, we demonstrate that the "belt" of BoNTs, a largely unstructured loop wrapping around their catalytic light chain (LC), is key to onset of intoxication. The more flexible BoNT/E belt promotes quicker LC translocation into the neuronal cytosol, leading to faster onset of action compared to BoNT/A. Furthermore, we discover a "belt-buckle" checkpoint that regulates this process. By loosening the BoNT/A belt-buckle via protein engineering, we enhance its sensitivity to acidic pH, leading to an accelerated onset of action. Conversely, locking the belt-buckle with an antibody neutralizes BoNT/A. Our findings open avenues for developing fast-acting BoNTs and effective countermeasures. |
リンク | Nat Commun / PubMed:42337249 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.06 - 11.0 Å |
| 構造データ | EMDB-46409, PDB-9czb: EMDB-46410, PDB-9czc: ![]() EMDB-46800: CryoEM structure of BoNT/E at pH5, class 2 ![]() EMDB-46801: CryoEM structure of BoNT/E at pH5, class 3 ![]() EMDB-46802: CryoEM structure of BoNT/E at pH5, class 4 ![]() EMDB-46803: CryoEM structure of BoNT/E at pH5, class 5, BoNT/A-like EMDB-49339, PDB-9ney: ![]() EMDB-76739: The density map of BoNT/A mutant (BoNT/A-WFY) |
| 由来 |
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キーワード | TOXIN / Botulinum neurotoxin / IMMUNE SYSTEM/TOXIN / BoNT / antibody / IMMUNE SYSTEM-TOXIN complex |
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Clostridium botulinum E1 str. 'BoNT E Beluga' (ボツリヌス菌)
homo sapiens (ヒト)
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