ジャーナル: Commun Chem / 年: 2024 タイトル: Activity of botulinum neurotoxin X and its structure when shielded by a non-toxic non-hemagglutinin protein. 著者: Markel Martínez-Carranza / Jana Škerlová / Pyung-Gang Lee / Jie Zhang / Ajda Krč / Abhishek Sirohiwal / Dave Burgin / Mark Elliott / Jules Philippe / Sarah Donald / Fraser Hornby / Linda ...著者: Markel Martínez-Carranza / Jana Škerlová / Pyung-Gang Lee / Jie Zhang / Ajda Krč / Abhishek Sirohiwal / Dave Burgin / Mark Elliott / Jules Philippe / Sarah Donald / Fraser Hornby / Linda Henriksson / Geoffrey Masuyer / Ville R I Kaila / Matthew Beard / Min Dong / Pål Stenmark / 要旨: Botulinum neurotoxins (BoNTs) are the most potent toxins known and are used to treat an increasing number of medical disorders. All BoNTs are naturally co-expressed with a protective partner protein ...Botulinum neurotoxins (BoNTs) are the most potent toxins known and are used to treat an increasing number of medical disorders. All BoNTs are naturally co-expressed with a protective partner protein (NTNH) with which they form a 300 kDa complex, to resist acidic and proteolytic attack from the digestive tract. We have previously identified a new botulinum neurotoxin serotype, BoNT/X, that has unique and therapeutically attractive properties. We present the cryo-EM structure of the BoNT/X-NTNH/X complex and the crystal structure of the isolated NTNH protein. Unexpectedly, the BoNT/X complex is stable and protease-resistant at both neutral and acidic pH and disassembles only in alkaline conditions. Using the stabilizing effect of NTNH, we isolated BoNT/X and showed that it has very low potency both in vitro and in vivo. Given the high catalytic activity and translocation efficacy of BoNT/X, low activity of the full toxin is likely due to the receptor-binding domain, which presents very weak ganglioside binding and exposed hydrophobic surfaces.
温度: 294 K / 手法: 蒸気拡散法, シッティングドロップ法 / pH: 6.5 詳細: 15 mg/ml NTNH/X in 20 mM MES pH 5.5, 150 mM NaCl, 0.5 mM TCEP mixed in 2:1 volume ratio with 90 mM MES/imidazole pH 6.5, 9% (w/v) PEG 4,000, 18% (v/v) glycerol, and 3% (w/v) dextran sulfate sodium salt