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用冷-ET,冷-EM和AFM成像的状和环状基体

Ruina Liang¹, Anum Khursheed¹, Bogachan Tahirbegi¹

¹Department of Biochemistry, School of Biological and Behavioural Sciences, Queen Mary University of London, London, UK.

Science advances

|August 27, 2025

概括

在阿尔茨海默氏症中,β-粉样蛋白 (Aβ) 寡合体形成有毒的前纤维结构. 新的成像显示这些Aβ组件的直径为2.8纳米,并形成能够穿越细胞膜的通道.

科学领域:

生物化学
神经科学
结构生物学

背景情况:

前纤维性粉样β (Aβ) 寡合体与阿尔茨海默病的发病有关.
了解Aβ寡合体形成和细胞毒性的结构基础至关重要.

研究的目的:

使用先进的成像技术来描述前纤维状Aβ组件的结构.
阐明Aβ纤维素形成的机制和寡合结构的作用.

主要方法:

低温电子断层扫描 (低温ET) 和低温电子显微镜 (低温EM) 单颗粒分析.
在现场原子力显微镜 (AFM) 用于实时成像.
补丁电生理学评估膜通道活动.

主要成果:

具有一致的2.8nm直径的曲线原纤维和寡合体.
AFM证实了球形寡合体的模板扩展到原纤维.
识别的环形Aβ组件具有1.4nm通道,能够穿过膜.
电生理学数据与观察到的通道直径相关.

结论:

Aβ寡合体扩展到曲线原纤维,可能通过横向关联启动纤维形成.
环状Aβ组件形成膜跨度通道,提供Aβ诱导的神经毒性的潜在机制.
对Aβ组装动态的结构洞察力为阿尔茨海默病的治疗策略提供了目标.

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