由α-Synuclein Amyloids进行的ATP水解通过封闭β-链介导
Lukas Frey1, Fiamma Ayelen Buratti2, Istvan Horvath2
1ETH Zürich, Institute of Molecular Physical Science, Zürich, 8092, Switzerland.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 16, 2025
概括
病理性粉样蛋白,特别是涉及帕金森病的α-synuclein粉样蛋白,可以化学分解腺三酸盐 (ATP). 这一发现揭示了神经退行性疾病中粉样蛋白功能障碍的新机制.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 神经科学是一个神经科学.
背景情况:
- 病理性粉样蛋白,如帕金森病中的α-synuclein聚合物,表现出催化活性.
- 腺三酸盐 (ATP) 是细胞中的主要能量货币.
研究的目的:
- 调查alpha-synuclein amyloids是否可以催化ATP的水解. 为了研究alpha-synuclein amyloids是否可以催化ATP的水解.
- 为了阐明这种粉样蛋白催化作用的基础结构机制.
主要方法:
- 高分辨率冷电子显微镜 (cryo-EM) 用于确定使用ATP的α-synuclein粉样蛋白的结构.
- 参与ATP结合和催化过程的关键残留物的位点定向突变发生.
- 生化分析测量ATPase活动.
主要成果:
- 阿尔法-同核素粉样蛋白形成1A型折叠,附带额外的β链,形成一个包围ATP的腔.
- 在Lys21,Lys23,Lys43,Lys45和Lys60残留物中的突变显著降低了ATP水解.
- 将Lys21转变为Ala改变了ATP结合的方向,并取消了额外的β链.
结论:
- 带正电荷的残留物和一个有序的N端β链形成一个空腔对于α-synuclein粉样蛋白催化ATP水解至关重要.
- 这种粉样蛋白催化ATP水解可能会损害细胞ATP依赖的过程在体内粉样蛋白沉积物附近.
- 这些发现为帕金森病的病原性机制提供了新的见解.
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