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Rad23B通过异型缓冲延迟阿塔克辛-3从液态到固态相位的过渡

Archana Prasad¹, Sandhini Saha¹, Manisha Kumari¹

¹Laboratory of Functional Proteomics, Regional Centre for Biotechnology, NCR Biotech Science Cluster, Faridabad 121001, India.

Journal of molecular biology

|July 20, 2025

概括

与马查多-约瑟夫病相关的ATAXIN-3蛋白聚合,涉及液体-液体相分离和粉样蛋白形成. 与Rad23B蛋白的相互作用调节这些过程,影响细胞应激反应.

科学领域:

神经科学是一个神经科学.
生物化学生物化学
分子生物学分子生物学

背景情况:

在ATAXIN-3中异常的多重胺 (polyQ) 扩张会导致马查多-约瑟夫病,导致神经元核包容.
ATAXIN-3的聚合机制,包括粉样蛋白的形成和液体-液体相分离 (LLPS),尚未完全理解.
素-3最丰富的脑异型含有三种全域胺相互作用基因 (UIM).

研究的目的:

研究三个UIM Ataxin-3异型的LLPS特性.
澄清通过粉样蛋白和LLPS形成的阿辛-3聚合的分子机制.
检查Rad23B相互作用在Ataxin-3聚合和细胞应激反应中的作用.

主要方法:

在体外研究了阿塔克辛-3变体 (Q25,Q54,C端片段) 的LLPS.
使用生物物理技术评估滴滴衰老和粉样纤维的形成.
研究了ATAXIN-3和Rad23B之间的异型相互作用.
在化物暴露下,在压力颗粒中观察到阿-3的行为.

主要成果:

ATAXIN-3 Q25形成衰老的分相液滴,这些液滴成熟为粉样纤维.
扩展的polyQ (Q54) ATAXIN-3形成了短暂的滴状物,并迅速成熟.
ATAXIN-3的C端碎片形成了粉样纤维,具有较低的提奥夫拉-T结合.
在稀释条件下,Rad23B抑制了阿辛-3滴的成熟,但不能抑制粉样蛋白的形成.
在酸盐应力过程中,ataxin-3被纳入类似液体的应力颗粒.

结论:

通过错误折叠 (粉样路径) 的阿素-3聚合与其凝结路径 (LLPS) 截然不同.
在稀释条件下,Rad23B可调节ATAXIN-3LLPS,但不能调节其粉原性潜力.
ATAXIN-3的聚合动态和应激反应作用是通过其在应激颗粒中的行为来阐明的.

关键词:

ATAXIN-3的使用方法在Rad23B中,Rad23B是不同类型的缓冲.阶段分离的阶段分离.多QQ多QQ多QQ是什么意思

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