过渡性域间相互作用调节亨廷外子1的单体结构组合和自我组合
Priyesh Mohanty1, Tien Minh Phan1, Jeetain Mittal1,2,3
1Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX, 77843, USA.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|April 28, 2025
概括
亨廷顿氏病与亨廷廷素外子-1中扩大的多重胺 (polyQ) 管道有关. 分子动力学揭示了多Q扩张如何驱动结构变化和域相互作用,导致蛋白质聚合.
科学领域:
- 神经科学是一个神经科学.
- 生物化学 生化学
- 计算生物学 计算生物学
背景情况:
- 亨廷顿氏病 (HD) 是一种神经退行性疾病,是由亨廷丁外子-1 (Httex1) 中扩展的多重胺 (polyQ) 管道引起的.
- Httex1的N端N17域促进可溶性寡合体的形成,但聚合的机制尚不清楚.
- 了解Httex1聚合对于开发HD治疗方法至关重要.
研究的目的:
- 为了阐明由多Q扩张驱动的Httex1聚合的分子机制.
- 研究Httex1寡合化中的结构转换和域交叉交谈之间的相互作用.
- 描述N17和富含proline的域 (PRD) 在Httex1形状变化中的作用.
主要方法:
- 广泛的原子分子动力学 (MD) 模拟 (总时间约0.7毫秒).
- 对核磁共振 (NMR) 数据进行MD衍生组合的验证.
- 对Httex1单体和二元体的域间相互作用和构造组合的分析.
主要成果:
- 聚Q扩张增加了α-helicity,并有利于短暂的域间 (N17/polyQ) 相互作用,促进β-sheet形成.
- 域间相互作用调节N17介导的二元体的稳定性,导致异质的二元化场景.
- 富含プロ林的域 (PRD) 通过自我相互作用促进Httex1的凝结,并抑制N17α-helicity.
结论:
- 在Httex1中,PolyQ扩张诱导了结构变化和域交叉交谈,推动了从可溶性寡合物向不溶性聚合物的过渡.
- N17和PRD域在调节Httex1的构造,二元化和聚合倾向方面发挥着至关重要的作用.
- 这些发现提供了对亨廷顿病病原体和潜在治疗点的分子见解.
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