C9orf72聚PR直接与各种核运输部件结合
Hamidreza Jafarinia1, Erik van der Giessen1, Patrick R Onck1
1Zernike Institute for Advanced Materials, University of Groningen, Groningen, Netherlands.
eLife
|March 14, 2024
概括
富含氨酸的二聚重复蛋白 (R-DPR) 通过与关键运输蛋白结合,破坏C9orf72-ALS中的核运输. 这种分子相互作用解释了核细胞质运输 (NCT) 和C9orf72毒性的潜在缺陷.
科学领域:
- 分子生物学分子生物学
- 神经科学是一个神经科学.
- 生物物理学的生物物理.
背景情况:
- 核细胞质运输 (NCT) 干扰与神经退行性疾病 (如C9orf72-相关的肌肉缩小性侧面硬化症 (ALS)) 有关.
- 由C9orf72翻译的含有氨酸的二聚重复蛋白 (R-DPRs) 被假设通过与核运输受体结合来干扰NCT,例如Kapβ家族.
- 在R-DPR表达细胞中NCT损伤的确切分子机制尚不清楚.
研究的目的:
- 调查聚PR,有毒的R-DPR和各种核运输组件之间的直接分子相互作用.
- 阐明结合机制,并全面了解核细胞质运输 (NCT) 中可能存在的聚PR介导缺陷.
- 探索这些相互作用在C9orf72相关神经退行症的发病过程中的作用.
主要方法:
- 在氨基酸分辨率上使用粗粒度分子动力学模型.
- 模拟了聚PR与多个核运输因子之间的直接相互作用.
- 分析了结合点和对运输过程的潜在干扰.
主要成果:
- 发现PolyPR可以直接与Impα异型,CAS和RanGAP结合.
- 在polyPR和Ran.之间没有观察到结合.
- 在较低盐度下,较长的聚PR链也与RanGEF和NTF2.2相互作用.
- 分析揭示了RanGTP/RanGDP约束,货物-Impα相互作用和Impα核出口的潜在干扰.
结论:
- 聚烯直接与核孔综合体 (NPC) 运输机械的多个组件相互作用.
- 这些相互作用可能会破坏重要的NCT过程,包括货物绑定和释放以及核出口.
- 这些发现表明,与NCT的直接PolyPR干扰是导致神经退行性疾病中C9orf72毒性的合理机制.
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