C9orf72 聚PR 与核孔复合体的相互作用
Hamidreza Jafarinia1, Erik Van der Giessen1, Patrick R Onck1
1Zernike Institute for Advanced Materials, University of Groningen, Groningen, the Netherlands.
Biophysical journal
|August 29, 2024
概括
在ALS/FTD中有毒的聚烯-阿基因 (PR) 不会在核孔复合体 (NPC) 中聚合. 相反,PR通过NPC转移,转移难度随着PR长度的增加而增加.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- C9orf72基因突变是肌缩性侧面硬化/前性痴呆 (ALS/FTD) 的主要原因.
- 这种突变产生有毒的二重复蛋白质,包括涉及到细胞功能障碍的多--氨酸 (polyPR).
- 假设PolyPR通过干扰核孔综合体 (NPC) 来破坏核细胞质体运输 (NCT).
研究的目的:
- 研究聚PR与NPC相互作用的分子机制.
- 阐明聚PR如何影响核细胞质运输 (NCT).
- 了解NPC在聚PR介导细胞缺陷中的作用.
主要方法:
- 使用粗粒度的分子动力学模拟.
- 使用了polyPR和酵母NPC的模型,包括FG-核波林 (FG-Nups).
- 在NPC中分析了polyPR的相互作用和转位途径.
主要成果:
- 聚PR不会在NPC中聚合,也不会永久地与FG-Nups结合.
- 聚PR通过NPC的中部低密度区域转移.
- 转移面临更高的能源障碍和更长的聚PR链的更窄的道.
- 在polyPR和FG-Nups之间,绝缘相互作用占主导地位,其他力量的贡献较小.
结论:
- 聚PR穿过NPC,而不是在NPC中积累.
- 聚烯的尺寸会影响其转移效率和能源需求.
- 这些发现为ALS/FTD中聚PR诱导的NCT中断的分子基础提供了洞察力.
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