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对于应力颗粒和P体组件,需要tRNA合成酶活性
Max Baymiller1,2,3, Noah S Helton1,2, Benjamin Dodd1,2
1Department of Human Genetics, University of Michigan, Ann Arbor, Michigan 48109, USA.
Genes & development
|January 14, 2026
概括
阻断tRNA氨基化会导致持续的核糖体停滞,抑制RNP颗粒组装尽管集成应激反应 (ISR) 激活. 普罗米辛治疗释放了这些摊位,恢复了颗粒的形成,并突出了翻译质量控制.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 翻译延长缺陷触发了综合应激反应 (ISR).
- 清除核糖体停滞并释放mRNA用于核糖蛋白 (RNP) 颗粒组装的机制尚未完全理解.
- 核糖体停滞对RNP颗粒形成的影响,特别是应力颗粒和P体,需要进一步调查.
研究的目的:
- 为了研究在翻译延长应力过程中核糖体摊位是如何清除的.
- 确定核糖体阻滞在RNP颗粒组装中的作用,例如应力颗粒和P体.
- 阐明翻译延长,ISR和RNP颗粒动态之间的关系.
主要方法:
- 使用tRNA氨基化抑制剂和氨基酸剥夺来诱导翻译延长应激.
- 使用普罗米辛来评估持续性核糖体停滞的释放.
- 监测应力颗粒和P体组合,以应对诱导的机.
- 调查ZNF598依赖的核糖体关联质量控制在摊位清理中的作用.
主要成果:
- 由于阻断tRNA氨基化而引起的持久的非碰撞性核糖体停滞,抑制了压力颗粒和P体组装.
- 碰撞的核糖体通过ZNF598依赖的质量控制快速清除,而未碰撞的位持续超过16小时.
- 普罗米辛治疗有效地释放了持久的摊位,并挽救了RNP颗粒形成.
- 通过各种翻译延长抑制剂和氨基酸剥夺条件观察到RNP颗粒组装的抑制.
结论:
- 当翻译启动被抑制时,压力颗粒作为翻译延长状态的集成者.
- 翻译质量控制途径可以选择性清除碰撞的核糖体,但不能清除未碰撞的核糖体.
- 翻译延长应力可以将RNP颗粒组合与ISR脱.
- 耐受未碰撞的核糖体摊位可能是一个适应机制,对于必要的共同翻译过程.
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