努普42保护热诱导的mRNA免受核凝结,以支持伴侣合成
bioRxiv : the preprint server for biology
|February 23, 2026
概括
处于热应激状态的细胞保护重要的伴侣mRNA免受凝结,确保蛋白质的产生. 核素Nup42是这个过程的关键,防止热敏性.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 压力反应应激反应
背景情况:
- 细胞通过改变基因表达来适应急性压力,抑制生长基因和调高压力适应性基因.
- 在热冲击期间,大多数现有的信使RNA (mRNA) 形成转化抑制的生物分子凝聚物.
- 热诱导的mRNAs避免凝结并保持翻译的机制仍然不太了解.
研究的目的:
- 为了研究特定的热诱导mRNA如何在热冲击期间逃避凝结.
- 在压力下识别控制mRNA凝聚和翻译能力的因素.
- 阐明核因子在调节细胞压力期间mRNA命运中的作用.
主要方法:
- 使用了一个全基因组CRISPR干扰 (CRISPRi) 选平台,分离报告员-Seq (FRep-Seq).
- 在野生类型和淘汰赛细胞中分析了热冲击期间的mRNA局部化和翻译.
- 研究了核蛋白Nup42对mRNA凝聚和基因表达的影响.
主要成果:
- 热诱导的伴侣mRNA被选择性地排除在凝结物之外,并优先转化,与核糖体蛋白编码mRNA不同.
- 核蛋白Nup42被确定为热引起的mRNA凝聚的关键抑制剂.
- 丢失Nup42导致伴侣mRNAs的核凝结,翻译受损,伴侣产量减少,热敏度增加.
- 同转录信使核糖蛋白 (mRNP) 包装显著影响Nup42缺乏细胞中的mRNA凝聚.
结论:
- 一个核,翻译独立的机制控制mRNP溶解度,对于热冲击基因表达至关重要.
- Nup42通过防止其凝结,在维持热诱导的mRNA的翻译能力方面发挥着至关重要的作用.
- 适当的mRNA包装和核出口对于细胞在急性压力期间的耐热性至关重要.
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