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与核RNA相关的过程调节了细胞质RNA颗粒的组装
Mor Angel1, Eden Fleshler1, Mohammad Khaled Atrash1
1The Mina & Everard Goodman Faculty of Life Sciences and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan 5290002, Israel.
Nucleic acids research
|February 17, 2024
概括
细胞质中的新转录的信使RNA (mRNA) 对于压力颗粒 (SG) 组装至关重要. 抑制mRNA处理会影响SG形成并改变P体动态,突出显示核mRNA事件与细胞质应激反应之间的联系.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 压力颗粒 (SGs) 是在细胞应激过程中形成的动态细胞质焦点.
- SGs封存未翻译的mRNA和蛋白质,主要是由于翻译停止.
- 核mRNA处理在SG组装中的确切作用仍然不清楚.
研究的目的:
- 研究抑制mRNA转录,拼接和出口对SG形成的影响.
- 探索核mRNA代谢和细胞质SG组合之间的关系.
- 阐明细胞质mRNA水平对SG生物发生的贡献.
主要方法:
- 在真核细胞中抑制mRNA转录,拼接和输出.
- 应力颗粒和P体的形成和动态的分析.
- 将合成mRNA添加到细胞质提取物中.
- 评估与压力相关的蛋白质合成途径.
主要成果:
- 抑制mRNA转录,拼接和出口减少了正规的SG形成.
- 在抑制mRNA处理时观察到改变的P体大小和数量.
- 拼接抑制剂马德拉辛诱导了类似压力颗粒组装.
- 合成mRNA的直接细胞质添加触发了SG组装,这取决于与压力相关的途径.
- 细胞质mRNA水平的增加在压力下促进了SG的形成,即使没有活跃的拼接.
结论:
- 细胞质mRNA的丰富性,特别是新转录的分子,是SG组装的关键驱动因素.
- 核mRNA处理事件与细胞质SG形成有关.
- 涉及SG的细胞应激反应对细胞质mRNAs的可用性敏感.
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