核糖体RNA处理和监测的高分辨率景观
Weidong An1, Yunxiao Yan1,2, Keqiong Ye1,2
1Key Laboratory of RNA Science and Engineering, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.
Nucleic acids research
|July 12, 2024
概括
这项研究揭示了使用CircTA-seq.的酵母核糖体RNA处理的关键步骤. 我们详细介绍了5.8S rRNA形式的转化和Rex蛋白在25S rRNA成熟中的顺序作用.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学是一种遗传学.
- 生物化学 生物化学
背景情况:
- 核糖体RNA (rRNA) 处理对于核糖体生物生成至关重要.
- 了解rRNA处理途径对于细胞功能和疾病研究至关重要.
- 现有的方法在高分辨率下对rRNA加工中间体进行分析方面存在局限性.
研究的目的:
- 阐明酵母中rRNA处理和监测途径的机械细节.
- 以单分子和单核酸分辨率对rRNA加工中间体进行分析.
- 调查聚亚脱在rRNA降解中的作用.
主要方法:
- 使用了循环化,有针对性的放大和深度测序 (CircTA-seq).
- 对rRNA加工中间体的单分子和单核酸水平分析.
- 对前核糖体RNA (pre-rRNA) 多基解样的分析.
主要成果:
- 确定了一条统一的处理途径,将5.8SrRNA的5'末端的长形式转换为短形式.
- 在5.8S rRNA处理中,通过Rex1,Rex2和Trf4介导的多基化进行了序列修剪.
- 确定了四种雷克斯蛋白在25SrRNA的3'末端形成的顺序消化中的作用.
- 在异常的18S rRNA前体降解过程中观察到具有扩展A1位点的中间体.
- 证明了多基化长度对外体对20S前rRNA的降解效率产生了重大影响.
结论:
- CircTA-seq为酵母rRNA处理和监测提供了重要的机械洞察力.
- 5.8S和25S rRNAs的处理涉及协调的酶活动.
- 多基解在rRNA前中间体的降解中起着关键的调节作用.
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