在促进异常拼接方面,Prp16的ATP独立作用
Che-Sheng Chung1, Hsu Lei Wai1, Ching-Yang Kao1
1Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan 115, Republic of China.
Nucleic acids research
|October 20, 2023
概括
拼接因子Prp16在RNA拼接中起着双重作用,有时促进,有时防止,使用不正确的拼接位. 它的功能取决于ATP和与其他拼接因子的相互作用,如Cwc25.
科学领域:
- 分子生物学分子生物学
- 在RNA分离过程中.
- 基因表达 基因表达
背景情况:
- 拼接体,一个复杂的分子机器,通过动态结合和释放组件在前mRNA上组装.
- 包括DExD/H盒蛋白在内的RNA螺旋酶对于拼接体重塑和拼接忠实性至关重要.
- Prp16是一种关键的RNA酶,传统上被视为拼接校对器.
研究的目的:
- 研究拼接因子Prp16在异常5'拼接位和分支点的利用中的作用.
- 阐明 Prp16 影响拼接精度的机制,特别是在突变或因子缺失的情况下.
- 确定 Prp16 在结合部位选择中是否表现出依赖ATP和/或独立活动.
主要方法:
- 通过使用野生型和突变的前mRNA,研究了Prp16在拼接反应中的功能.
- 评估Cwc24缺失对Prp16介导拼接的影响.
- 分析了Prp16的ATP依赖和独立活动.
- 检查了Prp16与Cwc25的相互作用及其在拼接部位选择中的作用.
主要成果:
- Prp16促进异常的5'拼接部位使用和突变的分支点利用,特别是当突变存在或Cwc24缺失时.
- Prp16促进异常拼接部位的使用可以独立于ATP发生.
- Prp16可以防止使用密码分支网站,同时促进突变的网站.
- 在剪接部位选择中的prp16的双重作用是由与剪接组件的稳定或不稳定相互作用介导的,涉及Cwc25.
结论:
- 在5'拼接位置和分支位置的选择中,prp16表现出取决于上下文的双重作用,同时作为一个增强器和阻碍错误站点使用的障碍.
- Prp16的功能通过ATP依赖性和ATP独立性活动进行介导.
- 一级因子Cwc25参与调解Prp16在拼接精度中的多种作用.
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