Psr1酸酶通过拼接体B复合因子Snu66调节mRNA前拼接,通过拼接体B复合因子Snu66调节mRNA前拼接
Amjadudheen Varikkapulakkal1, Balashankar R Pillai1, Shravan Kumar Mishra1
1Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Mohali, India.
The FEBS journal
|November 1, 2024
概括
蛋白酸酶Psr1通过去酸化拼接因子Snu66来调节基因表达,从而影响mRNA前拼接. 这一发现揭示了PSR1在拼接过程中的新角色,超出了其已知的应激反应功能.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 前体信使RNA (pre-mRNA) 拼接是基因表达的关键过程,通过对拼接组分的修改来调节.
- 小核RNAs (snRNAs) 和 spliceosomal 蛋白质是拼接忠实性和替代拼接的关键调节者.
- 蛋白酸酶Psr1以前以其在Saccharomyces cerevisiae中的一般应激反应和血膜局部化中的作用而闻名.
研究的目的:
- 调查蛋白质酸酶Psr1在mRNA前拼接中的潜在调节作用.
- 为了确定PSR1是否与核心拼接因子相互作用和修改.
- 阐明PSR1影响拼接的机制,特别是涉及非正规拼接地点.
主要方法:
- 通过生物化学测试,研究了PSR1和拼接因子Snu66之间的相互作用.
- 在Snu66.6上评估了PSR1的脱化活性.
- 利用酵母删除突变体 (Psr1删除) 和催化不活跃突变体 (绑定突变体) 来研究拼接缺陷.
- 研究了Hub1对PSR1-Snu66相互作用的影响.
主要成果:
- Psr1结合并去化核心拼接因子Snu66,独立于其在等离子体膜中的定位.
- Psr1不是拼接体的一个组成部分.
- 删除Psr1或将催化突变物连接到Snu66导致拼接缺陷,特别是对于具有非正规5'拼接位的内子.
- 发现Hub1从Snu66中取代了PSR1,这表明了竞争性相互作用.
结论:
- 蛋白酸酶Psr1在mRNA前拼接中起着一种新的调节作用.
- 通过脱化,PSR1调节Snu66的功能,影响特定内子类型的拼接.
- Psr1,Snu66和Hub1之间的相互作用突出显示了spliceosome内部的一个复杂的调节网络.
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