在体外鉴定酵母DEAH/RHARNA螺旋酶Dhr1的特性
Ran Lin1, Ezzeddine Elmir2, Madison J Reynolds3
1Department of Molecular Biosciences, The University of Texas at Austin Austin, Texas, USA.
The Journal of biological chemistry
|March 2, 2025
概括
对于核糖体组装至关重要的 DEAH/RHA RNA 螺旋酶 Dhr1 被 Utp14 激活. Utp14结合Dhr1的表面域,而不是取代抑制环,促进U3snoRNA去除40S子单元成熟.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生化学
背景情况:
- 核糖核糖体生物发生涉及小子单元 (SSU) 过程体,这是40S子单元组装中的关键中间体.
- 在SSU过程中,U3的snoRNA和组装因子将核糖体RNA域分离到SSU过程中.
- 移除U3snoRNA对于形成中央伪结是必不可少的,对于40S子单元的结构和功能至关重要.
研究的目的:
- 为了进一步描述DEAH/RHA RNA螺旋酶Dhr1及其与SSU过程因子Utp14的相互作用.
- 为了阐明Utp14在核糖体生物发生过程中激活Dhr1的机制.
- 研究Dhr1的自身抑制区域以及Utp14如何克服这种抑制.
主要方法:
- 生物化学分析测量Dhr1的ATPase活性.
- 酵母遗传学在体内研究Dhr1和Utp14的功能.
- 位点定向的突变发生检测Dhr1的自身抑制区域和Utp14相互作用位点.
主要成果:
- Dhr1具有自抑制的N端和内部ReCa2域循环区域.
- Utp14激活了缺乏N端自抑制循环的Dhr1,但不是全长的Dhr1.
- Utp14可能通过与RecA1/RecA2域的表面结合来激活Dhr1,而不是通过移动自身抑制循环来激活Dhr1.
结论:
- Utp14通过与正规G补丁蛋白激活不同的机制激活Dhr1的ATPase活性.
- Utp14与Dhr1表面域的相互作用促进了U3snoRNA的移位,促进了40S前粒子的成熟.
- 这些发现为RNA酶的调节提供了新的见解,用于复杂的真核核糖核酶组装过程中.
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