一个核糖核酶在RNAi过程中协调siRNA放大和mRNA分裂
Hsin-Yue Tsai1, Chun-Chieh G Chen2, Darryl Conte2
1RNA Therapeutics Institute, University of Massachusetts Medical School, Worcester, MA 01605, USA; Institute of Biological Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan.
Cell
|January 31, 2015
概括
在C. elegans中,RNA干扰 (RNAi) 沉默依赖于RDE-8,这是一个分裂目标信使RNA (mRNA) 的酶. 此外,RDE-8还促进了小干扰RNAs (siRNAs) 的放大,以实现强大的基因沉默.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 在RNA生物学,RNA生物学.
背景情况:
- RNA干扰 (RNAi) 是一种基因沉默机制.
- 信号放大对于有效的RNAi至关重要.
- 阿尔戈纳特蛋白质是RNAi的关键参与者,通常被认为直接切割目标.
研究的目的:
- 研究在C. elegans中RNAi沉默的机制.
- 为了确定阿尔戈诺特蛋白RDE-1在沉默中的作用.
- 为了确定负责向RNA降解和信号放大的酶活性.
主要方法:
- 生物化学测试来测试RNA裂变活性.
- 在体内对C. elegans进行研究,以评估基因沉默和RNA修饰.
- 对阿尔戈诺特蛋白招募和对RNA依赖RNA聚合酶 (RdRP) 下游影响的分析.
主要成果:
- 在C. elegans. 中,RDE-1的酶活性对于沉默并不重要.
- RDE-1 招募了内啡核糖酶 RDE-8 来准RNA.
- RDE-8分裂目标mRNA并产生3'uridylated片段,促进RdRP活动和siRNA放大.
结论:
- RDE-8 是关键的酶介导目标mRNA裂变的RNAi沉默在C. elegans. 中的关键酶.
- RDE-8生成3'尿化碎片,作为RdRP介导的沉默信号放大模板.
- 这种机制突出了RNAi信号传播的新途径,涉及Endoribonuclease招募和uridylatedRNA中间体.
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