ADAR1与Dicer形成一个复合体,以促进微RNA处理和RNA诱导的基因沉默
Hiromitsu Ota1, Masayuki Sakurai, Ravi Gupta
1The Wistar Institute, Philadelphia, PA 19104, USA.
Cell
|April 30, 2013
概括
作用于RNA 1 (ADAR1) 的腺胺酶与Dicer相互作用,增强微RNA (miRNA) 处理和RNA干扰 (RNAi) 途径. 这种相互作用对miRNA生物发生和基因调节至关重要,影响胚胎发育.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- 作用于RNA的腺氨酸脱氨酶 (ADARs) 催化RNA编辑,在双链RNA中将腺素转化为 inosine.
- RNA干扰 (RNAi) 是一种关键的基因调节途径,涉及微RNA (miRNA) 等小RNA.
研究的目的:
- 研究RNA编辑机器 (ADARs) 和RNA干扰机器 (RNAi) 之间的相互作用.
- 阐明ADAR1在miRNA生物发生中的特定作用及其与Dicer的相互作用.
主要方法:
- 蛋白质与蛋白质相互作用的研究,以确定ADAR1和Dicer之间的复杂形成.
- 生物化学试验测量Dicer在ADAR1.1存在时的miRNA分离前活性 (Vmax).
- 在ADAR1淘汰赛小鼠胚胎中分析miRNA表达和目标基因调节.
主要成果:
- ADAR1与Dicer.形成一个直接的蛋白质-蛋白质复合体.
- ADAR1显著增加了Dicer.的前-miRNA裂变的Vmax.
- ADAR1促进成熟的miRNA加载到RNA诱导的沉默复合体 (RISCs).
- ADAR1通过同位体和异位体复合体的形成来区分其RNA编辑和RNAi功能.
- 全球miRNA表达被抑制在ADAR1(-/-) 小鼠胚胎中,导致目标基因表达的改变和胚胎致死性.
结论:
- 在miRNA处理和RNAi途径中,ADAR1在RNA编辑中的已知功能之外,起着新的,关键的作用.
- ADAR1和Dicer之间的相互作用对于有效的miRNA生物发生和随后的基因沉默至关重要.
- ADAR1的失调会影响miRNA路径,导致发育缺陷,如胚胎死亡率.
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