一个 prokaryotic Argonaute 的 DNA 指导的 DNA 干扰
Daan C Swarts1, Matthijs M Jore1, Edze R Westra1
1Laboratory of Microbiology, Department of Agrotechnology and Food Sciences, Wageningen University, Dreijenplein 10, 6703 HB Wageningen, the Netherlands.
Nature
|February 18, 2014
概括
Prokaryotic Argonaute (Ago) 蛋白质,如Thermus thermophilus Ago (TtAgo),可以抵抗外来DNA. TtAgo使用小型DNA指南来准和切割互补DNA,作为DNA指导的DNA干扰系统.
科学领域:
- 分子生物学分子生物学
- 微生物学 微生物学
- 遗传学 是一个遗传学.
背景情况:
- RNA干扰 (RNAi) 是一种保存的真核细胞过程,利用小RNA分子引导阿尔戈诺特 (Ago) 蛋白质进行基因调节和防御.
- 尽管预测它们在宿主防御中的作用,但 prokaryotic Ago 同类的功能仍然在很大程度上未被描述.
- 生物信息分析表明, prokaryotic Ago 蛋白质可能参与宿主防御机制.
研究的目的:
- 研究来自细菌Thermus thermophilus (TtAgo) 的阿尔戈诺特蛋白的功能作用.
- 阐明TtAgo调解 prokaryotes 中宿主防御的机制.
- 为了确定TtAgo是否使用RNA或DNA指南进行目标识别和切割.
主要方法:
- 在Thermus thermophilus中的TtAgo活性体内表征.
- 对与TtAgo.go相关的小核酸指南的分析.
- 生物化学测试以确定通过TtAgo-guide复合体的DNA点裂变.
主要成果:
- TtAgo装载有5'-酸化DNA导体,长度为13-25个核酸.
- 这些DNA指南对5'-end脱氧化胺具有强烈的偏见,并且通常是等离子体衍生的.
- 在这些小DNA的指导下,TtAgo有效地切割互补的DNA链,证明了DNA指导的DNA干扰.
结论:
- 来自Thermus thermophilus (TtAgo) 的阿尔戈诺特蛋白质作为DNA引导的DNA干扰系统起作用.
- 在 prokaryotes 中,TtAgo 作为阻碍外来 DNA 的吸收和传播的障碍.
- 尽管与真核RNA干扰机器具有结构上的相似之处,但TtAgo采用DNA指南来进行DNA割,突出显示出一种独特的原生细胞防御策略.
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