酵母阿尔戈诺特的结构与指导RNA
Kotaro Nakanishi1, David E Weinberg, David P Bartel
1Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10065, USA.
Nature
|June 23, 2012
概括
克鲁伊维罗米切斯多利斯波鲁斯阿尔戈纳特 (KpAGO) 的晶体结构揭示了导向RNA是如何加载和定位的. 这种结构阐明了阿尔戈纳特介导的RNA裂变机制,这对于RNA干扰至关重要.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- RNA诱导的沉默复合体 (RISC) 是RNA干扰 (RNAi) 的核心.
- 阿尔戈纳特蛋白质是RISC的关键组成部分,结合导向RNA以调解目标识别和分裂.
- 了解阿尔戈纳特人的结构和功能对于破译基因调节和开发基于RNAi的治疗方法至关重要.
研究的目的:
- 确定与指导RNA复合的Kluyveromyces polysporus Argonaute (KpAGO) 的晶体结构.
- 为了阐明指导RNA加载和定位在Argonaute中的结构基础.
- 确定负责阿尔戈诺特在RNA裂变中的催化活性的结构特征.
主要方法:
- 进行X射线晶体学,以获得KpAGO导向RNA复合物的3.2 Å结构.
- 现场定向突变发生,以调查特定残留物和结构元素的作用.
- 生物化学测试,包括RNA裂变测试,以评估阿尔戈诺特活动.
主要成果:
- 晶体结构揭示了由重组KpAGO.自主加载的导向RNA.
- 导向RNA核酸1-8采用一种保存的,接近A形的形状,独立于序列.
- KpAGO拥有独特的插入分段,可以重新定位N域,从而促进引导-目标配对.
- 通过稳定循环插入保存的谷氨酸残留物,形成催化口袋的一部分,完成保存的催化四位数.
结论:
- KpAGO结构为指导RNA结合和定位提供了前所未有的洞察力.
- 在KpAGO中的结构性适应,包括插入段和谷氨酸指,对于RNA裂变激活至关重要.
- 这项工作阐明了阿尔戈纳特介导的RNA干扰的机制,并为理解相关的生物过程提供了基础.
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There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
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The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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