对RNA干扰分子机制的三维视图
Martin Jinek1, Jennifer A Doudna
1Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA.
Nature
|January 23, 2009
概括
小RNAs通过Dicer和Argonaute蛋白调节真核生物中的基因表达. 结构洞察力揭示了RNA沉默的机制,这对细胞过程和基因组防御至关重要.
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:
- 小型非编码RNA是真核生物中基因表达的重要调节者.
- 这些RNAs控制细胞代谢,生长,分化,基因组完整性,以及对病毒和移动元素的防御.
- 专门的核糖核酶,Dicer和Argonaute蛋白质,是小RNA通路中的关键参与者.
研究的目的:
- 为了阐明RNA沉默通路背后的分子机制.
- 了解Dicer和Argonaute蛋白在小RNA生物发生和功能中的作用.
- 提供对Dicer和Argonaute蛋白质的结构见解,它们既自由又与小RNA结合.
主要方法:
- 对Dicer和Argonaute蛋白质的分子结构进行分析.
- 在自由和小RNA结合状态下对蛋白质的研究.
- 对RNA沉默通路的生物化学和遗传研究.
主要成果:
- 迪克将双链RNA前体切割成小干扰RNA和微RNA.
- 阿尔戈纳特蛋白质结合小RNA并指导特定序列的信使RNA沉默.
- 沉默是通过mRNA裂变或翻译抑制发生的.
- 结构数据为RNA沉默的分子基础提供了洞察力.
结论:
- 迪克和阿尔戈诺特蛋白质是真核细胞中小RNAs基因调节的核心.
- 这些蛋白质的结构研究提供了对RNA沉默机制的批判性理解.
- 这些通路对于维持细胞平衡和基因组防御至关重要.
相关概念视频
01:23RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
01:23RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
02:15Experimental RNAi
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
02:30siRNA - Small Interfering RNAs
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
01:20Types of RNA
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
RNA Performs Diverse...
01:23Types of RNA
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...