RNAポリメラーゼの小さなRNA阻害体の合成媒介による放出
Karen M Wassarman1, Ruth M Saecker
1Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA. wassarman@bact.wisc.edu
Science (New York, N.Y.)
|December 13, 2006
まとめ
6SRNAは,RNAポリメラーゼの活性部位に結合することによって転写を抑制する. この相互作用は,RNA合成につながり,栄養素の利用可能性中に遺伝子発現のためのポリメラーゼを放出します.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子規制 遺伝子規制
- 微生物学 微生物学とは
背景:
- 非コーディング小RNAは,様々な生物の遺伝子発現を調節する.
- RNAポリメラーゼ (RNAP) は,転写における重要な酵素であり,その活動は関連する分子によって調節することができます.
研究 の 目的:
- 6SRNAがEscherichia coliの転写を阻害するメカニズムを解明する.
- 6SRNAとRNAPの機能的相互作用を調査する.
主な方法:
- 6S RNAとRNAP.の相互作用を研究するための生化学分析.
- RNA合成製品の分析.
- バクテリアの成長段階の移行中のインビボ研究.
主要な成果:
- 6S RNAは,E. coli RNAPの活性部位と安定した複合体を形成し,プロモーターDNA結合を防ぐ.
- RNAPは結合6SRNAをテンプレートとして利用し,短いRNA産物 (pRNA) を合成する.
- pRNA合成は6S RNA-RNAP複合体を不安定化し,pRNA-6S RNAハイブリッドの放出につながります.
- 6SRNA誘導RNA合成は,静止段階の成長過程で発生し,栄養素への反応としてRNAPの放出を促進します.
結論:
- 6S RNAは,RNAPの活性部位と直接接触することによって,転写を積極的に阻害する.
- RNAPによるpRNAの合成は,6SRNA阻害からRNAPを放出するメカニズムとして機能する.
- この調節経路は,栄養素の利用可能期間中にRNAPを解放し,静止期後の遺伝子発現を可能にするために不可欠です.
関連する概念動画
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...
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...
02:30siRNA - 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...
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...
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...