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パッセンジャー・ストランド・クリバージュは,siRNAのアゴ2を含むRNAi酵素複合体への組み立てを促進します
Christian Matranga1, Yukihide Tomari, Chanseok Shin
1Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA.
Cell
|November 8, 2005
まとめ
Argonaute2 (Ago2) は,二重鎖の小干渉RNA (siRNA) を直接結合し,乗客鎖を割って,RNA誘発静止複合体 (RISC) にガイド鎖の組み込みを可能にします. このメカニズムは,siRNA媒介の遺伝子サイレンシングにおいて極めて重要です.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- RNA干渉 (RNAi) 経路は,小さな干渉RNA (siRNAs) を利用して,Argonaute2 (Ago2) をメッセンジャーRNA (mRNAs) を分割するように指示することによって,遺伝子発現を沈黙させます.
- Ago2タンパク質は,RNA誘発サイレンシング複合体 (RISC) の触媒核であり,遺伝子のサイレンシングを担当する酵素複合体である.
- 以前は,ATPに依存したヘリケーゼが,アゴ2.2にガイドストランドをロードする前にsiRNA鎖を分離すると仮定されていた.
研究 の 目的:
- siRNAの誘導鎖が活性RISC.に組み込まれるメカニズムを調査する.
- siRNAsとのRISCアセンブリの初期段階におけるAgo2の役割を決定する.
主な方法:
- Ago2の双鎖siRNAとの相互作用を直接観察した.
- Ago2.2によるsiRNA旅客鎖の割れ方の分析
- siRNAとmicroRNA (miRNA) のロードメカニズムをRISC.に比較する.
主要な成果:
- Ago2は,RISCアセンブリマシンから直接二鎖siRNAを受信する.
- Ago2は,siRNAの乗客鎖を割って,単鎖のガイド鎖を放出する.
- この分断補助メカニズムは,siRNAがRISCにロードされる主な経路です.
- パッセンジャー・ストランド・クリバージは,不完全なマッチングのデュプレックスから生じるmiRNAの組み込みにはそれほど重要ではない.
結論:
- siRNAをRISCに組み込む主なメカニズムは,Ago2がsiRNAデュプレックスに直接結合し,乗客鎖を裂くことです.
- この発見は,RNA干渉経路の開始に関する私たちの理解を洗練し,Ago2.2の重要な酵素的機能を強調しています.
- このメカニズムは,microRNAsでは異なっており,異なる小型のRNAクラスの異なる負荷経路を示唆しています.
関連する概念動画
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...
02:57piRNA - Piwi-interacting RNAs
PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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...
02:30Small interfering RNAs (siRNA)
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...