関連する実験動画
Updated: Jul 17, 2026
15:31
MISSION esiRNA for RNAi Screening in Mammalian Cells
Published on: May 12, 2010
siRNA非対称性を検出するタンパク質センサー
Yukihide Tomari1, Christian Matranga, Benjamin Haley
1Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
Science (New York, N.Y.)
|November 20, 2004
まとめ
小型の干渉RNA (siRNAs) は,RNA誘発静止複合体 (RISC) に解き放ち,組み立てることでRNA干渉 (RNAi) を誘導する. R2D2タンパク質は,熱力学的非対称性を感知することによって,RISCへの正しいsiRNA鎖の負荷を確保します.
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) は,小さな干渉RNA (siRNAs) が遺伝子発現を調節する生物学的プロセスである.
- siRNAsは処理され,RNA誘発サイレンシング複合体 (RISC) にロードされ,遺伝子サイレンシングを媒介する必要があります.
- RISCの負荷のためのガイドストラムの選択は,RNAi経路の特異性にとって極めて重要です.
研究 の 目的:
- ドロソフィラのRISC負荷のためにsiRNA鎖が選択されるメカニズムを調査する.
- RISCアセンブリのためのsiRNAを指向するDicer-2/R2D2タンパク質複合体の役割を特定する.
- siRNA複合体の熱力学的な非対称性が,ガイドストランドの選択にどのように影響するかを理解する.
主な方法:
- タンパク質-siRNAの相互作用を研究するための生化学分析.
- siRNA複合体とその熱力学的性質の分析.
- RISCの負荷と遺伝子静止を観察するために,ドロソフィラの体内研究.
主要な成果:
- Dicer-2/R2D2ヘテロダイマーは,より大きな二重鎖特性を持つ末端への結合に基づくsiRNA二重複に指向する.
- R2D2は,シRNA末端を5'-リン酸塩と優先的に結合し,これはRISCから除外されます.
- この拘束的好みは,siRNA鎖がRISCに組み込まれることを決定します.
結論:
- R2D2は,siRNA複合体における熱力学的非対称性のセンサーとして機能する.
- R2D2はライセンスファクターとして機能し,本物のsiRNAのみがRNAi経路に入ることを保証します.
- この研究は,siRNA媒介遺伝子サイレンシングにおける重要な規制ステップを明らかにしています.
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...
01:56Riboswitches
Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
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...
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...