関連する実験動画
Updated: Jul 16, 2026

08:30
RNAi Interference by dsRNA Injection into Drosophila Embryos
Published on: April 11, 2011
R2D2は,ドロソフィラRNAi経路のイニシアチブとエフェクターステップの間の架け橋である
Qinghua Liu1, Tim A Rand, Savitha Kalidas
1Howard Hughes Medical Institute and Department of Biochemistry, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA.
まとめ
研究者らは,小さな干渉RNA (siRNA) を結合するためにDicer-2 (DCR-2) と作用するタンパク質であるR2D2を発見した. このDCR-2/R2D2複合体は,ドロソフィラのRNA干渉経路の機能に極めて重要です.
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,遺伝子調節とウイルスに対する防御のための基本的な生物学的プロセスです.
- この経路では,二重鎖RNA (dsRNA) を小さな干渉RNA (siRNA) 分子に処理する.
- その後,siRNA分子はタンパク質複合体を誘導して,メッセンジャーRNA (mRNA) を分解する標的にします.
研究 の 目的:
- ドロソフィラのsiRNA生成に関与するタンパク質成分を特定し,特徴づけること.
- RNA干渉経路における新たに発見されたタンパク質の機能的役割を明らかにする.
主な方法:
- ドロソフィラS2細胞からsiRNAを生成する酵素の浄化.
- 酵素複合体の組成とサブユニットステキオメトリーの生化学分析.
- Dicer-2 (DCR-2) の酵素活性に関する評価,単体および新しいタンパク質R2D2.2との複合体.
- DCR-2/R2D2複合体のsiRNAへの結合特性に関する調査.
- RNA誘発静止複合体 (RISC) によって媒介される配列特異的なmRNA分解における複合体の役割の評価.
主要な成果:
- siRNAを生成する酵素は精製され,Dicer-2 (DCR-2) とR2D2と呼ばれる新しいタンパク質の2つのサブユニットで構成されていることが判明しました.
- R2D2は,C. elegansのRNAiタンパク質RDE-4と同型である.
- R2D2は,DCR-2の酵素活性を変えることはありません.
- DCR-2/R2D2複合体は,DCR-2単独ではないが,siRNA.に結合する.
- この複合体は,RISC.によって媒介される配列特異的なmRNAの分解を強化する.
結論:
- R2D2は,ドロソフィラのsiRNA生成酵素の重要な成分である.
- DCR-2/R2D2複合体は,siRNA結合およびその後のmRNA分解を促進する上で重要な役割を果たします.
- R2D2は,ドロソフィラRNAi経路のイニシアチブ (siRNA処理) とエフェクター (RISC媒介サイレンシング) ステップの間の架け橋として機能する.
関連する概念動画
RNA 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...
RNA 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...
piRNA - 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...
Experimental 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...

