C3POは,RISCの活性化を促進することによってRNAiを促進するエンドロビヌクレアースです
Ying Liu1, Xuecheng Ye, Feng Jiang
1Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
まとめ
研究者らは,タンパク質複合体であるC3POをRNA誘発静止複合体 (RISC) の主要な活性化剤として特定した. C3POは,特定のRNA断片を取り除き,遺伝子サイレンシングを強化することにより,RNA干渉 (RNAi) を促進します.
科学分野:
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
- 遺伝学 遺伝学とは
背景:
- RNA干渉 (RNAi) は重要な遺伝子調節メカニズムである.
- RNA誘発サイレンシング複合体 (RISC) はRNAiの中心であり,標的mRNAの分裂を媒介する.
- RISCの組み立てとアクティベーションを理解することは,RNAi技術を活用する鍵です.
研究 の 目的:
- コアRNA誘発サイレンシング複合体 (RISC) をin vitroで再構成する.
- RISC活動の新たな規制者を特定する.
- RISCのアクティベーションのメカニズムを解明する.
主な方法:
- 再結合ドロソフィラタンパク質:Dicer-2,R2D2,およびAgo2.2を使用してRISC活動の再構成.
- 再構成されたシステムを用いてRISC関連因子の浄化.
- 精製された因子の機能を特徴付けるための生化学的分析.
主要な成果:
- 精製した成分からRISCの活性をインビトロで成功裏に再構成した.
- 新種のRISC活性化複合体であるC3PO (RISCのコンポーネント3プロモーター) を特定し,浄化し,TranslinとTrax.で構成されています.
- C3POはMg2+依存型エンドロビヌクレアースであり,siRNAの乗客鎖を分割することを実証した.
- C3POは,乗客のスレッド割れ分を除去することによってRISCの活性化を促進することを示しました.
結論:
- RNAiコアメカニズムを再構成するための機能的なin vitroシステムを確立しました.
- 効率的なRNA干渉に不可欠なRISCの重要なアクティベーターとしてC3POが特定されました.
- siRNAの乗客鎖におけるC3POの酵素活性は,RISCの機能に不可欠である.
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...
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...
siRNA - 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...
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...
Ribozymes
The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
Ribozymes can be...
Ribozymes can be...

