RNA干渉の初期段階におけるバイデント酸リボヌクレアスの役割
E Bernstein1, A A Caudy, S M Hammond
1Cold Spring Harbor Laboratory, New York 11724, USA.
Nature
|February 24, 2001
まとめ
科学者たちは,RNA干渉 (RNAi) に不可欠な酵素であるDicerを特定しました. Dicerは,虫から哺乳類まで,様々な生物の遺伝子サイレンシングを誘導する小さなRNAを生成します.
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,遺伝子サイレンシングのための保存された生物学的プロセスです.
- RNAiは,同類遺伝子の抑制を誘発する二重鎖RNAを伴う.
- 動物では,RNAiは主に ~22-ヌクレオチドガイドRNAsによって媒介され,転写後に発生します.
研究 の 目的:
- RNAiにおける推定ガイドRNAの生成に責任を負う酵素を特定する.
- この酵素の生化学的性質と進化的保存の特徴を明らかにする.
主な方法:
- ヌクレアゼの活性を特定し,特徴づけるための生化学的分析.
- 保存ドメインとホモロジーを決定するためのシーケンス分析.
主要な成果:
- Dicerと名付けられた酵素は,推定ガイドRNAsを生産する能力があると特定されました.
- Dicerは,ヘリコゼと二重のRNase IIIモチーフによって特徴づけられるRNase IIIファミリーのメンバーです.
- Dicerは,哺乳類,植物,菌類を含む多様な種で進化的に保存されています.
結論:
- DicerはRNA干渉経路の重要な酵素であり,ガイドRNAを生成する責任があります.
- 酵素の構造と進化的保存は,遺伝子調節における基本的な役割を示唆しています.
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...
02:41Chromatin Structure Regulates pre-mRNA Processing
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
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...
01:53Bacterial Transcription
RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
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...