RNAi酵素複合体の組み立てにおける非対称性
Dianne S Schwarz1, György Hutvágner, Tingting Du
1Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Lazare Research Building, 364 Plantation Street, Worcester, MA 01605, USA.
Cell
|October 22, 2003
まとめ
小型の干渉RNA (siRNA) 二重複体の5'端の塩基対の安定性は,RNA干渉 (RNAi) 経路のための鎖選択を決定する. この構造的非対称性は,siRNA機能とmicroRNA (miRNA) バイオゲネシスの両方に影響を及ぼします.
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,RNA誘発サイレンシング複合体 (RISC) を含む重要な生物学的プロセスである.
- タンパク質-siRNA複合体であるRISCは,標的RNA分子の分裂を媒介する.
- RISCの組み立てを理解することは,RNAiメカニズムを理解するための鍵です.
研究 の 目的:
- RISCの組み立て中に糸の選択を左右する要因を調査する.
- siRNA複合体がRNAi経路への参加において非対称性を示すかどうかを判断する.
- この非対称性の影響について,siRNA機能とmicroRNA生物発生の両方に探求する.
主な方法:
- siRNAの二重構造と5'端の塩基対安定性の分析.
- RISCアセンブリにおける個々のsiRNA鎖の参加を評価するための機能分析.
- マイクロRNA (miRNA) バイオゲネシス経路との比較分析.
主要な成果:
- siRNA二重複体の5'端の塩基対の安定性は,RISCアセンブリのための鎖の適格性に大きく影響する.
- siRNA複合体は機能的に非対称であり,RNAiを誘発する鎖は1つしかない.
- RISCアセンブリに固有のこの非対称性は,miRNAバイオゲネシスのメカニズムとして提案されています.
結論:
- RISCアセンブリは,siRNA活動における機能的非対称性の源である.
- siRNA複合体の構造特性は,RISC.に鎖の負荷を決定する.
- このメカニズムは,デュプレックス前駆体から単一鎖のmiRNAsの生成に関する洞察を提供します.
関連する概念動画
01:23RNA Structure
Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
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 Structure
Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
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...
02:15Experimental 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...
01:19RNA Structure
The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...