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Nanomanipulation of Single RNA Molecules by Optical Tweezers
Published on: August 20, 2014
テトラヒメナ群IリボジームによるRNA結合と特異性における単一鎖結節の役割
Xuesong Shi1, Sergey V Solomatin, Daniel Herschlag
1Department of Biochemistry, Stanford University, Stanford, California 94305, USA.
Journal of the American Chemical Society
|January 7, 2012
まとめ
テトラヒメナ群Iリボ酵素のJ1/2RNA結合は,触媒活性に著しく影響する. 特定のアデノシン (A29) は,基板結合P1二重体を安定させ,関連するイントロンの保存された分子支配機構を明らかにします.
科学分野:
- 分子生物学は分子生物学である.
- RNA バイオケミストリー
- 構造生物学 構造生物学とは
背景:
- グループIのイントロンは,自己結合RNAである.
- テトラヒメナリボ酵素は,RNA触媒を研究するためのモデルシステムです.
- RNAの結合は,RNAの構造と機能において重要な役割を果たします.
研究 の 目的:
- テトラヒメーナ群I ribozymeのJ1/2RNA結合の機能的役割を調査する.
- J1/2が触媒活動にどのように影響するか,基質P1の二重動力学,ドッキング熱力学を決定する.
- リボジーム機能におけるJ1/2の配列依存性を解明する.
主な方法:
- シングル・ターンオーバー運動分析.
- 光アニソトロピーの測定.
- 単一分子フォースター共振エネルギー転送 (smFRET) 研究.
- J1/2領域のサイト指向性突然変異.
主要な成果:
- J1/2の突然変異,特にアデノシンA29の突然変異は,リボ酵素の活性を (最大2桁の大きさ) 大きく変化させた.
- A29は,ヘリックスP2 (A31·U56) との三次相互作用を通じて,P1二重体のドッキング状態を安定させます.
- 配列解析は,グループIイントロンのサブクラスで5'-spliceサイト選択のためのA29を含む保存された"分子支配者"メカニズムを明らかにしました.
結論:
- J1/2結合は,テトラヒメナ群Iリボ酵素機能に不可欠であり,単純なRNA結合から重要な機能的効果を示しています.
- A29のような交差点核酸によって媒介される三次相互作用は,触媒的形状の安定化に不可欠です.
- RNAの結合配列は,基板の位置付けなどのRNA機能に不可欠な特定の相互作用を媒介するために急速に進化することができます.
関連する概念動画
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...
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...
RNA 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...
RNA 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...
RNA 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...
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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
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The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes, the...
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The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes, the...
