1つの結合部位は,テトラヒメナ前-rRNAの自己スプライシング,トランススプライシング,RNA酵素活性性のシーケンス特異性を決定する
Cell
|October 24, 1986
まとめ
この研究は,テトラヒメナ前リボソームRNA (rRNA) の干渉配列 (IVS) を調査し,特定の塩基配列規則がRNA酵素活性をどのように支配するかを明らかにします. 配列の変更は,スプライシングの精度と他の触媒機能に影響し,RNA酵素特異性の予測可能な変化を示しています.
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
- RNAのカタリシス
背景:
- テトラヒメナの前リボソームRNA (rRNA) の干渉配列 (IVS) は,触媒的リボ酵素として機能する.
- RNA酵素反応の特異性を理解することは,分子生物学にとって極めて重要です.
- サイト特異変異は,RNA-タンパク質とRNA-RNAの相互作用を解剖するための強力なツールです.
研究 の 目的:
- Tetrahymena pre-rRNA self-splicingにおける5'スプライスサイト選択に不可欠な配列を定義する.
- IVS内の突然変異が,その触媒活動と基板特異性にどのように影響するか調査する.
- RNA酵素の特異性がベースペアリングのルールに基づいて予測可能に変化できるかどうかを判断する.
主な方法:
- サイト固有の変異遺伝子を利用して,テトラヒメナ前rRNAIVS.に単基変化を導入する.
- セルフスプライシング中の5'スプライスサイト選択に対するこれらの変異の影響を分析した.
- 配列変化が分子間エクソン結合 (トランススプライシング) とヌクレオチジルトランスフェラーゼ活性に与える影響を評価する.
主要な成果:
- 精密な5'スプレイスサイト選択に不可欠な2つのキーシーケンスが特定されました.
- これらの配列または5'エクソン結合部位における単基の変化は,非効率的または不正確なスプライシングにつながった.
- 複合変異によって補完性を回復させることで,単基の変化の効果は抑制された.
- 5'エクソン結合部位の変異は,トランススプライシングとヌクレオチジルトランスフェラーゼ活動の特異性を変化させた.
結論:
- Tetrahymena IVS RNA酵素の基板特異性は,ワトソン・クリックの塩基配列規則によって決定されています.
- RNA酵素の特異性における予測可能な変化は,塩基配列に関与する配列を変更することによって達成できます.
- この研究は,リボ酵素触媒とRNAベースの遺伝情報処理のメカニズムに関する根本的な洞察を提供します.
関連する概念動画
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 Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
Ligand Binding and Linkage
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
Allosteric Proteins-ATCase
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
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...


