枝分かれとラリアートRNAを合成するデオキシリボ酵素
Yangming Wang1, Scott K Silverman
1Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.
Journal of the American Chemical Society
|June 5, 2003
まとめ
研究者らは,分岐型RNA分子とラリアトRNA分子を効率的に合成できる新しいDNA酵素 (デオキシリボ酵素) を開発した. これらのデオキシリボ酵素は,これらの重要な生化学的中間物質を in vitro で生産するための実用的で一般化可能な方法を提供します.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 合成生物学 合成生物学とは
背景:
- 枝分かれしたRNA分子,特に2",5'-ホスフォディエステル結合を持つものは,重要な生化学的中間物質として機能する.
- ラリアトRNAは,特定の種類の分岐RNAであり,in vivoイントロンスプライシングで生成されます.
- 枝分かれおよびラリアートRNAのインビトロ合成は,限られた一般化可能な方法があるため,合成的に困難です.
研究 の 目的:
- 分岐RNAとラリア RNAを合成できるデオキシリボ酵素を in vitroで特定し,特徴づけること.
- 2',5'の枝分かれRNAとラリアトRNAを製造するための実用的で効率的な方法を開発する.
主な方法:
- デオキシリボジームの発見にインビトロ選択が用いられました.
- デオキシリボ酵素は,内部のRNA2'-ヒドロキシル群と5'-末端のトリフォスファートの結合を促進するために"結合腕"形式を使用して設計されました.
- 温度,二価金属イオン濃度 (Mn2+),pH,時間など,反応条件を最適化しました.
主要な成果:
- 分岐RNAとラリアRNAを効率的に合成する二重金属依存型デオキシリボ酵素が特定されました.
- 2',5'分岐RNAの生成量は,最適化条件 (37°C,20mM Mn2+,pH 7.5) の条件下では,30分未満で少なくとも85%に達し,一部の反応はわずか2分で完了しました.
- 観測された反応速度は,背景反応と比較して,最大500万倍もの速度の大幅な増加を表しています.
- デオキシリボ酵素は,ラリアートRNAを合成する能力も示した.
結論:
- 新型デオキシリボ酵素は,枝分かれおよびラリアートRNAの in vitro 合成のための一般化可能で実用的なアプローチを提供します.
- これらの発見は,これらの重要な核酸構造の準備に重大な影響を及ぼします.
- これらのデオキシリボ酵素から得られた機械的洞察は,核酸酵素による自然分岐RNA形成を理解するために重要である.
関連する概念動画
Nucleic acids
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.
DNA and RNA
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...
DNA and RNA
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...
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...
RNA Stability
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
Nucleic Acids
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.
DNA and RNA
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...
DNA and RNA
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...
RNA Stability
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
Nucleic Acid Structure
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...
DNA Structure
DNA has a double-helix structure. The...


