関連する実験動画
Updated: Jun 24, 2026

13:19
Chemical Triphosphorylation of Oligonucleotides
Published on: June 2, 2022
3つの保存されたヌクレオチドを使用した迅速かつ単純なリボジームアミノアシレーションです
N V Chumachenko1, Y Novikov, M Yarus
1Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, Colorado 80309-0347, USA.
Journal of the American Chemical Society
|April 9, 2009
まとめ
研究者らは,アミノアシレーションを行うことができる単純なRNA酵素 (リボ酵素) を発見した. これらの新しいリボ酵素は,最小限の成分で機能し,初期の生物学的触媒と翻訳の洞察を提供します.
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.
- RNAのカタリシス
背景:
- 新しいRNA酵素 (リボ酵素) の発見は,生命の初期段階を理解し,新しいバイオテクノロジーの開発に不可欠です.
- 選択増幅法は,機能的な核酸分子を特定する上で重要な役割を果たしてきました.
研究 の 目的:
- アミノアシレーション活性を持つ新しいRNA酵素 (リボ酵素) を特定し,特徴づけること.
- 新しく発見されたアミノアシラ化リボ酵素の触媒機構と構造的特徴を解明する.
主な方法:
- ランダム化されたRNAプールからリボジームを識別するために選択増幅戦略を適用しました.
- 特定の触媒活性を選択するために,精密なプライマー除去を使用しました.
- 反応機構を研究するために,分子力学に基づく自由エネルギーの最小化を採用した.
主要な成果:
- 3回の選択サイクルを経て,高度に活性なアミノアシレーティングリボ酵素 (k ((cat) = 12-20 min ((-1)) を特定した.
- 活性部位は,保存された3つのニュクレオチドのみで構成され,二価イオンとは独立しています.
- 計算モデリングによる予測と実験的検証により,L-ステレオ選択性,2'-地域選択性,およびアミノ酸側鎖からの独立性が確認されました.
結論:
- 特定されたリボ酵素は,異常に単純な活性部位を有しており,小規模で効率的なリボ酵素を作成するための一般的な経路を示唆しています.
- アデニラートからRNA触媒化されたアミノアシレーションは,CoAチオエステルより単純であり,アデニラートベースの翻訳活性化を説明する可能性がある.
- これらの発見は,翻訳の起源と,エンジニアリングされたRNA触媒の潜在能力についての洞察を提供します.
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...
tRNA Activation
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
tRNA Activation
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
Improving Translational Accuracy
Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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...

