ループ閉鎖結合による機能性RNAのテンプレートフリーアセンブリ
Long-Fei Wu1,2,3,4, Ziwei Liu1, Samuel J Roberts1
1MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge Biomedical Campus, Cambridge CB2 0QH, United Kingdom.
Journal of the American Chemical Society
|July 26, 2022
まとめ
生命の歴史の初期に 複雑なRNA分子が形成されたことを研究者が示しています 短いRNA鎖はテンプレートなしで機能的なリボ酵素に自己組み立てられ,初期のRNA複製の課題を克服します.
科学分野:
- 生命 研究 の 起源
- 分子 進化
- RNAバイオケミストリー
背景:
- 初期のRNA複製には,非酵素的なテンプレート複製が含まれる可能性が高い.
- 機能性RNAは複雑な折りたたみ構造を有し,複製に課題をもたらす.
- 補完性鎖によるリボエンザイム機能の阻害は重要な進化的障害である.
研究 の 目的:
- 複雑なRNA構造と初期の複製メカニズムの必要性を調和させる.
- 外部テンプレートなしで機能的なリボ酵素を組み立てるための経路を調査する.
- 初期のRNAシステムにおけるテンプレート媒介阻害の課題に対処する.
主な方法:
- オーバーハングを持つ短いRNA複合体の非酵素クロスストランド結合.
- 複合体をRNA幹ループ構造に変換する.
- 全長リボ酵素を組み立てるためのループ閉鎖結合反応.
主要な成果:
- RNA複合体の非酵素変換が幹ループ構造に実証された.
- ループクロージングによる機能的なリボ酵素の組み立てを示した.
- 複雑な機能的なRNA形成のためのテンプレートフリー経路を確立した.
結論:
- 初期の進化における複雑な機能性RNAの出現のありそうな経路を提案している.
- 初期の原細胞ゲノムには 短い複製オリゴヌクレオチドの集合体が含まれる可能性があることを示唆している.
- 初期のRNAベースの生命における複製の課題とテンプレート阻害を克服するためのメカニズムを提供します.
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