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触媒RNAにおける核塩基と二重金属イオンの内球調整
Xin Liu1, Yu Chen1, Carol A Fierke1
1Departments of Chemistry and ‡Biological Chemistry, University of Michigan , Ann Arbor, Michigan 48109, United States.
Journal of the American Chemical Society
|November 9, 2017
まとめ
この研究では,リボヌクレアゼPの特定のRNA塩基が,メタルイオンと触媒としてどのように相互作用するかを明らかにした. 改変されたRNAは活性が低下し,メタルの救出実験では主要な尿素基による直接的な調整が確認された.
科学分野:
- 生物化学
- 分子生物学
- RNAカタリシス
背景:
- 金属イオンと核塩基の役割を理解することは,RNA触媒にとって極めて重要です.
- 細菌のリボヌクレアースP (RNase P) は,tRNA処理に関与する重要なRNA酵素である.
- 以前の研究では,ヘリックスP4座標の金属イオンに保存されたウリジンとグアノシンが示唆されている.
研究 の 目的:
- RNase Pにおける保存された核塩基との金属イオンの相互作用の機能を生化学的に探求する.
- RNase PのP4ヘリックスにおけるウリジン (U51) とグアノシン (G379) の特定の役割を調査する.
主な方法:
- バチルス・サブティリスのPRNAにおける単原子および基礎核酸置換を用いた.
- 修飾された保存されたU51を4-チオウリジン,4-デオキシウリジン,およびアバシク類に.
- 修飾された保存G378/379を2-アミノプリン,N7-デアザグアノシン,および6-チオグアノシンに.
主要な成果:
- U51の機能群改変はRNase Pの触媒を16~23倍に低下させた.
- 4-チオウリジンRNase Pの活動は,Cd (II) またはMn (II) イオンによって部分的に救出され,内部球の調整を示した.
- G379の修正は,外界の金属イオン調整を示唆する,控えめな活動減少を示した.
結論:
- RNase PのP4ヘリックスにおける触媒的に重要な金属イオン相互作用の生化学的証拠を提供する.
- 膨らんだウリジン (U51) は,少なくとも1つの触媒金属イオンを内部球相互作用で直接調整することを示しています.
- 単原子および基底置換の有用性を強調し,大きなRNAにおける核基底機能を探求する.
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