リボヌクレアースMRPによる前駆体リボソームRNA処理に関する構造的洞察
Pengfei Lan1,2, Bin Zhou1,2, Ming Tan1,2
1State Key Laboratory of Oncogenes and Related Genes, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.
Science (New York, N.Y.)
|June 27, 2020
まとめ
研究者らは,リボヌクレアースMRP (RNase MRP) が様々なRNA基板を認識する方法を明らかにしました. タンパク質とRNAの共同進化により 単一鎖RNAの処理が可能になり 未発見の役割が多く示唆されています
科学分野:
- 分子生物学
- 生物化学
- 構造生物学
背景:
- リボヌクレアースMRP (RNase MRP) は,真核生物における重要なリボヌクレオプロテイン複合体である.
- 前駆性リボソームRNA (pre- rRNA) 処理と細胞周期調節に関与する.
- RNase MRP基質の認識のメカニズムは,よく理解されているRNase Pとは異なり,不明のままでした.
研究 の 目的:
- RNase MRPの基板認識メカニズムを解明する.
- RNase MRPが RNAの標的とどのように相互作用するかを理解する.
主な方法:
- 電子冷凍顕微鏡 (cryo-EM) を使用して,Saccharomyces cerevisiae RNase MRPの構造を決定しました.
- 酵素単体およびプレ- rRNA断片との複合体で構造が得られた.
- 構造データを補完するために生化学的研究が行われました.
主要な成果:
- この研究は,RNase MRPの冷凍-EM構造を決定した.
- 構造的および生化学的なデータは,RNase MRPが短い,柔軟なコンセンサス配列を通じて単一鎖RNAを認識することを明らかにした.
- タンパク質とRNAサブユニットの共進化は,その機能の鍵として特定されました.
結論:
- RNase MRPは,広範な基板特異性を持つ独特のリボヌクレアースに進化しました.
- 緩やかに定義された配列を認識する能力は,まだ発見されていない多数のRNA基板を示唆しています.
- これらの発見は,細胞プロセスにおけるRNase MRPの役割を調査するための新しい道を開きます.
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