暫定性タンパク質-RNA相互作用ガイド 新生リボソームRNA折りたたみ
Olivier Duss1, Galina A Stepanyuk2, Joseph D Puglisi3
1Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA; Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.
Cell
|November 26, 2019
まとめ
バクテリアのリボソーム組立には,リボソームタンパク質 (r-タンパク質) の自己監視新生リボソームRNA (rRNA) の折りたたみが含まれます. このプロセスは一時的なタンパク質結合から始まり 配列組み立ての伝統的なモデルに挑戦します
科学分野:
- 分子生物学
- 生物化学
- 構造生物学
背景:
- リボソーム組成は,リボソームタンパク質 (rタンパク質) が新生リボソームRNA (rRNA) に結合する複雑なプロセスである.
- RNAの折りたたみとタンパク質の相互作用のダイナミクスを理解することは重要ですが,挑戦的です.
- 既存のモデルでは 配列的かつ協同的な組み立ての方法が提案されています
研究 の 目的:
- バクテリアの小さなリボソームサブユニット組成のリアルタイムダイナミクスを調査する.
- 新生rRNAの折りたたみとrタンパク質の結合の相互作用を解明する.
- リボソーム生体形成の現在のパラダイムに挑戦し,精錬する.
主な方法:
- 単分子光顕微鏡を用いて,組み立てプロセスをリアルタイムで追跡した.
- バクテリアの小さなリボソームサブユニットの3'ドメインの折りたたみとタンパク質の組み込みが監視された.
主要な成果:
- 共同転写RNAの折り畳みは,長距離RNAの相互作用によって妨げられます.
- リボソームタンパク質はセルフチャペロンとして作用し,安定した組み込みの前にrRNAの折り畳みを導く.
- 組み立て開始は一時的なタンパク質結合を含み,ダイナミクスは時間とともに減少します.
- この研究では,厳格な配列および協力的な組み立てモデルからの逸脱が観察されました.
結論:
- リボソームの組み立ては,これまで考えられていたよりも,よりダイナミックで,より連続的なプロセスです.
- RNA結合タンパク質の一時的結合は,新生RNAの折りたたみの一般的なメカニズムである可能性があります.
- この研究は,リボヌクレオプロテイン (RNP) 複合体の形成と機能に関する新しい洞察を提供します.
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