高解像度SHAPE探査によって明らかになったmRNA構造の浸透性規制機能
Anthony M Mustoe1, Steven Busan1, Greggory M Rice2
1Department of Chemistry, University of North Carolina, Chapel Hill, NC, USA.
Cell
|March 20, 2018
まとめ
メッセンジャーRNA (mRNA) 構造は遺伝子発現を制御する. この研究は,E. coliにおける多様なmRNA構造を明らかにし,構造が翻訳効率とタンパク質結合に影響することを示しています.
科学分野:
- 分子生物学
- 遺伝学
- 生物化学
背景:
- 複合的な構造に折りたたむメッセンジャーRNA (mRNA) は,遺伝子発現の調節に不可欠です.
- de novo mRNA構造の特徴づけは,その流行と機能の理解を制限する重要な課題でした.
研究 の 目的:
- 生きたE. coliにおける内生的なmRNAトランスクリプトの核酸解像度構造を定量的にモデル化する.
- mRNAの構造,翻訳,遺伝子調節の関係を調査する.
主な方法:
- SHAPE-MaP (Primer ExtensionとMutational Profilingによって分析された選択的2′-ヒドロキシルアサイレーション) 実験を生きているE. coliで実施した.
- 約400の遺伝子をカバーする 194の内生トランスクリプトを分析した.
主要な成果:
- 個々のmRNAの非常に多様でよく定義されたアーキテクチャを明らかにした.
- 細胞内のmRNA構造を不安定化することが示された.
- 未翻訳領域 (UTR) の35%で保存された構造要素を示し,新しいタンパク質結合モチーフを特定した.
- mRNA構造はリボソーム結合部位で展開運動を介して翻訳効率を調節することを発見した.
結論:
- mRNAの構造は,研究されたすべての遺伝子における遺伝子発現を調節する上で重要な役割を果たします.
- 細胞内と細胞外のmRNA構造の類似性は,構造介的調節のための広範な可能性を示唆している.
- 多くの機能的なmRNA構造は未発見のままである.
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