トランスクリプトーム全体のスノRNA標的識別によって明らかになったsnoRNA促進されたタンパク質分泌
Bei Liu1, Tong Wu1, Bernadette A Miao2
1Department of Chemistry, The University of Chicago, Chicago, IL 60637, USA; Howard Hughes Medical Institute, Chicago, IL 60637, USA.
Cell
|November 23, 2024
まとめ
小核RNA (snoRNAs) は,非正規の機能のためにメッセンジャーRNA (mRNAs) を標的とすることができる. 新しい化学的クロスリンク方法により,SNORA73を含む数千のスノRNA-mRNA相互作用がタンパク質分泌を促進しています.
科学分野:
- 分子生物学
- RNA 生物学
- ゲノミクス
背景:
- 小核RNA (snoRNAs) は,主に2'-O-メチル化および偽ウリジンなどのRNA改変を誘導することが知られている.
- スノRNA,特にメッセンジャーRNA (mRNA) の全範囲のRNA標的は,技術的な限界のために十分に理解されていません.
- スノRNAの標的を広く特定することは,RNAの改変を超えてその多様な細胞の役割を理解するために不可欠です.
研究 の 目的:
- スノRNA標的の包括的なトランスクリプトーム全体の識別のための新しい化学クロスリンクベースの技術を開発し,適用する.
- スノRNAと他の細胞RNA,特にmRNAとの間に以前に認識されていない相互作用を発見する.
- 特定されたsnoRNA-mRNAの相互作用,特に非正規の役割の機能的影響を調査する.
主な方法:
- RNA-RNAの相互作用を捕捉し,特定するための化学クロスリンクベースのアプローチの開発.
- スノRNA標的を検出するために人間の細胞とマウスの脳組織に適用する.
- スノRNAとmRNAの相互作用をトランスクリプトーム全体で特定し,定量化するためのバイオ情報分析.
主要な成果:
- ヒトの細胞とマウスの脳では,これまでに認識されていない何千ものスノRNA-mRNA相互作用が特定されました.
- これらの相互作用の有意な部分は,既知のsnoRNA誘導RNA改変部位の外で発生し,非正規の機能を示唆しています.
- snoRNA SNORA73は,分泌および膜タンパク質をコードするmRNAを標的とし,信号認識粒子 (SRP) の構成要素である7SL RNAと相互作用することが判明した.
結論:
- 開発された化学クロスリンク方法では,スノRNA-RNAの相互作用の広範囲を効果的に識別し,スノRNAの既知の標的を拡大します.
- SnoRNAは,mRNAや7SLRNAのような他のRNAと相互作用し,細胞のプロセスに影響を及ぼします.
- SNORA73は,標的mRNAと7SLRNAとの相互作用を利用して,SRP結合を強化し,それによって暗号化されたタンパク質の分泌を促進します.
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