m6AはmRNAの相分離能力を高める
Ryan J Ries1, Sara Zaccara1, Pierre Klein1
1Department of Pharmacology, Weill-Cornell Medical College, Cornell University, New York, NY, USA.
Nature
|July 12, 2019
まとめ
mRNAのN6-メチラデノシン (m6A) 変異は,YTHDFタンパク質の液体-液体相分離を誘導する. mRNAの複数のm6A部位は支架として機能し,コンパートメント特有の調節を通してmRNAの運命を影響する.
科学分野:
- 生物化学
- 分子生物学
- 細胞生物学
背景:
- N6-メチラデノシン (m6A) は,最も豊富に存在するmRNAの改変であり,細胞プロセスに影響を与える.
- m6AがmRNAの運命を影響する正確なメカニズムと細胞の文脈に依存する効果は不明である.
研究 の 目的:
- m6A結合タンパク質 (YTHDF1-3) のmRNA調節における役割を調査する.
- m6A媒介 mRNAの運命決定の基礎となる生体物理的メカニズムを解明する.
主な方法:
- 液体-液体相分離試験を in vitro と細胞内で行う.
- m6A改変mRNAとYTHDFタンパク質の相互作用の分析
- 段階隔離された細胞区間のmRNA局所化の調査.
主要な成果:
- YTHDF1,YTHDF2およびYTHDF3タンパク質は,液体-液体相分離を経験する.
- 段階分離は,複数のm6Aサイトを持つmRNAによって著しく強化され,それらは支架として作用する.
- mRNA- YTHDF複合体はP体やストレス粒子のような内生的な区画に分割され, mRNAの安定性と翻訳を調節する.
結論:
- m6Aサイトの数と分布は,トランスクリプトームの相分離を調節する.
- 液体-液体相分離原理は,m6A改変mRNAの細胞特性を支配する.
- m6A媒介の相分離は,コンパートメント特有のmRNA調節のためのメカニズムを提供します.
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