細胞内相分離の組成に依存する熱力学
Joshua A Riback1, Lian Zhu1, Mylene C Ferrolino2
1Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, USA.
Nature
|May 15, 2020
まとめ
細胞内凝縮物は液体液相分離 (LLPS) によって形成されるが,固定的飽和濃度はない. 代わりに,多成分相互作用がLLPSを駆動し,調節可能なコンデンサート組成と機能を可能にします.
科学分野:
- 細胞生物学
- バイオ物理学
背景:
- 液体-液体相分離 (LLPS) によって形成される膜のない臓器.
- LLPSは同型相互作用と固定された飽和濃度によって引き起こされると考えられています.
- この固定濃度モデルは,複雑な細胞環境ではほとんどテストされていません.
研究 の 目的:
- 固有のLLPSにおける多成分相互作用の役割を調査する.
- 細胞内コンデンサットが固定された飽和濃度を示すかどうかを判断する.
- コンデンサートの形成と機能を理解するための熱力学的枠組みを確立する.
主な方法:
- 生体細胞における内生凝縮物の分析
- コンポーネントの分割と濃度の変化の定量化
- バイオ分子相互作用の熱力学モデリング
主要な成果:
- 固有のLLPSは,固定された飽和濃度ではなく,異型相互作用によって支配されています.
- コンデンサートの組成は,タンパク質とRNAの相互作用の熱力学によって細かく調整されます.
- リボヌクレオプロテイン複合体などの組立複合体の選択的排除が観察された.
結論:
- 細胞内凝縮物は固定された飽和濃度を持っていません.
- ヘテロタイプの相互作用は,細胞におけるLLPSの主要な原動力である.
- この研究は,様々な臓器に適用可能な凝縮物の行動と機能の熱力学的基礎を提供します.
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