フォトオリゴメリザブルシードを使用して,生体細胞のローカルおよびグローバル液相行動のマッピング
Dan Bracha1, Mackenzie T Walls1, Ming-Tzo Wei1
1Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08544, USA.
Cell
|December 1, 2018
まとめ
細胞は低量のタンパク質でも 液体液体相分離を用いて局所的な構造を作り出すことができます これは,核形成部位にタンパク質を集中させ,細胞内組織のためのグローバルな濃度制限を回避することによって達成される.
科学分野:
- バイオ物理学
- 細胞生物学
- 分子生物学
背景:
- 液体-液体相分離 (LLPS) は細胞内構造の形成に不可欠である.
- LLPSの正確な局所化は,特に低濃度のタンパク質については,まだ十分に理解されていません.
- 局所的なLLPSを制御する生体物理的原理は不明である.
研究 の 目的:
- 局所的な細胞内相分離の生体物理的メカニズムを調査する.
- 細胞内相図をマッピングし,タンパク質配列に依存する移行メカニズムを理解する.
- 局所的なLLPSを駆動する 低濃度のタンパク質を探る
主な方法:
- バイオミテック・オリゴメライジング・システムの開発"コレレット"
- 細胞内相図を素早く定量的にマッピングするために,光制御による調節性を利用する.
- 実験的なアプローチと コンピュータによるシミュレーションを組み合わせる
主要な成果:
- 細胞内濃度は全相分離には不十分かもしれない.
- タンパク質リガンドを核化センターに隔離することで局所的相分離が誘発される.
- 拡散捕獲メカニズムにより,LLPSは全体的なタンパク質の豊富さに依存しない.
結論:
- 局所的な相分離は,高レベルのタンパク質濃度なしに達成できます.
- 拡散捕捉メカニズムは細胞内凝縮物のパターニングの鍵です.
- このメカニズムは 凝縮物形成のためのタンパク質の豊富さの制限を克服する方法を 細胞に提供します
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