Ena/VASPタンパク質とアクチンフィラメントのキャピングの間の敵対性は,線維細胞の運動性を調節する
James E Bear1, Tatyana M Svitkina, Matthias Krause
1Massachusetts Institute of Technology, Department of Biology, Cambridge 02139, USA.
Cell
|June 28, 2002
まとめ
Ena/VASPタンパク質は,アクチンフィラメントの構造を調節することによって,細胞の運動性に影響を与えます. その欠如は,より遅い,しかしより持続的なラメリポディアス突起につながり,全体的な細胞の動きに影響を与えます.
科学分野:
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- 細胞の運動性は生物学的プロセスにとって極めて重要であり,アクチンポリメリゼーションによって引き起こされるラメリポディアス突起に依存しています.
- Ena/VASPタンパク質は,リステリアのような病原体においてアクチン駆動の運動性を促進することが知られているが,逆説的に細胞転位を抑制する.
研究 の 目的:
- ラメリポディアの突起と細胞の運動性におけるEna/VASPタンパク質の二重の役割を調査する.
- Ena/VASPタンパク質が細胞移動中にアクチン細胞骨格にどのように影響するか解明する.
主な方法:
- Ena/VASP欠乏細胞とEna/VASP過剰発現細胞を分析する.
- ラメリポディアルダイナミクスとアクチンネットワークアーキテクチャの顕微鏡検査.
- アクチン繊維とのEna/VASPの相互作用を決定するインビトロ生化学分析.
主要な成果:
- Ena/VASP欠乏のラメリポディアは,より遅い,より持続的な突起を示し,より短く,枝分かれした繊維を持つ変異したアクチンネットワークを示した.
- 過剰なEna/VASPは,ラメリポディア内のより長く,より少ない枝分かれのアクチンフィラメントをもたらしました.
- 試験管内試験では,Ena/VASPが刺さった端と相互作用することでアクチン線維の延長を促進することを確認しました.
結論:
- Ena/VASPタンパク質は,ラメリポディア内のアクチンフィラメントネットワークの幾何学を調節することによって,細胞運動を調節する上で重要な役割を果たします.
- この発見は,病原体と宿主細胞の運動性に対するEna/VASPの相反する効果のパラドックスを解明しています.
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