細胞の粘着. 細胞の粘着. 細胞の粘着. 最小限のカデリン-カテニン複合体は,力の作用でアクチン繊維に結合する
Craig D Buckley1, Jiongyi Tan2, Karen L Anderson3
1Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA.
まとめ
E-カデリンとカテニンを含むアデレンス・ジャンクション (AJ) 複合体は,力によってアクチン線維を結合し,細胞のジャンクションでの力伝導を説明する. このキャッチ・ボンドの行動は,in vivoとin vitroの発見を調和させる.
科学分野:
- 細胞生物学 細胞生物学
- バイオフィジックス 生物物理学
- バイオケミストリー バイオケミストリー
背景:
- アデレンス結合 (AJs) は,組織発育とホメオスタシスに不可欠なアクチン細胞骨格を結びます.
- In vivoの研究では,カデリン-カテニン複合体がフィラメント状 (F) -アクチンに最小限に結合することを示唆しているが,in vitro研究では溶液に結合しないことが示されている.
研究 の 目的:
- カデリン-カテニン複合体のF-アクチンとの相互作用に関する矛盾する発見を調和させる.
- カデリン-カテニン複合体-アクチンフィラメント相互作用の機械的性質を調査する.
主な方法:
- カデリン-カテニン複合体とF-actin.との相互作用を測定するために,光学トラップベースの測定法を使用しました.
- 異なる力条件下での結合解離運動を分析した.
主要な成果:
- ミニマルのカデリン-カテニン複合体は,特に力下でのF-アクチンと安定した結合を形成します.
- 結合解離運動は,強力が結合の安定性を増加させるキャッチ・ボンドモデルに従う.
- 力は,コンプレクスを弱く結合した状態から,アクチン繊維で強く結合した状態にシフトさせます.
結論:
- フォース依存結合は,カデリン-カテニン複合体が細胞-細胞の交差点での機械的力伝導でどのように機能するかを説明します.
- このキャッチ・ボンド・メカニズムは,in vivoとin vitroの観測の間の不一致を解決します.
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