フィブロネクチンと細胞骨格の間の2ピコニュートンスリップボンドは,タリンに依存しています
Guoying Jiang1, Grégory Giannone, David R Critchley
1Department of Biological Sciences, Columbia University, 1212 Amsterdam Avenue, New York, New York 11027, USA.
Nature
|July 18, 2003
まとめ
研究者らは,細胞力学にとって極めて重要な分子スリップボンドを発見した. フィブロネクチンとタリン1を含むこの結合は,2-pN力が破裂し,細胞の生存能力と臓器機能に影響を及ぼします.
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:
- インテグリン-細胞骨格の結合のような細胞構造に対する機械的力は,細胞の生存能力,形態学,臓器機能に不可欠です.
- これらの力は,細胞外マトリックス-インテグリン複合体を細胞骨格と結びつける分子結合によって生成されます.
- ミニマルのマトリックス複合体,フィブロネクチンのFNIII7-10ドメインのトリマーが,インテグリン-細胞骨格の結合を媒介する.
研究 の 目的:
- 細胞力の生成に関与する最小マトリックス複合体の機械的性質を調査する.
- インテグリン-細胞骨格の接続の確立に関与する分子プレーヤーと力を特定する.
- フィブロネクチン-インテグリン複合体とアクチン細胞骨格の間の力伝送を媒介するタリン1の役割を明らかにする.
主な方法:
- 単一トリマービーズを使用して,力下でのフィブロネクチンFNIII7-10トリマーの機械的振る舞いを研究しました.
- 結合破裂力を測定するために,セルラー負荷率 (60 nm x s(-1)) を適用した.
- スリップボンド形成と細胞骨格結合の必要性を評価することによって,タリン1の役割を調査した.
- アルファ (((v)) ベータ3 インテグリンとベータ3 削除へのフィブロネクチンの結合を阻害することで,力発生への影響を調べました.
主要な成果:
- 特定の分子スリップボンドが特定され,細胞の負荷率で2pNの力によって繰り返し破壊されました.
- この2pNスリップボンドは,単一トリマービーズでは観察されたが,モノメリックユニットでは観察されなかった.
- タリン1は,2-pNスリップ結合と細胞骨格の急速な結合に不可欠であることが判明しました.
- フィブロネクチン-アルファ ((v) ベータ3結合とベータ3欠失の阻害は,2-pN力のピークを著しく減少させた.
結論:
- タリン1は,おそらくフィブロネクチン-インテグリン複合体とアクチン細胞骨格の間の初期分子スリップ結合を形成する.
- このスリップボンドメカニズムは,複数の結合が形成されるか,信号がより強い力反応を活性化するまで,低レベルの力をフィブロネクチンに適用することを可能にします.
- これらの分子力メカニズムを理解することは,細胞の生存能力,形態学,および臓器の機能を理解するために重要です.
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