Notch-Jagged複合構造は,リガンドのセンシビリティの調節にキャッチボンドを伴う
Vincent C Luca1,2, Byoung Choul Kim3,4, Chenghao Ge5
1Departments of Molecular and Cellular Physiology and Structural Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.
まとめ
ノッチ受容体の活性化には,機械的な力とグリコシル化が不可欠である. 新しい構造データは,Notch1に結合するJagged1が,細胞の運命を決定するためにこれらの力をどのように使用しているかを明らかにしています.
科学分野:
- 細胞生物学
- 構造生物学
- 生物化学
背景:
- 細胞の運命を決定する上で重要なものです.
- この経路は機械的力とタンパク質のグリコシル化に依存する点でユニークです.
- 分子相互作用を理解することは ノッチ経路の規則を解読する鍵です
研究 の 目的:
- Notch1とJagged1 (Jag1) の相互作用の構造的基礎を明らかにする.
- Notch1-Jag1結合における機械的力とグリコシレーションの役割を調査する.
- Notch1のJag1への結合とデルタ型4 (DLL4) リガンドを比較する.
主な方法:
- 2.5アングストロムの解像度でX線結晶撮影
- タンパク質とタンパク質の結合界面の分析
- タンパク質の糖化変化の特徴 (O結合フコゼ)
主要な成果:
- Notch1-Jag1 細胞外複合体の詳細な構造が決定された.
- Notch1 EGFドメイン8と12のO結合フコースは,Jag1 EGF3とC2ドメインと相互作用する.
- Jag1は,機械的な力によって影響を受け,Notch1の結合時にキャッチボンドの振る舞いを示します.
- Notch1は,DLL4結合と比較して,Jag1結合に異なるドメインを使用しています.
結論:
- Notch1- Jag1の相互作用には,機械的な力や特定のグリコシル化パターンが重要です.
- Jag1のキャッチ・ボンドの振る舞いは,ノッチ・シグナリングの力依存の調節を可能にします.
- これは,リガンドの差別化と,メカニカルシグナルを通してノッチシグナルの強化のためのメカニズムを提供します.
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