EGFのシグナリングネットワークのタイムレギュレーションは,支架タンパク質 Shc1 によって行われる
Yong Zheng1, Cunjie Zhang, David R Croucher
1Samuel Lunenfeld Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto M5G 1X5, Canada.
Nature
|July 13, 2013
まとめ
Shc1スキャフォルドタンパク質は,EGF刺激後のシグナリングを,明確なリン酸化イベントとタンパク質の相互作用を通じて制御する. 細胞の成長を促すから,細胞の侵入と形状の調節に切り替わります.
科学分野:
- 細胞生物学 細胞生物学
- 分子シグナル伝達です.
- タンパク質の生化学
背景:
- 細胞表面受容体は,サイトプラズマの標的を募集するために,脚架タンパク質を利用し,その正確な機能は不明である.
- レセプターチロシンキナーゼ (RTK) は,フォスフォチロシン結合ドメイン (PTB) を有するShc1のような支架を活性化させ,下流シグナル伝達に不可欠です.
- スキャフォールドタンパク質のダイナミクスを理解することは,複雑な細胞通信ネットワークの解読の鍵です.
研究 の 目的:
- Epidermal Growth Factor (EGF) 刺激に対するShc1スキャフォールドタンパク質のダイナミックな反応を解明する.
- Shc1機能を制御する連続的なリン酸化イベントとタンパク質の相互作用を特定する.
- 時間の信号流と経路のスイッチングにおけるShc1の役割を決定する.
主な方法:
- EGFの刺激後のShc1のリン酸化とタンパク質の相互作用を分析するために,定量的質量スペクトロメトリが使用されました.
- 時間解析解析では,Shc1.1にタンパク質結合する明確な波が捕捉されました.
- 機能的アッセイでは,Shc1媒介のシグナリングが細胞プロセスに与える影響を評価した.
主要な成果:
- Shc1はEGFの刺激により,複数の波の異なるリン酸化とタンパク質の相互作用を経験します.
- 最初,Shc1は,Grb2アダプタがフォスフォチロジン部位に結合することによって,プロミトジェニック/生存経路を活性化するタンパク質を勧誘する.
- その後,Akt媒介のリン酸化がPtpn12を誘導し,Shc1をSgK269媒介の経路に切り替え,細胞侵入と形態変異を調節する.
結論:
- Shc1スキャフォールドタンパク質は,EGF刺激後の信号伝達タイミングの重要な調節剤として作用します.
- Ptpn12は分子スイッチとして機能し,Shc1信号を成長促進経路から細胞形態学調節経路に変換する.
- Shc1のダイナミックな相互作用は,情報の時間的な流れをオーケストラ化し,多様な細胞機能に影響を与えます.
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