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Updated: Jul 2, 2026
10:13
A Microfluidic-based Hydrodynamic Trap for Single Particles
Published on: January 22, 2011
ヘッジホッグは,コンフォメーションスイッチを誘導することによって,滑らかな活動を調節します
Yun Zhao1, Chao Tong, Jin Jiang
1Department of Developmental Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.
Nature
|October 26, 2007
まとめ
リン酸化は,抑制性Argクラスタを破壊することによって,Smoothened (SMO) タンパク質を活性化させ,発達中のヘッジホッグ経路シグナル伝達に不可欠なコンフォメーションスイッチを引き起こします.
科学分野:
- 発達生物学 発達生物学とは
- 分子細胞生物学 分子細胞生物学
- シグナルトランスデュークション
背景:
- ヘッジホッグ (HH) 形態発生経路は,動物の発達に極めて重要です.
- 7つのトランスメンブレーンタンパク質のスムートヘンド (SMO) は,HH信号伝導を媒介するが,その活性化メカニズムは不明である.
研究 の 目的:
- HH信号がSMOを活性化する分子メカニズムを解明する.
- SMO規制におけるリン酸化とアルギニンクラスターの役割を調査する.
主な方法:
- ドロソフィラ・メラノガスターのSMO活性化を研究した.
- SMOの細胞プラズマ尾のリン酸化と変異の影響を分析した.
- SMOの形状の変化と二酸化を調査した.
主要な成果:
- HHシグナリングは,SMOのカーボキシ末端尾のリン酸化を誘導する.
- リン酸化は,阻害性Argクラスタをアンタゴニズし,SMOの自己阻害を緩和する.
- これにより,コンフォームスイッチ,SMO二分化,および細胞表面蓄積が起こり,経路が活性化されます.
結論:
- SMOの活性化には,自己抑制を放出するリン酸化依存型コンフォームスイッチが含まれる.
- SMOタンパク質はレオスタットとして機能し,Argクラスタの微分リン酸化を介して,階層化されたHH信号を異なる発達反応に変換します.
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