フリンジは,ノッチを改変するグリコシルトランスフェラーゼです.
D J Moloney1, V M Panin, S H Johnston
1Department of Biochemistry and Cell Biology, Institute for Cell and Developmental Biology, SUNY-Stony Brook, New York 11794-5215, USA.
Nature
|August 10, 2000
まとめ
フリンジタンパク質は,細胞シグナル伝達に不可欠なプロセスである砂糖を加えることで,ノッチ受容体を修正します. このグリコシル化メカニズムは細胞の運命を左右し,細胞間通信を理解するために不可欠です.
科学分野:
- 細胞および分子生物学
- 発達生物学 発達生物学について
- バイオケミストリー バイオケミストリー
背景:
- ノッチ受容体は,細胞間のシグナル伝達経路の鍵であり,細胞の運命,増殖,アポトーシスを調節します.
- フリンジタンパク質は,リガンドによってノッチ受容体の活性化を調節する.
- フリンジ作用の正確な生化学的メカニズムは不明のままである.
研究 の 目的:
- フリンジタンパク質がノッチシグナリングを調節する生化学的メカニズムを解明する.
- ノッチ受容体のフリンジ媒介による翻訳後の改変の役割を調査する.
主な方法:
- フリンジタンパク質の活性に関する生化学的特徴.
- Fringeの基板特異性を決定するためのインビトロ酵素分析.
- 哺乳類の細胞におけるコカルチャーアッセイは,Notch信号調節を評価する.
- ドロソフィラの酵素学的に無活性なフリンジ変異体の発現は,in vivoの機能を検証する.
主要な成果:
- ドロソフィラと哺乳類のフリンジタンパク質は,フコゼ特異のβ1,3N-アセチルグルコサミニルトランスフェラーゼ活性を示しています.
- Fringeは,ノッチ受容体の表皮成長因子のような繰り返しのO結合フコース残基の延長を開始する.
- 生物学的測定は,ノッチ上のフリンジ依存のO-リンクされたフコースの伸びがノッチのシグナリングを調節することを確認しました.
結論:
- フリンジタンパク質は,グリコシルトランスフェラーゼとして機能し,O-リンクされたフクロース延長経由でノッチ受容体を改変する.
- この翻訳後の改変は,Notchシグナリングを調節する重要なメカニズムである.
- Fringeによる差分受容体グリコシル化は,他のシグナル伝達システムに潜在的関連性を持つ,シグナル伝達経路が調節される新しい方法を表しています.
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