2-オクソグルタレット依存酸化酵素,TauDにおける大規模なレドックス関連再構成の構造的起源
Christopher W John1, Robert P Hausinger2,3, Denis A Proshlyakov1
1Department of Chemistry , Michigan State University , East Lansing , Michigan 48824 , United States.
Journal of the American Chemical Society
|September 3, 2019
まとめ
タウリンヒドロキシラーゼ (TauD) などの2オキシグルタレート (2OG) 依存酸素酶におけるレドックスポテンシャルチューニングは,酵素構造の変化と関連しています. 活性サイト変異の調査は,このダイナミックなプロセスに影響を与える主要な残留物を明らかにします.
科学分野:
- 生化学と分子生物学
- 酵素学
- バイオ有機化学
背景:
- 2-オキシグルトラート (2OG) 依存酸素酵素は,C-H結合の活性化を触媒する重要な酵素である.
- これらの酵素には,一時的な中間物質のメカニズムと熱力学的性質を理解することが重要です.
- タウリンヒドロキシラーゼ (TauD) に関する以前の研究は,その酸化還元能力と酵素構成の関連性を示唆していた.
研究 の 目的:
- TauDにおける酸化還元関連再構成の構造的起源を調査する.
- TauDのリドックスポテンシャルのダイナミックチューニングに対する金属結合残留物の貢献を決定する.
- 他の2OG依存酸素酶におけるこれらの酸化還元結合型変化の一般性を探求する.
主な方法:
- 時間依存のリドックス定位,一時的な光学吸収,赤外線光学化学を含む.
- TauDの活性サイト変種 (H99A,D101Q,H255Q) を生成するためのサイト指向型変異.
- ワイルド型 TauD とその変種間の酸化還元特性と構造変化の比較
主要な成果:
- ワイルドタイプのTauDは,形状の変化に関連した有意な酸化還元能力の変動 (468 mV) を表している.
- 活性サイト変異は,金属-リガンドの置換がこの再編成の運動学と熱力学を変えることを示しています.
- H99Aの変種は最大 redox 変化を示し,H99の redox 結合プロトネーションは高 redox 潜在的な決定的であることを示した.
結論:
- レドックス結合による形状の変化は,H99,D101,H255のような特定の残基を含む,TauDの機能に不可欠です.
- ダイナミックな構造的柔軟性と熱力学的チューニングは,2OG依存性酸素酶ファミリー全体に共通する特徴である.
- この研究は,これらの重要な酵素によるC-H結合活性化のメカニズムの洞察を提供します.
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