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Bridging the Bio-Electronic Interface with Biofabrication
Published on: June 6, 2012
陽子シャトルと溶解性エポキシードヒドロラーゼにおけるフォスファターゼ活性
Marco De Vivo1, Bernd Ensing, Matteo Dal Peraro
1Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA. mdevivo@cmm.upenn.edu
Journal of the American Chemical Society
|January 11, 2007
まとめ
溶解性エポキシードヒドローラゼ (sEH) の新しいMg2+依存型フォスファターゼ活性が計算的に研究されました. 発見は,メタホスファートのような移行状態と,脂肪酸代謝のための重要な水橋陽子シャトルを含む2段階のメカニズムを明らかにします.
科学分野:
- バイオケミストリー バイオケミストリー
- 酵素学 酵素学とは
- コンピューティング・ケミストリー
背景:
- 溶解性エポキシードヒドロラーゼ (sEH) は,そのN端領域で,新しいMg2+依存型フォスファターゼ活性を示しています.
- この活動は,脂肪酸代謝の理解を拡大し,新しい薬物標的化機会を提供します.
- sEH N末端の折り畳みは,フォスフォトランスフェラーゼ機能で知られているハロ酸脱ハロゲナーゼ (HAD) スーパーファミリーの一部です.
研究 の 目的:
- sEHホスファタゼの活性機構を計算的に調査する.
- 触媒サイクルとその自由エネルギープロフィールを詳細に説明します.
- 金属イオンと陽子のシャトルの作用を触媒で探求する.
主な方法:
- クラシック分子動力学 (MD) シミュレーション.
- 混合量子力学/分子力学 (QM/MM) 計算.
- 提案された2段階の反応機構 (フォスフォ酵素形成と水解) の分析.
主要な成果:
- 詳細な触媒サイクルと自由エネルギープロファイルが明らかになりました.
- メタフォスファートのような移行状態が,フォスフォリル移転で特定されました.
- 酵素による水の脱プロトン化と,金属リガンド水橋 (WB) 経由のプロトンシャトルが確認されました.
- WBは,核フィルの活性化と脱出グループの安定化に不可欠です.
結論:
- この研究は,sEHフォスファタゼの活性に関する包括的なメカニズムとエネルギーに関する記述を提供します.
- 発見は,触媒サイクルにおけるWB媒介型陽子シャトルの重要性を強調しています.
- 構造的な保存は,HADスーパーファミリー内の他の金属依存型リン酸塩に一般化できることを示唆しています.
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