C. fumagoのクロロペロキシダゼもデハロペロキシダゼである:ハロフェノールの酸化による脱ハロゲン化
Robert L Osborne1, Gregory M Raner, Lowell P Hager
1Department of Chemistry and Biochemistry and School of Medicine, University of South Carolina, Columbia, 29208, USA.
Journal of the American Chemical Society
|January 26, 2006
まとめ
Caldariomyces fumago chloroperoxidase (CCPO) は,ハロフェノールの酸化脱酸化を効率的に触媒化し,ベンゾキノンを形成する. この強力な酵素は,アロマティック脱ハロゲン化反応のバイオメディエーション触媒としての潜在能力を示しています.
科学分野:
- バイオケミストリー バイオケミストリー
- 環境科学 環境科学
- 酵素学 酵素学とは
背景:
- ハロゲン化フェノールは環境汚染物質である.
- カルダリオマイセス・フマゴ (Caldariomyces fumago) の塩素過酸化酵素 (CCPO) は,ヘムを含む強力な酵素である.
- ペロキシダゼは酸化反応を触媒する酵素です.
研究 の 目的:
- CCPOによるハロフェノールのH2O2依存性酸化脱ハロゲン化を調査する.
- 脱ハロゲン化におけるCCPOの反応産物と触媒効率を決定する.
- CCPO触媒による脱ハロゲン化のメカニズムを解明する.
主な方法:
- 紫外線で見える吸収スペクトロスコピーは,
- 高性能液体クロマトグラフィー (HPLC)
- ガス染色体/質量スペクトロメトリ (GC/MS)
主要な成果:
- CCPOは,酸性条件下で2,4,6-トリハロフェノルを2,6-ジハロ-1,4-ベンゾキノンに効果的に脱ハロゲン化します.
- CCPOは,ホースラディッシュペロキシダゼに匹敵する触媒効率を示しています.
- p-ハロフェノールの脱ヒロゲン化により,主要産物としてダイマー,次要産物として1,4-ベンゾキノンが得られます.
- この研究は,CCPOをCys結合ペロキシダースとしてデハロペロキシダースとして機能するCys結合ペロキシダースとして識別し,以前に研究されたHis結合ペロキシダースとは異なる.
結論:
- CCPOは,ハロゲン化と脱ハロゲン化の両方を行うことができる汎用性のある酵素です.
- 提案された電子伝送機構は,観測された産物を説明する.
- CCPOの強度と脱ハロゲン化活動は,芳香質汚染物質の生物修復におけるその潜在的な応用を示唆しています.
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