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アジドグループによる支援により,非ヘム鉄ヒドロキシレースの再利用により,触媒性ニトリル装置が可能になる
Madison Davidson1, Meredith McNamee1, Ruixi Fan2
1Department of Chemistry , North Carolina State University , Raleigh , North Carolina 27695 , United States.
Journal of the American Chemical Society
|February 14, 2019
まとめ
鉄酵素は,アジド群を導入することによって,ヒドロキシルではなくニトリルを形成するように再誘導することができる. この発見により,非ヘム鉄と2オキシグルタレット依存酵素の触媒能力が拡大した.
科学分野:
- 生物化学
- 酵素学
- 有機化学
背景:
- 非ヘム鉄と2オキシグルタレート (Fe/2OG) に依存する酵素は,水酸化反応を触媒化する.
- 以前に特定された酵素には,l-Ile 4-ヒドロキシラーゼ,l-Leu 5-ヒドロキシラーゼ,およびポリオキシン二ヒドロキシラーゼが含まれています.
研究 の 目的:
- レウシン同位体によるFe/2OGヒドロキシラーゼの基板範囲を調査する.
- Fe/2OG酵素の触媒活性が基板改変によって再方向化することを実証する.
- 定規の水酸化を超えた新しい酵素変換を探求する.
主な方法:
- レウシン同位体と改変基質を用いた酵素測定
- 地域特異性を決定し,新しい変異を特定するために反応産物の特徴づけ.
- C-H結合の活性化とアジドグループ指向のニトリル形成を含むメカニズム研究.
主要な成果:
- Fe/2OGヒドロキラーゼは,レウシン同位体を取り入れて,地域特有のヒドロキラーゼを触媒化する.
- アジド群を導入すると,酵素はヒドロキシル群の代わりにニトリル群を導入する.
- 反応はFe (IV) -オクソ種によるC-H結合の活性化を経て,続いてアジド誘導によるCN結合の形成が行われます.
結論:
- Fe/2OG酵素は,以前より幅広い基板受容性と触媒的汎用性を示しています.
- 基板補助工学は,Fe/2OG酵素を,ニトリル装置のような非本来の反応を実行するためにリダイレクトすることができます.
- この研究は,Fe/2OG酵素の合成レパートリーを拡大するための新しい道を開きます.
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