Co4O4を含む人工メタロプロテイン キューバンの活性サイト
Lisa Olshansky1, Raúl Huerta-Lavorie2, Andy I Nguyen2
1Department of Chemistry, University of California, Irvine , Irvine, California 92697, United States.
Journal of the American Chemical Society
|February 6, 2018
まとめ
コバルト基地の人工メタロプロテインは 生物学的水酸化を模倣しています タイロシン残基からの水素結合は,合成と自然のシステムを橋渡し,多電子水酸化を可能にします.
科学分野:
- バイオ有機化学
- カタリシス
- バイオミメティック・ケミストリー
背景:
- 人工メタロタンパク質 (ArM) は,天然のメタロ酵素の機能を模倣する設計されたタンパク質です.
- コバルト-テトラカルシウム-酸化物 (Co4O4) キューバンの核は,光システムIIと水酸化触媒の酸素進化複合体と構造的に類似しています.
研究 の 目的:
- Co4O4 キューバンの活性部位で人工メタロプロテインを構成する.
- 水酸化反応の調節における二次球相互作用,特に水素結合の役割を調査する.
- 合成と生物学的水酸化システムの間のギャップを埋めるために
主な方法:
- ビオチン- ストレプタヴィジン技術は,タンパク質内の Co4O4 キューバンの活性部位を固定するために使用されました.
- 水素結合の相互作用を含む,ARMの構造的特徴を決定するために,X線結晶学が使用されました.
- 溶液電気化学は,ARMの酸化ポテンシャルとpH依存の反応性を研究するために使用されました.
主要な成果:
- 結晶学的分析により,固定されたキュバンの場所での水素結合によって安定したCo (III) -OH2分子が明らかになった.
- SerとPhe残留の変種は,pH8まで主に1e-/1H+の化学反応を示し,その後はpHから独立する.
- 単一の水素結合を形成するCo4O4部位にTyr残基を導入すると,pH9.5でマルチ-e/マルチ-H+化学とpH依存のメカニズムシフトが発生し,Tyrデプロトネーションに起因する.
結論:
- 二次球の相互作用,特にチロシンからの水素結合は,人工メタロタンパク質における多電子/多陽子の水酸化を媒介するために重要である.
- これらの発見は,金属酵素の触媒的活動を制御するタンパク質環境の重要性を強調しています.
- 開発されたARMは,生物学的水酸化と合成水酸化触媒の両方を理解するための貴重なモデルとして機能します.
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