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Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c
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サイトクロームP450における基質認識経路のマッピング
Navjeet Ahalawat1, Jagannath Mondal1
1Tata Institute of Fundamental Research, Center for Interdisciplinary Sciences , Hyderabad 500107 , India.
Journal of the American Chemical Society
|November 28, 2018
まとめ
サイトクロームP450酵素は,大きなタンパク質開口ではなく,基板誘発の構造変化を含む,単一の支配的な経路を利用します. これは,これらの重要な金属酵素の触媒センターに基板がどのように到達するかを明らかにします.
科学分野:
- 生物化学
- 酵素学
- 構造生物学
背景:
- サイトクロームP450は薬物の代謝と解毒に不可欠なメタロ酵素である.
- 活性部位への基板アクセスのメカニズムは,特に閉じた結晶構造を考慮して,不明のままです.
研究 の 目的:
- サイトクロームP450の構造的異質性により,基質へのアクセス経路が変化するかどうかを調べる.
- シトクロームP450の触媒中心への基板の侵入のメカニズムを解明する.
主な方法:
- 原子学的分子ダイナミクスシミュレーション (数マイクロ秒)
- P450camとの自発的な基板関連性の分析
- マルコフ状態モデリングと自由エネルギー分析
主要な成果:
- P450camにおける基質の認識は,単一の,よく定義された支配的な経路によって行われる.
- 基板結合には,キー表面チャネルと基板誘発のサイドチェーンが含まれる.
- 触媒センターへのアクセスは,大規模なタンパク質開口を必要としません.
結論:
- サイトクロームP450基板の認識は基板誘発の構造的再配置によって引き起こされる.
- サイトクロームP450の基質へのアクセスに関する包括的なモデルが確立され,以前の発見を調和させています.
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