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分子シミュレーション情報型タンパク質工学によるToHydAのH₂生産活動の調整

Chandan K Das^1,2, Subhasri Ghosh³, Shuvankar Naskar³

¹Center for Theoretical Chemistry, Ruhr University Bochum, Universitätsstr. 150, 44801 Bochum, Germany.

|February 14, 2026

まとめ

研究者らは,バイオ水素生成のための酸素安定 [FeFe]-ヒドロゲナーゼに含まれるユニークなシステイン残基を調査した. この残留物を変異させることで,酵素の安定性を維持しながら,水素生成の活性が強化された.

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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
バイオエネルギー学バイオエネルギー学

背景:

*Thermosediminibacter oceani* (ToHydA) の酸素に安定したグループB [FeFe]-ヒドロゲンゼは,バイオ水素生成に不可欠である.
その活性部位は,グループAヒドロゲナーゼ (TSCCP) に比べて,追加のシステインを含むユニークなTSCCCPモチーフを特徴としています.
水素生成におけるこの追加のシステインの機能的意義は不明である.

研究の目的:

ToHydA.のTSCCCPモチーフにおける追加のシステイン残基の役割を明らかにする.
水素 (H2) 生産と酸素 (O2) の安定性への影響を理解するために.
この酵素の機能的動態に関する洞察を提供するために.

主な方法:

分子動力学 (MD) シミュレーションは,酵素の行動をモデル化するために使用されました.
サイト指向型変異は,特定の変異種,特にシステイン-セリン交換 (TSSCCP) を作成するために使用されました.
酵素の活性と構造を分析するために,生化学的測定とフーリエ変換赤外線 (FTIR) スペクトロスコーピーを実施した.

主要な成果:

システインからセリンへの変種 (TSSCCP) は,H2の生産を大幅に増加させた.
この変異により,ToHydA酵素のO2安定性は損なわれませんでした.
この研究は,酵素の機能的動態に関する新しい情報を明らかにした.

結論:

ToHydAの活性部位にある追加のシステイン残基は,H2の産生を調節する上で重要な役割を果たします.
この残基を修正すると,安定性を犠牲にすることなく,ヒドロゲンアースの活性が向上します.
これらの発見は,バイオ水素生産技術の最適化のための潜在的な戦略を提供します.