エアロビックCODHのMo/CuコファクターのW/Cu合成モデルは,生化学的なCO酸化には,挫折したルイス酸/塩基ペアが必要であることを示しています
Dibbendu Ghosh1, Soumen Sinhababu1, Bernard D Santarsiero2
1Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607, United States.
Journal of the American Chemical Society
|June 30, 2020
まとめ
研究者たちは,一酸化炭素脱水素酵素 (CODH) の合成模倣であるW/Cu複合体を作りました. この突破はCO酸化メカニズムに洞察を与え,新しいエネルギー貯蔵触媒の開発を導くことができます.
科学分野:
- バイオ有機化学
- 有機金属化学
- 生物化学
背景:
- エアロビック一酸化炭素脱水素酶 (CODH) の活性部位は,大気中のCOとCO2の調節に不可欠である.
- CODHにおけるMo/Cu活性部位の正確なモデルを合成することは大きな課題でした.
- CODHの機能を理解することは,化学的自給性細菌と古生物を含む世界の炭素循環にとって不可欠です.
研究 の 目的:
- エアロビック一酸化炭素脱水素酶 (CODH) のMo/Cu活性部位を模倣した合成モデルを構築する.
- バイオケミカルなCO酸化過程について機械的な洞察を得るために.
- エネルギー貯蔵のための将来の多金属触媒の設計にインパクトを与える.
主な方法:
- 複合体を合成するためにシリル保護/脱保護戦略が採用されました.
- bdt (O) WVIとCuI (NHC) サイト間の混合O2-/S2-結合を持つW/Cu複合体が構築された.
- 合成複合体の構造と電子的特徴を分析し,ネイティブのCODHコファクターと比較した.
主要な成果:
- W/Cu複合体は合成され,これまでのところCODH活性部位に最も近い合成模倣物の1つである.
- 合成複合体とネイティブのCODHコファクターの構造と電子的な特徴の違いが特定されました.
- 発見は,生来のCODH活性部位は,生化学的なCO酸化のために,タンパク質二次構造によって強制された,ストレートな幾何学とルイス酸/塩基の挫折を必要とすることを示唆している.
結論:
- この研究は,CODH活性部位をよく模倣する新しいW/Cu複合体を示しています.
- メカニズム的な洞察は,固有の酵素の機能における緊張した活性部位とタンパク質誘発の挫折の重要性を示唆する.
- この研究は,エネルギー貯蔵のための高度な合成触媒の開発を導くことができます.
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