タンパク質におけるZn結合ヒスティジンのプロトネーション状態を制御する要因:DFT/CDM研究
1Institute of Biomedical Science, Academic Sinica, Taipei 11529, Taiwan ROC.
Journal of the American Chemical Society
|February 26, 2004
まとめ
ジンク結合部位におけるヒスティジンの陽子化状態は,溶媒のアクセシビリティとジンクに依存する.
科学分野:
- バイオケミストリー バイオケミストリー
- コンピューティング・ケミストリー
- 構造生物学 構造生物学とは
背景:
- ヒスティジンのプロトネーション状態は,酵素の機能に極めて重要です.
- 亜鉛結合サイトには,しばしばHis-Asp/Gluトライアードがある.
- これらの部位を理解することは,酵素機構の解明の鍵です.
研究 の 目的:
- Zn結合部位におけるHis陽子化に影響を与える要因を調査する.
- 陽子の移転における第2殻リガンドの役割を決定する.
- Zn-His-Asp/GluトライアードのZn結合水への影響を評価する.
主な方法:
- 量子力学と連続体介電学的計算を組み合わせた.
- Zn結合イミダゾール/水のデプロトン化のための計算された自由エネルギー.
- 様々なZn複合モデルを分析した.
主要な成果:
- プロトネーション状態は,金属結合部位の溶媒アクセシビリティとZn Lewis酸性によって支配されます.
- 骨幹カルボニルを含む第2殻リガンドは,陽子を受容することができる.
- トライアードのAsp/Gluは,埋もれた穴のカチオンを安定させることができます.
結論:
- Zn-Hのプロトネーションは,マイクロ環境に対して敏感である.
- セカンドシェルの相互作用は,金属のサイト特性を調節する上で重要な役割を果たします.
- 発見は,金属酵素における実験的観測と一致しています.
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