銅ペプチド複合体の構造と反応性は,保存されたHis-X(aa) -His配列で見つかったときです
Ga Young Park1, Jung Yoon Lee, Richard A Himes
1Department of Chemistry, The Johns Hopkins University , Baltimore, Maryland 21218, United States.
Journal of the American Chemical Society
|August 30, 2014
まとめ
ヒスティジンを含む銅タンパク質におけるタウトメア偏好は,銅を著しく変化させる.
科学分野:
- バイオ・オーガニック化学 バイオ・オーガニック化学
- 協調化化学について
- タンパク質化学 タンパク質化学
背景:
- 酸素活性化銅タンパク質には,しばしばHis-X(aa) -Hisケラートモチーフが特徴です.
- これらのタンパク質のイミダゾール環は,タウトメリック形態 (δN vs. εN) で存在し,銅イオン相互作用に影響を与えます.
研究 の 目的:
- ヒスティジンの残留物の δN 対 εN タウトメア偏好が,銅イオン協調,酸化還元特性,および反応性にどのように影響するかを調査する.
- 銅 (((I) 複合体を δ-HGH と ε-HGH トリペプチドで合成し,特徴づけること.
主な方法:
- X線吸収スペクトロスコーピーは,X線吸収スペクトロスコーピーを用います.
- 密度関数理論による計算
- 溶液の導電性測定について
- 銅 ((I) 複合体の合成と特徴づけ
主要な成果:
- δ-HGHはCu(I) ダイマー複合体 [{Cu(I) │δ-HGH) }2](2+) を形成し, ε-HGHはモノメア複合体 [Cu(I) │ε-HGH) │+) を形成した.
- モノメア複合体[Cu(I)(ε-HGH) ](+) は反応性を示し,銅単酸化酵素PHM.に似たCOアダクトを形成した.
- この複合体はまた,O2およびH2O2と反応し,新しいO2添加物またはCu (II) -OOH複合体を形成しました.
結論:
- ヒスティジンのタウトメア偏好は,生物無機系における銅の協調幾何学と反応性を決定的に影響する.
- ε-HGH-Cu(I) コンプレックスは,銅モノオキシゲナーゼの機能モデルとして機能し,特定の調整環境の重要性を強調しています.
- この研究は,銅に依存した酸素活性化と酸化反応のメカニズムについての洞察を提供します.
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