プラチナ製の抗がん剤による銅の密輸を抑制するメカニズムと構造的基礎
Alessia Lasorsa1, Maria I Nardella1, Antonio Rosato1
1Department of Chemistry , University of Bari "Aldo Moro" , via Orabona, 4 , 70125 Bari , Italy.
Journal of the American Chemical Society
|July 9, 2019
まとめ
シスプラチンのようなプラチナ製薬は,Atox1-Cu (I) -Mnk1複合体と結合することで,銅の輸送を妨害する. この相互作用は銅の恒常性を破壊し,がん細胞の生存能力と移動に影響を与えます.
科学分野:
- 生物化学
- メタロタンパク質化学
- ガン治療薬
背景:
- 銅 (Cu) はクプロエンザイム成熟,細胞増殖,血管新生に不可欠であり,輸送には特定のタンパク質の相互作用が必要です.
- 銅のシャペロンであるAtox1は,銅の調節と分泌に不可欠なATP7a/ATP7bにCu (I) を供給する.
- 銅の移転は,CxxCディチオールモチーフを使用して,Atox1とCu-ATPasesの間の一時的な3座標中間物質を含む.
研究 の 目的:
- 抗腫瘍プラチナ製薬とAtox1-Cu(I) -ATPase複合体の相互作用を調査する.
- 銅輸送タンパク質にプラチナ製薬が結合する構造的基礎と機能的結果を解明する.
主な方法:
- 溶液NMRとX線結晶学を用いたAtox1-Cu(I) -Mnk1-Pt(II) アドクトの構造的特徴.
- 異なる結合構成の安定性と反応性を評価するために変異したタンパク質を使用した.
- 金属イオン (Cu ((I)) と Zn ((II)) とプラチナ製薬同位体 (シスプラチンとトランスプラチン) が複合体形成に及ぼす影響を調査した.
主要な成果:
- シスプラチンとオクサリプラチンのアナログは,アトックス1- Cu (I) -Mnk1複合体で運動的に安定したアダクトを形成する.
- 構造分析により,特定の結合構成が明らかになり,一つはPt (II) に対して安定性が低下し,より反応性がある.
- 銅イオンはプラチナの調整部位に留まっていても,グルタチオンのような生理学的チオールに放出されます.
結論:
- プラチナ (II) 薬は特にアトックス1-Cu (I) -ATPase複合体を標的にし,安定させ,銅の恒常性を破壊する.
- 銅イオン交換への干渉は,がん細胞の生存能力と移動に影響します.
- この発見は,金属イオン取引を標的としたプラチナベースの化学療法における新しい作用機構を強調しています.
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