[4Fe-4S]ミトコンドリアのクラスター組成と銅による損傷

Diego Brancaccio¹, Angelo Gallo^2,3, Mario Piccioli^2,3

¹Department of Pharmacy, University of Naples "Federico II" , Via D. Montesano 49, 80131 Napoli, Italy.

Journal of the American Chemical Society

|December 20, 2016

まとめ

銅の毒性により,ミトコンドリアの鉄硫黄 (Fe/S) タンパク質の成熟が妨げられ, [4Fe-4S] クラスタの組み立てが妨げられる. 細胞の損傷を防ぐには銅とFe/S経路の厳格な規制が不可欠です

科学分野:

ミトコンドリア生物学
細胞毒性学
生物化学

背景:

銅の毒性は反応性酸素種と,細菌では鉄硫黄 (Fe/S) クラスタータンパク質と関連している.
ミトコンドリアには銅のプールとFe/Sクラスタの組み立て装置があり,潜在的な相互作用を示唆しています.
銅のホメオスタシスの誤調はミトコンドリアのFe/Sタンパク質の成熟を損なう可能性があります.

研究の目的:

銅の毒性がミトコンドリア [4Fe-4S] クラスター形成に影響を与える分子メカニズムを解明する.
ミトコンドリアのFe/Sクラスター生物生成におけるISCA1/ISCA2およびGLRX5タンパク質の役割を調査する.
銅のイオンがこの熟成過程にどのように干渉するかを定義する.

主な方法:

ISCA1/ISCA2とGLRX5を含む [4Fe-4S]クラスター形成のメカニズムを調査した.
ミトコンドリアのFe/Sタンパク質成熟経路に対する銅の影響を分析した.
銅の干渉の分子モデルを提案した.

主要な成果:

ミトコンドリアの Fe/S クラスター組立に対する銅の毒性の特定の分子メカニズムを特定した.
銅がミトコンドリアのFe/Sタンパク質の成熟を直接阻害することが示された.
この過程でISCA1/ISCA2とGLRX5の役割を確立した.

結論:

銅イオンはミトコンドリアの [4Fe-4S] タンパク質の成熟を阻害する.
銅のホメオスタシスとFe/Sタンパク質の組み立て経路の両方の厳格な規制は不可欠です.
この調節により,銅がミトコンドリアの重要な機能を妨害することを防ぐ.

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