Copper induces cell death by targeting lipoylated TCA cycle proteins.

Copper induces cell death by targeting lipoylated TCA cycle proteins.
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铜通过靶向脂酰化TCA循环蛋白诱导细胞死亡。

DOI:
10.1126/science.abf0529
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发表时间:
2022-03-18
期刊:
影响因子:
56.9
通讯作者:
Golub, Todd R.
Golub, Todd R.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Tsvetkov, Peter;Coy, Shannon;Petrova, Boryana;Dreishpoon, Margaret;Verma, Ana;Abdusamad, Mai;Rossen, Jordan;Joesch-Cohen, Lena;Humeidi, Ranad;Spangler, Ryan D.;Eaton, John K.;Frenkel, Evgeni;Kocak, Mustafa;Corsello, Steven M.;Lutsenko, Svetlana;Kanarek, Naama;Santagata, Sandro;Golub, Todd R.

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铜是所有生物体的重要辅助因子,但如果浓度超过进化保守的稳态机制所维持的阈值,它就会变得有毒。然而,过量的铜如何诱导细胞死亡尚不清楚。在这里,我们在人类细胞中表明,铜依赖性,调节性细胞死亡与已知的死亡机制不同,并且依赖于线粒体呼吸。我们表明,铜依赖性死亡发生通过直接结合铜的三羧酸(TCA)循环的脂酰化成分。这导致脂酰化蛋白质聚集和随后的铁-硫簇蛋白损失,导致蛋白毒性应激和最终细胞死亡。这些发现可以解释古代铜稳态机制的必要性。铜诱导的细胞死亡受到线粒体铁氧还蛋白1介导的蛋白质脂酰化的调节。
Copper is an essential co-factor for all organisms, and yet it becomes toxic if concentrations exceed a threshold maintained by evolutionarily conserved homeostatic mechanisms. How excess copper induces cell death, however, is unknown. Here, we show in human cells that copper-dependent, regulated cell death is distinct from known death mechanisms, and is dependent on mitochondrial respiration. We show that copper-dependent death occurs via direct binding of copper to lipoylated components of the tricarboxylic acid (TCA) cycle. This results in lipoylated protein aggregation and subsequent iron-sulfur cluster protein loss leading to proteotoxic stress and ultimately cell death. These findings may explain the need for ancient copper homeostatic mechanisms. Copper-induced cell death is regulated by mitochondrial ferredoxin 1-mediated protein lipoylation.
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