Cryptococcal Hsf3 controls intramitochondrial ROS homeostasis by regulating the respiratory process.

Cryptococcal Hsf3 controls intramitochondrial ROS homeostasis by regulating the respiratory process.
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隐球菌 Hsf3 通过调节呼吸过程来控制线粒体内 ROS 稳态

DOI:
10.1038/s41467-022-33168-1
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发表时间:
2022-09-15
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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线粒体质量控制可防止线粒体内源性活性氧(mtROS)的积累,从而保护细胞免受DNA损伤、基因组不稳定和程序性细胞死亡。然而,其潜在机制尚未完全明确,在真菌物种中尤其如此。在此,我们发现新型隐球菌热休克因子3(CnHsf3)在调控mtROS方面具有一种不依赖于未折叠蛋白反应的非典型功能。CnHsf3作用于细胞核和线粒体,其细胞器特异性功能需要核定位信号和线粒体定位信号。它抑制参与三羧酸循环的基因表达,同时促进参与电子传递链的基因表达。此外,CnHsf3对多种线粒体内应激作出反应;这种反应是由其DNA结合结构域上的半胱氨酸残基氧化所介导的,这增强了DNA结合。我们的研究结果揭示了热休克因子蛋白在调控mtROS稳态方面的一种不依赖于未折叠蛋白反应的功能。 线粒体质量控制可防止线粒体内活性氧(mtROS)的积累,从而保护细胞免受DNA损伤。在此,高等人表明一种非典型热休克因子对线粒体内应激作出反应,并调控致病性真菌新型隐球菌中的mtROS稳态。
Mitochondrial quality control prevents accumulation of intramitochondrial-derived reactive oxygen species (mtROS), thereby protecting cells against DNA damage, genome instability, and programmed cell death. However, underlying mechanisms are incompletely understood, particularly in fungal species. Here, we show that Cryptococcus neoformans heat shock factor 3 (CnHsf3) exhibits an atypical function in regulating mtROS independent of the unfolded protein response. CnHsf3 acts in nuclei and mitochondria, and nuclear- and mitochondrial-targeting signals are required for its organelle-specific functions. It represses the expression of genes involved in the tricarboxylic acid cycle while promoting expression of genes involved in electron transfer chain. In addition, CnHsf3 responds to multiple intramitochondrial stresses; this response is mediated by oxidation of the cysteine residue on its DNA binding domain, which enhances DNA binding. Our results reveal a function of HSF proteins in regulating mtROS homeostasis that is independent of the unfolded protein response. Mitochondrial quality control prevents accumulation of intramitochondrial reactive oxygen species (mtROS), thus protecting cells against DNA damage. Here, Gao et al. show that an atypical heat shock factor responds to intramitochondrial stresses and regulates mtROS homeostasis in the pathogenic fungus Cryptococcus neoformans.
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发表时间: 2020-12-16
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