Mitochondrial and nuclear accumulation of the transcription factor ATFS-1 promotes OXPHOS recovery during the UPR(mt).

Mitochondrial and nuclear accumulation of the transcription factor ATFS-1 promotes OXPHOS recovery during the UPR(mt).
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DOI:
10.1016/j.molcel.2015.02.008
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发表时间:
2015-04-02
期刊:
影响因子:
16
通讯作者:
Haynes, Cole M.
Haynes, Cole M.
中科院分区:
生物学1区
文献类型:
--
作者:
Nargund, Amrita M.;Fiorese, Christopher J.;Pellegrino, Mark W.;Deng, Pan;Haynes, Cole M.

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线粒体疾病和衰老与氧化磷酸化机制(OXPHOS)的缺陷有关,OXPHOS是由不同基因组编码的蛋白质组成的唯一复合体。为了更好地了解线粒体功能障碍时的基因组协调和OXPHOS恢复,我们通过芯片测序检测了ATFS-1,这是一种转录因子,在线粒体UPR过程中调节线粒体到核的通讯。令人惊讶的是,除了调控线粒体伴侣、OXPHOS复合体组装因子和糖酵解基因外,ATFS-1还直接与核和线粒体基因组中的OXPHOS基因启动子结合。有趣的是,在线粒体应激过程中,ATFS-1被要求限制OXPHOS转录本的积累,这需要ATFS-1在细胞核和线粒体中积累。由于ATFS-1的平衡积累促进了OXPHOS复合体的组装和功能,我们的数据表明,ATFS-1通过微调OXPHOS的表达来刺激呼吸恢复,以匹配应激线粒体中次优蛋白质折叠环境的能力,同时增加蛋白稳定能力。
Mitochondrial diseases and aging are associated with defects in the oxidative phosphorylation machinery (OXPHOS), which are the only complexes composed of proteins encoded by separate genomes. To better understand genome coordination and OXPHOS recovery during mitochondrial dysfunction, we examined ATFS-1, a transcription factor that regulates mitochondria-to-nuclear communication during the mitochondrial UPR, via ChIP-sequencing. Surprisingly, in addition to regulating mitochondrial chaperone, OXPHOS complex assembly factor, and glycolysis genes, ATFS-1 bound directly to OXPHOS gene promoters in both the nuclear and mitochondrial genomes. Interestingly, atfs-1 was required to limit the accumulation of OXPHOS transcripts during mitochondrial stress, which required accumulation of ATFS-1 in the nucleus and mitochondria. Because balanced ATFS-1 accumulation promoted OXPHOS complex assembly and function, our data suggest that ATFS-1 stimulates respiratory recovery by fine-tuning OXPHOS expression to match the capacity of the suboptimal protein-folding environment in stressed mitochondria, while simultaneously increasing proteostasis capacity.
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