Two MAPK-signaling pathways are required for mitophagy in Saccharomyces cerevisiae.

Two MAPK-signaling pathways are required for mitophagy in Saccharomyces cerevisiae.
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DOI:
10.1083/jcb.201102092
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发表时间:
2011-05-16
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Klionsky DJ
Klionsky DJ
中科院分区:
其他
文献类型:
--
作者:
Mao K;Wang K;Zhao M;Xu T;Klionsky DJ

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MAP激酶Slt2在有丝分裂和自噬中都是必需的,而MAP激酶Hog1只在有丝分裂中起作用。巨噬(以下简称自噬)是一种在真核细胞中介导长寿命蛋白质和细胞器降解的分解代谢途径。通过自噬调节线粒体降解在细胞器的维持和质量控制中起着至关重要的作用。与我们对线粒体在细胞代谢的许多方面的基本功能(如能量产生)和功能失调的线粒体在细胞死亡中的作用的了解相比,我们对它们的降解知之甚少,特别是上游信号通路如何控制这一过程。在这里,我们报道了两种丝裂原活化蛋白激酶(MAPKs), Slt2和Hog1,在酿酒酵母中是丝裂原自噬所必需的。Slt2是线粒体和过氧化物酶体降解所必需的(通过线粒体自噬),而Hog1仅在线粒体自噬中起作用。Slt2还影响线粒体在吞噬体组装位点(吞噬体组装位点)的招募,这是包装货物进行选择性降解的关键步骤。
The MAP kinase Slt2 is required for both mitophagy and pexophagy, whereas the MAP kinase Hog1 acts specifically in mitophagy. Macroautophagy (hereafter referred to simply as autophagy) is a catabolic pathway that mediates the degradation of long-lived proteins and organelles in eukaryotic cells. The regulation of mitochondrial degradation through autophagy plays an essential role in the maintenance and quality control of this organelle. Compared with our understanding of the essential function of mitochondria in many aspects of cellular metabolism such as energy production and of the role of dysfunctional mitochondria in cell death, little is known regarding their degradation and especially how upstream signaling pathways control this process. Here, we report that two mitogen-activated protein kinases (MAPKs), Slt2 and Hog1, are required for mitophagy in Saccharomyces cerevisiae. Slt2 is required for the degradation of both mitochondria and peroxisomes (via pexophagy), whereas Hog1 functions specifically in mitophagy. Slt2 also affects the recruitment of mitochondria to the phagophore assembly site (PAS), a critical step in the packaging of cargo for selective degradation.
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