首页> 外文期刊>Molecular and Cellular Biology >Metabolic-Stress-Induced Rearrangement of the 14-3-3ζ Interactome Promotes Autophagy via a ULK1- and AMPK-Regulated 14-3-3ζ Interaction with Phosphorylated Atg9
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Metabolic-Stress-Induced Rearrangement of the 14-3-3ζ Interactome Promotes Autophagy via a ULK1- and AMPK-Regulated 14-3-3ζ Interaction with Phosphorylated Atg9

机译:代谢应激诱导的14-3-3ζ相互作用组的重排通过磷酸化Atg9的ULK1和AMPK调控的14-3-3ζ相互作用促进自噬。

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14-3-3ζ promotes cell survival via dynamic interactions with a vast network of binding partners, many of which are involved in stress regulation. We show here that hypoxia (low glucose and oxygen) triggers a rearrangement of the 14-3-3ζ interactome to favor an interaction with the core autophagy regulator Atg9A. Our data suggest that the localization of mammalian Atg9A to autophagosomes requires phosphorylation on the C terminus of Atg9A at S761, which creates a 14-3-3ζ docking site. Under basal conditions, this phosphorylation is maintained at a low level and is dependent on both ULK1 and AMPK. However, upon induction of hypoxic stress, activated AMPK bypasses the requirement for ULK1 and mediates S761 phosphorylation directly, resulting in an increase in 14-3-3ζ interactions, recruitment of Atg9A to LC3-positive autophagosomes, and enhanced autophagosome production. These data suggest a novel mechanism whereby the level of autophagy induction can be modulated by AMPK/ULK1-mediated phosphorylation of mammalian Atg9A.
机译:14-3-3ζ通过与大量结合伴侣网络的动态相互作用来促进细胞存活,其中许多结合伴侣都参与了压力调节。我们在这里显示缺氧(低葡萄糖和氧气)触发14-3-3ζ相互作用组的重排,以促进与核心自噬调节剂Atg9A的相互作用。我们的数据表明,哺乳动物Atg9A定位于自噬体需要在Atg9A的C末端在S761进行磷酸化,从而形成14-3-3ζ停靠位点。在基础条件下,该磷酸化水平维持在较低水平,并且依赖于ULK1和AMPK。但是,在诱导缺氧应激后,活化的AMPK绕过了ULK1的要求,直接介导了S761的磷酸化,导致14-3-3ζ相互作用增加,Atg9A募集到LC3阳性自噬体,并增强了自噬体的产生。这些数据表明一种新的机制,由此可以通过AMPK / ULK1介导的哺乳动物Atg9A磷酸化来调节自噬诱导的水平。

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