Differential regulation of distinct Vps34 complexes by AMPK in nutrient stress and autophagy.

Differential regulation of distinct Vps34 complexes by AMPK in nutrient stress and autophagy.
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DOI:
10.1016/j.cell.2012.12.016
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发表时间:
2013-01-17
期刊:
影响因子:
64.5
通讯作者:
Guan KL
Guan KL
中科院分区:
生物学1区
文献类型:
--
作者:
Kim J;Kim YC;Fang C;Russell RC;Kim JH;Fan W;Liu R;Zhong Q;Guan KL

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自噬是一种应激反应,保护细胞免受不利条件,如营养缺乏。III类磷脂酰肌醇-3激酶Vps34形成多种复合物,调节细胞内囊泡运输和自噬诱导。在这里,我们发现AMPK在调节不同的Vps34复合物中起关键作用。AMPK通过磷酸化Vps34中的T163/S165抑制非自噬Vps34复合物,从而抑制整体PI(3)P的产生并保护细胞免于饥饿。与此同时,AMPK通过磷酸化Beclin1中的S91/S94来激活促自噬的Vps34复合体,诱导自噬。Atg14L是一个自噬必需基因,只存在于促自噬的Vps34复合体中,抑制Vps34的磷酸化,但增加AMPK对Beclin1的磷酸化。因此,Atg14L决定了不同Vps34复合物在葡萄糖饥饿反应中的差异调节(抑制或激活)。我们的研究揭示了AMPK对Vps34复合物在营养应激反应和自噬中的复杂分子调控。
Autophagy is a stress response protecting cells from unfavorable conditions, such as nutrient starvation. The class III phosphatidylinositol-3 kinase, Vps34, forms multiple complexes and regulates both intracellular vesicle trafficking and autophagy induction. Here, we show that AMPK plays a key role in regulating different Vps34 complexes. AMPK inhibits the non-autophagy Vps34 complex by phosphorylating T163/S165 in Vps34, therefore suppresses overall PI(3)P production and protects cells from starvation. In parallel, AMPK activates the pro-autophagy Vps34 complex by phosphorylating S91/S94 in Beclin1 to induce autophagy. Atg14L, an autophagy essential gene present only in pro-autophagy Vps 34 complex, inhibits Vps34 phosphorylation but increases Beclin1 phosphorylation by AMPK. As such, Atg14L dictates the differential regulation (either inhibition or activation) of different Vps34 complexes in response to glucose starvation. Our study reveals an intricate molecular regulation of Vps34 complexes by AMPK in nutrient stress response and autophagy.
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