PKD is a kinase of Vps34 that mediates ROS-induced autophagy downstream of DAPk.

PKD is a kinase of Vps34 that mediates ROS-induced autophagy downstream of DAPk.
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DOI:
10.1038/cdd.2011.149
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发表时间:
2012-05
影响因子:
12.4
通讯作者:
--
中科院分区:
生物学1区
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--
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自噬是一种细胞成分被吞噬并降解于双膜囊泡(称为自噬体)中的过程,在氧化损伤的应答中具有重要作用。在这里,我们确定了一种新的级联磷酸化事件,涉及蛋白质和脂质激酶的网络,作为调节氧化应激下诱导自噬的信号通路的重要组成部分。我们的研究结果表明,无论是肿瘤抑制死亡相关蛋白激酶(DAPk)和蛋白激酶D(PKD),我们以前被磷酸化,因此激活的DAPk,介导诱导自噬反应氧化损伤。此外,我们将PKD在自噬网络中的位置映射到Vps 34,Vps 34是一种脂质激酶,其功能对于自噬是必不可少的,并证明PKD与Vps 34在相同的分子复合物中被发现。PKD使Vps 34磷酸化,导致Vps 34活化、磷酸二肌醇-3-磷酸(PI(3)P)形成和自噬体形成。与其作为自噬机制的新诱导剂的鉴定一致,我们表明PKD被招募到LC 3阳性自噬体,在那里它特异性地定位于自噬体膜。总之,我们的研究结果描述PKD作为一种新的Vps 34激酶,作为氧化应激下的自噬效应器。
Autophagy, a process in which cellular components are engulfed and degraded within double-membrane vesicles termed autophagosomes, has an important role in the response to oxidative damage. Here we identify a novel cascade of phosphorylation events, involving a network of protein and lipid kinases, as crucial components of the signaling pathways that regulate the induction of autophagy under oxidative stress. Our findings show that both the tumor-suppressor death-associated protein kinase (DAPk) and protein kinase D (PKD), which we previously showed to be phosphorylated and consequently activated by DAPk, mediate the induction of autophagy in response to oxidative damage. Furthermore, we map the position of PKD within the autophagic network to Vps34, a lipid kinase whose function is indispensable for autophagy, and demonstrate that PKD is found in the same molecular complex with Vps34. PKD phosphorylates Vps34, leading to activation of Vps34, phosphatydilinositol-3-phosphate (PI(3)P) formation, and autophagosome formation. Consistent with its identification as a novel inducer of the autophagic machinery, we show that PKD is recruited to LC3-positive autophagosomes, where it localizes specifically to the autophagosomal membranes. Taken together, our results describe PKD as a novel Vps34 kinase that functions as an effecter of autophagy under oxidative stress.
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