K63 polyubiquitination and activation of mTOR by the p62-TRAF6 complex in nutrient-activated cells.

K63 polyubiquitination and activation of mTOR by the p62-TRAF6 complex in nutrient-activated cells.
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DOI:
10.1016/j.molcel.2013.06.020
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发表时间:
2013-08-08
期刊:
影响因子:
16
通讯作者:
Diaz-Meco, Maria T.
Diaz-Meco, Maria T.
中科院分区:
生物学1区
文献类型:
--
作者:
Linares, Juan F.;Duran, Angeles;Yajima, Tomoko;Pasparakis, Manolis;Moscat, Jorge;Diaz-Meco, Maria T.

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细胞对营养物质可用性变化的反应能力对于代谢稳态的充分控制至关重要。哺乳动物雷帕霉素靶蛋白复合物1 (mTORC1)是这些过程中的一个中心复合物激酶。信号适配器p62结合猛禽,是mTORC1通路的组成部分。p62与TNF受体相关因子6 (TRAF6)相互作用,是mTORC1易位到溶酶体及其随后激活所必需的。本研究表明,在氨基酸刺激的细胞中,TRAF6通过p62被募集到mTORC1并激活mTORC1。我们还发现TRAF6对于mTORC1转运到溶酶体是必要的,并且TRAF6催化的mTOR的K63泛素化通过氨基酸调节mTORC1的激活。TRAF6通过与p62的相互作用和mTORC1的激活,调节自噬,是癌细胞增殖的重要介质。干扰p62-TRAF6相互作用有助于调节自噬和营养感知。
The ability of cells to respond to changes in nutrient availability is critical for an adequate control of metabolic homeostasis. Mammalian target of rapamycin complex 1 (mTORC1) is a central complex kinase in these processes. The signaling adaptor p62 binds raptor, and integral component of the mTORC1 pathway. p62 interacts with TNF receptor associated factor 6 (TRAF6) and is required for mTORC1 translocation to the lysosome and its subsequent activation. Here we show that TRAF6 is recruited to and activates mTORC1 through p62 in amino acid-stimulated cells. We also show that TRAF6 is necessary for the translocation of mTORC1 to the lysosomes and that the TRAF6-catalyzed K63 ubiquitination of mTOR regulates mTORC1 activation by amino acids. TRAF6, through its interaction with p62 and activation of mTORC1, modulates autophagy and is an important mediator in cancer cell proliferation. Interfering with the p62-TRAF6 interaction serves to modulate autophagy and nutrient sensing.
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