The PtdIns3-phosphatase MTMR3 interacts with mTORC1 and suppresses its activity.

The PtdIns3-phosphatase MTMR3 interacts with mTORC1 and suppresses its activity.
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DOI:
10.1002/1873-3468.12048
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发表时间:
2016-01
期刊:
影响因子:
3.5
通讯作者:
Noda, Takeshi
Noda, Takeshi
中科院分区:
生物学3区
文献类型:
--
作者:
Hao, Feike;Itoh, Takashi;Morita, Eiji;Shirahama-Noda, Kanae;Yoshimori, Tamotsu;Noda, Takeshi

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巨自噬是一种主要的细胞内降解系统。我们之前报道过磷酸酶缺陷的 MTMR3(肌管蛋白磷脂酰肌醇 (PI) 3-磷酸酶家族的成员)的过度表达会导致自噬的诱导。在这项研究中,我们发现 MTMR3 与 mTORC1 相互作用,mTORC1 是一种进化上保守的丝氨酸/苏氨酸激酶复合物,可调节细胞生长和自噬以响应环境刺激。此外,MTMR3 的过度表达抑制 mTORC1 活性。 MTMR3 的 N 端一半,包括 PH-G 和磷酸酶结构域,对于这些作用是必要且充分的。磷酸酶缺陷的 MTMR3 比野生型 MTMR3 更能抑制 mTORC1 活性。此外,磷酸酶缺陷的全长 MTMR3 和磷酸酶结构域单独定位于高尔基体。这些结果表明 mTORC1 与 PI3P 相关的新调控机制。
Macroautophagy is a major intracellular degradation system. We previously reported that overexpression of phosphatase‐deficient MTMR3, a member of the myotubularin phosphatidylinositol (PI) 3‐phosphatase family, leads to induction of autophagy. In this study, we found that MTMR3 interacted with mTORC1, an evolutionarily conserved serine/threonine kinase complex, which regulates cell growth and autophagy in response to environmental stimuli. Furthermore, overexpression of MTMR3 inhibited mTORC1 activity. The N‐terminal half of MTMR3, including the PH‐G and phosphatase domains, was necessary and sufficient for these effects. Phosphatase‐deficient MTMR3 provided more robust suppression of mTORC1 activity than wild‐type MTMR3. Furthermore, phosphatase‐deficient full length MTMR3 and the phosphatase domain alone were localized to the Golgi. These results suggest a new regulatory mechanism of mTORC1 in association with PI3P.
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