NRBF2 regulates autophagy and prevents liver injury by modulating Atg14L-linked phosphatidylinositol-3 kinase III activity.

NRBF2 regulates autophagy and prevents liver injury by modulating Atg14L-linked phosphatidylinositol-3 kinase III activity.
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DOI:
10.1038/ncomms4920
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发表时间:
2014-05-22
影响因子:
16.6
通讯作者:
Yue, Zhenyu
Yue, Zhenyu
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Lu, Jiahong;He, Liqiang;Behrends, Christian;Araki, Masatake;Araki, Kimi;Wang, Qing Jun;Catanzaro, Joseph M.;Friedman, Scott L.;Zong, Wei-Xing;Fiel, M. Isabel;Li, Min;Yue, Zhenyu

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The Beclin 1-Vps34 complex, the core component of the class III phosphatidylinositol-3 kinase (PI3K-III), binds Atg14L or UVRAG to control different steps of autophagy. However, the mechanism underlying the control of PI3K-III activity remains elusive. Here we report the identification of NRBF2 as a component in the specific PI3K-III complex and a modulator of PI3K-III activity. Through its MIT domain, NRBF2 binds Atg14L directly and enhances Atg14L-linked Vps34 kinase activity and autophagy induction. NRBF2 deficient cells exhibit enhanced vulnerability to ER stress that is reversed by re-introducing exogenous NRBF2. NRBF2 deficient mice develop focal liver necrosis and ductular reaction, accompanied by impaired Atg14L-linked Vps34 activity and autophagy, though the mice show no increased mortality. Our data reveals a key role for NRBF2 in the assembly of the specific Atg14L-Beclin 1-Vps34-Vps15 complex for autophagy induction. Thus, NRBF2 modulates autophagy via regulation of PI3K-III and prevents ER stress-mediated cytotoxicity and liver injury.
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