TBC1D14 regulates autophagosome formation via Rab11- and ULK1-positive recycling endosomes.

TBC1D14 regulates autophagosome formation via Rab11- and ULK1-positive recycling endosomes.
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DOI:
10.1083/jcb.201111079
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发表时间:
2012-05-28
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Tooze SA
Tooze SA
中科院分区:
其他
文献类型:
--
作者:
Longatti A;Lamb CA;Razi M;Yoshimura S;Barr FA;Tooze SA

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非催化性RabGAP蛋白TBC 1D 14调节饥饿时自噬体形成所需的Rab 11和ULK 1阳性再循环内体自噬是一种大量降解过程,其特征在于形成称为自噬体的双膜囊泡。自噬体形成的确切分子机制和自噬体膜的起源仍不清楚。我们筛选了38个人Tre-2/Bub 2/Cdc 16结构域的Rab鸟苷三磷酸酶激活蛋白(GAP),并确定了11个饥饿诱导的自噬负调节因子。这些推定的RabGAP之一TBC 1D 14与自噬激酶ULK 1共定位并相互作用。过表达的TBC 1D 14使ULK 1阳性再循环内体(RE)微管化,损害其功能并抑制自噬体形成。TBC 1D 14结合活化的Rab 11,但不是Rab 11的GAP,Rab 11的缺失阻止TBC 1D 14诱导的RE的微管化。此外,Rab 11是自噬体形成所必需的。ULK 1和Atg 9在Rab 11和转铁蛋白(Tfn)受体(TfnR)阳性再循环内体上发现。氨基酸饥饿导致TBC 1D 14从RE重新定位到高尔基复合体,而TfnR和Tfn定位于形成ULK 1和LC 3阳性的自噬体。因此,TBC 1D 14-和Rab 11-依赖的囊泡运输从RE有助于和调节饥饿诱导的自噬。
The noncatalytic RabGAP protein TBC1D14 regulates the Rab11- and ULK1-positive recycling endosomes required for autophagosome formation upon starvation Autophagy is a bulk degradation process characterized by the formation of double membrane vesicles called autophagosomes. The exact molecular mechanism of autophagosome formation and the origin of the autophagosomal membrane remain unclear. We screened 38 human Tre-2/Bub2/Cdc16 domain–containing Rab guanosine triphosphatase–activating proteins (GAPs) and identified 11 negative regulators of starvation-induced autophagy. One of these putative RabGAPs, TBC1D14, colocalizes and interacts with the autophagy kinase ULK1. Overexpressed TBC1D14 tubulates ULK1-positive recycling endosomes (REs), impairing their function and inhibiting autophagosome formation. TBC1D14 binds activated Rab11 but is not a GAP for Rab11, and loss of Rab11 prevents TBC1D14-induced tubulation of REs. Furthermore, Rab11 is required for autophagosome formation. ULK1 and Atg9 are found on Rab11- and transferrin (Tfn) receptor (TfnR)–positive recycling endosomes. Amino acid starvation causes TBC1D14 to relocalize from REs to the Golgi complex, whereas TfnR and Tfn localize to forming autophagosomes, which are ULK1 and LC3 positive. Thus, TBC1D14- and Rab11-dependent vesicular transport from REs contributes to and regulates starvation-induced autophagy.
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