Interaction between FIP200 and ATG16L1 distinguishes ULK1 complex-dependent and -independent autophagy.

Interaction between FIP200 and ATG16L1 distinguishes ULK1 complex-dependent and -independent autophagy.
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DOI:
10.1038/nsmb.2475
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发表时间:
2013-02
影响因子:
16.8
通讯作者:
Jiang, Xuejun
Jiang, Xuejun
中科院分区:
生物学1区
文献类型:
--
作者:
Gammoh, Noor;Florey, Oliver;Overholtzer, Michael;Jiang, Xuejun

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自噬是一个精心安排的细胞分解代谢过程,需要多种自噬相关基因产物(ATG)。ULK1复合体的功能是通过一种未知的机制将上游信号整合到下游ATG蛋白。在这里,我们确定了哺乳动物FIP200和ATG16L1之间的相互作用,它们分别是ULK1和ATG5复合体的基本成分。进一步的分析表明,这是一种由ATG16L1的一个短域介导的直接相互作用,我们称之为FIP200结合结构域(FBD)。ATG16L1自二聚或与ATG5相互作用不需要FBD。重要的是,FBD缺失的ATG16L1突变体在介导氨基酸饥饿诱导的自噬方面存在缺陷,这需要ULK1复合体。有趣的是,该突变体保留了其支持缺糖诱导的自噬的功能,这是一个不依赖于ULK1复合体的过程。因此,我们的研究确定了ULK1和ATG5复合体之间的一种新的相互作用,它可以区分ULK1依赖和非独立的自噬过程。
Autophagy is a finely orchestrated cellular catabolic process that requires multiple autophagy-related gene products (ATG). The ULK1 complex functions to integrate upstream signals to downstream ATG proteins through an unknown mechanism. Here, we identified an interaction between mammalian FIP200 and ATG16L1, essential components of the ULK1 and ATG5 complexes, respectively. Further analyses demonstrate that this is a direct interaction mediated by a short domain of ATG16L1 which we term the FIP200-Binding Domain (FBD). The FBD is not required for ATG16L1 self-dimerization or interaction with ATG5. Importantly, FBD-deleted ATG16L1 mutant is defective in mediating amino acid starvation-induced autophagy, which requires the ULK1 complex. Intriguingly, this mutant retains its function in supporting glucose deprivation-induced autophagy, a ULK1 complex-independent process. Our study has therefore identified a novel interaction between the ULK1 and ATG5 complexes that can distinguish ULK1-dependent and -independent autophagy processes.
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