Autophagy requires endoplasmic reticulum targeting of the PI3-kinase complex via Atg14L.

Autophagy requires endoplasmic reticulum targeting of the PI3-kinase complex via Atg14L.
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DOI:
10.1083/jcb.200911141
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发表时间:
2010-08-23
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Yoshimori T
Yoshimori T
中科院分区:
其他
文献类型:
--
作者:
Matsunaga K;Morita E;Saitoh T;Akira S;Ktistakis NT;Izumi T;Noda T;Yoshimori T

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在通常PI3P缺陷的ER膜中产生PI3P使细胞器成为自噬体形成的平台。自噬是一种分解代谢过程,允许细胞通过自噬体形成和溶酶体降解来消化其细胞质成分。最近,自噬特异性磷脂酰肌醇3-激酶(PI3-激酶)复合物,由hVps34,hVps15,Beclin-1,和Atg14 L,已被确定在哺乳动物细胞。Atg14 L对这种自噬复合物具有特异性,并定位于内质网(ER)。Atg14 L的敲除导致DFCP 1阳性omegasome的消失,该omegasome是与自噬体和ER密切相关的膜结构。Atg14L的点突变导致ER定位缺陷,也导致自噬诱导缺陷。将DFCP1的ER靶向基序添加到该突变体中完全补充了Atg14L敲除胚胎干细胞中的自噬缺陷。因此,Atg14 L募集III类PI3-激酶的一个子集到ER,否则磷脂酰肌醇3-磷酸(PI3P)基本上不存在。内质网中PI3P的Atg14L依赖性外观使该细胞器成为自噬体形成的平台。
Generation of PI3P in the normally PI3P-deficient ER membrane makes the organelle a platform for autophagosome formation. Autophagy is a catabolic process that allows cells to digest their cytoplasmic constituents via autophagosome formation and lysosomal degradation. Recently, an autophagy-specific phosphatidylinositol 3-kinase (PI3-kinase) complex, consisting of hVps34, hVps15, Beclin-1, and Atg14L, has been identified in mammalian cells. Atg14L is specific to this autophagy complex and localizes to the endoplasmic reticulum (ER). Knockdown of Atg14L leads to the disappearance of the DFCP1-positive omegasome, which is a membranous structure closely associated with both the autophagosome and the ER. A point mutation in Atg14L resulting in defective ER localization was also defective in the induction of autophagy. The addition of the ER-targeting motif of DFCP1 to this mutant fully complemented the autophagic defect in Atg14L knockout embryonic stem cells. Thus, Atg14L recruits a subset of class III PI3-kinase to the ER, where otherwise phosphatidylinositol 3-phosphate (PI3P) is essentially absent. The Atg14L-dependent appearance of PI3P in the ER makes this organelle the platform for autophagosome formation.
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