Dual roles of Atg8-PE deconjugation by Atg4 in autophagy.

Dual roles of Atg8-PE deconjugation by Atg4 in autophagy.
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DOI:
10.4161/auto.19652
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发表时间:
2012-06
期刊:
影响因子:
13.3
通讯作者:
Xie Z
Xie Z
中科院分区:
生物学1区
文献类型:
--
作者:
Yu ZQ;Ni T;Hong B;Wang HY;Jiang FJ;Zou S;Chen Y;Zheng XL;Klionsky DJ;Liang Y;Xie Z

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泛素或类泛素(Ubl)蛋白对靶分子的修饰通常是可逆的。然而,人们对这种反反应的生理功能知之甚少。at8是一种独特的Ubl蛋白,其偶联靶点是脂质磷脂酰乙醇胺(PE)。at8在双膜自噬体的形成中起作用,这是保守的巨噬(以下简称自噬)细胞内降解途径的核心步骤。本研究表明,半胱氨酸蛋白酶Atg4对at8−PE的解偶联在自噬体的形成中起双重作用。在自噬体形成的早期阶段,解偶联从非自噬体膜释放Atg8以维持Atg8的适当供应。在后期,at8从中间自噬体膜释放,促进这些结构成熟为具有融合能力的自噬体。这些结果为at8−PE的功能及其解偶联提供了新的见解。
Modification of target molecules by ubiquitin or ubiquitin-like (Ubl) proteins is generally reversible. Little is known, however, about the physiological function of the reverse reaction, deconjugation. Atg8 is a unique Ubl protein whose conjugation target is the lipid phosphatidylethanolamine (PE). Atg8 functions in the formation of double-membrane autophagosomes, a central step in the well-conserved intracellular degradation pathway of macroautophagy (hereafter autophagy). Here we show that the deconjugation of Atg8−PE by the cysteine protease Atg4 plays dual roles in the formation of autophagosomes. During the early stage of autophagosome formation, deconjugation releases Atg8 from non-autophagosomal membranes to maintain a proper supply of Atg8. At a later stage, the release of Atg8 from intermediate autophagosomal membranes facilitates the maturation of these structures into fusion-capable autophagosomes. These results provide new insights into the functions of Atg8−PE and its deconjugation.
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