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Yu, Zhong-Qiu; Ni, Tao; Hong, Bing; Wang, Hai-Yan; Jiang, Fen-Jun; Zou, Shenshen; Chen, Yong; Zheng, Xi-Long; Klionsky, Daniel J.; Liang, Yongheng; Xie, Zhiping
Autophagy, 6/23/2012, Letnik: 8, Številka: 6Report
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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