PtdIns4P restriction by hydrolase SAC1 decides specific fusion of autophagosomes with lysosomes

Hongjun Zhang, Jiao Zhou, Peng Xiao, Yong Lin, Xin Gong, Shiyan Liu, Qingjia Xu, Minjin Wang, Haiyan Ren, Mengji Lu, Yuan Wang, Jing Zhu, Zhiping Xie, Huihui Li & Kefeng Lu
Biogenesis of autophagosomes is the early step of macroautophagy/autophagy and requires membrane acquisition mainly from ER-Golgi-sourced precursor vesicles. Matured autophagosomes fuse with lysosomes for final degradation. However, how this selective fusion is determined remains elusive. Here, we identified Sac1 by a high throughput screen in Saccharomyces cerevisiae to show it was critical for autophagosome-lysosome fusion through its PtdIns4P phosphatase activity. Sac1 deficiency caused a dramatic increase of PtdIns4P at early Golgi apparatus and abnormal incorporation...
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