Autophagy-Independent Lysosomal Targeting Regulated by ULK1/2-FIP200 and ATG9.

Autophagy-Independent Lysosomal Targeting Regulated by ULK1/2-FIP200 and ATG9.
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DOI:
10.1016/j.celrep.2017.08.034
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发表时间:
2017-09-05
期刊:
影响因子:
8.8
通讯作者:
Murphy LO
Murphy LO
中科院分区:
生物学1区
文献类型:
--
作者:
Goodwin JM;Dowdle WE;DeJesus R;Wang Z;Bergman P;Kobylarz M;Lindeman A;Xavier RJ;McAllister G;Nyfeler B;Hoffman G;Murphy LO

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Iron is vital for many homeostatic processes and its liberation from ferritin nanocages occurs in the lysosome. Studies indicate that ferritin and its binding partner nuclear receptor coactivator-4 (NCOA4) are targeted to lysosomes by a form of selective autophagy. By using genome-scale functional screening we identify an alternative lysosomal transport pathway for ferritin that requires FIP200, ATG9A, VPS34 and TAX1BP1 but lacks involvement of the ATG8 lipidation machinery that constitutes classical macroautophagy. TAX1BP1 binds directly to NCOA4 and is required for lysosomal trafficking of ferritin under basal and iron depleted conditions. Under basal conditions ULK1/2-FIP200 controls ferritin turnover but its deletion leads to TAX1BP1-dependent activation of TBK1 which regulates redistribution of ATG9A to the Golgi enabling continued trafficking of ferritin. Cells expressing an Amyotrophic Lateral Sclerosis (ALS)-associated TBK1 allele are incapable of degrading ferritin suggesting a novel molecular mechanism that explains the presence of iron deposits in patient brain biopsies.
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