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SNX18 regulates ATG9A trafficking from recycling endosomes by recruiting Dynamin-2.

ABSTRACT: Trafficking of mammalian ATG9A between the Golgi apparatus, endosomes and peripheral ATG9A compartments is important for autophagosome biogenesis. Here, we show that the membrane remodelling protein SNX18, previously identified as a positive regulator of autophagy, regulates ATG9A trafficking from recycling endosomes. ATG9A is recruited to SNX18-induced tubules generated from recycling endosomes and accumulates in juxtanuclear recycling endosomes in cells lacking SNX18. Binding of SNX18 to Dynamin-2 is important for ATG9A trafficking from recycling endosomes and for formation of ATG16L1- and WIPI2-positive autophagosome precursor membranes. We propose a model where upon autophagy induction, SNX18 recruits Dynamin-2 to induce budding of ATG9A and ATG16L1 containing membranes from recycling endosomes that traffic to sites of autophagosome formation.

SUBMITTER: Soreng K

PROVIDER: S-EPMC5891424 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature

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SNX18 regulates ATG9A trafficking from recycling endosomes by recruiting Dynamin-2.

Søreng Kristiane K Munson Michael J MJ Lamb Christopher A CA Bjørndal Gunnveig T GT Pankiv Serhiy S Carlsson Sven R SR Tooze Sharon A SA Simonsen Anne A

EMBO reports 20180207 4

Trafficking of mammalian ATG9A between the Golgi apparatus, endosomes and peripheral ATG9A compartments is important for autophagosome biogenesis. Here, we show that the membrane remodelling protein SNX18, previously identified as a positive regulator of autophagy, regulates ATG9A trafficking from recycling endosomes. ATG9A is recruited to SNX18-induced tubules generated from recycling endosomes and accumulates in juxtanuclear recycling endosomes in cells lacking SNX18. Binding of SNX18 to Dynam ...[more]

PMID: 29437695

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