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Autophagosome biogenesis comes out of the black box.

Abstract

Macroautophagic clearance of cytosolic materials entails the initiation, growth and closure of autophagosomes. Cargo triggers the assembly of a web of cargo receptors and core machinery. Autophagy-related protein 9 (ATG9) vesicles seed the growing autophagosomal membrane, which is supplied by de novo phospholipid synthesis, phospholipid transport via ATG2 proteins and lipid flipping by ATG9. Autophagosomes close via ESCRT complexes. Here, we review recent discoveries that illuminate the molecular mechanisms of autophagosome formation and discuss emerging questions in this rapidly developing field.

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