The Atg2 protein, an integral membrane protein, is required for a range of functions including the regulation of autophagy in conjunction with the Atg1-Atg13 complex. Atg2 binds Atg9. It is a lipid transfer protein required for autophagosome completion and peroxisome degradation. It is part of the RBG (repeating beta-grooves) superfamily together with VPS13, SHIP164, Csf1, and the Hob proteins, which all share the same structure consisting of long hydrophobic grooves made of multiple repeating modules of five beta-sheets followed by a loop [1,2]. This is the N-terminal region of Atg2 proteins, covering the first three RGB modules.

1: A novel superfamily of bridge-like lipid transfer proteins. Neuman SD, Levine TP, Bashirullah A; Trends Cell Biol. 2022;32:962-974. PMID:35491307

2: Vps13-like proteins provide phosphatidylethanolamine for GPI anchor synthesis in the ER. Toulmay A, Whittle FB, Yang J, Bai X, Diarra J, Banerjee S, Levine TP, Golden A, Prinz WA; J Cell Biol. 2022; [Epub ahead of print] PMID:35015055