E2 conjugating enzyme responsible for the E2-like covalent binding of phosphatidylethanolamine to the C-terminal Gly of ATG8. This step is required for the membrane association of ATG8. The formation of the ATG8-phosphatidylethanolamine conjugate is essential for autophagy and for the cytoplasm to vacuole transport (Cvt). Interacts with ATG8 through an intermediate thioester bond between Cys-258 and the C-terminal Gly of ATG8. Also interacts with the C-terminal region of the E1-like ATG7 enzyme (By similarity). Belongs to the ATG3 family.