Homodimeric subunit of autophagy-specific PtdIns-3-kinase complex I%3B required for the integrity of the active PtdIns-3-kinase complex I by maintaining an association between Vps15p-Vps34p and Atg14p-Vps30p subcomplexes%3B localizes to the pre-autophagosomal structure (PAS) in an Atg14p-dependent manner%3B ATG38 is non-essential but is required for macroautophagy