Plays a role in autophagy. Functions at the preautophagosomal structure (PAS) in order to form normal autophagosomes under starvation conditions. Also plays a role in mitophagy and regulation of filamentous growth (By similarity). Forms a stable complex with ATG17 and ATG31. Interacts directly with ATG31. The ATG17-ATG29-ATG31 complex interacts with the ATG1-ATG13 complex. Note=The interaction with the ATG1-ATG13 complex is induced by starvation. Localizes also to other perivacuolar punctate structures. Belongs to the ATG29 family.