Component of the epg-6/atg-2 complex, which is involved in the generation of autophagosomes from omegasomes and in the distribution of atg-9 and atg-13 during the autophagy-mediated degradation of protein aggregates (PubMed:21802374). Binds to phosphatidylinositols on preautophagosomes, which are early autophagic structures, to promote autophagosome formation (PubMed:21802374). In particular, binds with high affinity to phosphatidylinositols including phosphatidylinositol 3-phosphate (PtdIns(3)P) and phosphatidylinositol 5-phosphate (PtdIns(5)P), but more weakly to phosphatidylinositol 4-phosphate (PtdIns(4)P) and phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P2) (PubMed:21802374). Involved in autophagy-mediated degradation of ribosomal RNA and ribosomal proteins in lysosomes, which is essential for maintaining nucleotide homeostasis (PubMed:30102152). Interacts with atg-2; the interaction is direct. Localizes to the cytoplasm of all cells during embryogenesis. Widely expressed in tissues including pharyngeal, muscle and neuronal tissues. Expressed throughout development. The LRRG motif is required for recruitment to phosphatidylinositols including phosphatidylinositol 3-phosphate (PtdIns(3)P), phosphatidylinositol 5-phosphate (PtdIns(5)P), phosphatidylinositol 4-phosphate (PtdIns(4)P) and phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P2). Belongs to the WD repeat PROPPIN family.