Most likely a component of the atg-5-atg-12-atg-16.1/atg-16.2 complex, which is recruited to the preautophagosomal membrane and associates with lgg-2 to promote autophagosome formation (PubMed:24185444, PubMed:26687600). Although its role in autophagosome formation may be distinct to the role of atg-16.2, it functions in a partially redundant manner with atg-16.2 to regulate autophagic processes (PubMed:24185444). Homodimer (via N-terminus) (PubMed:24185444). Most likely a component of a complex at least containing atg-5, lgg-3, atg-16.1 and/or atg-16.2 (Probable). Interacts (via N-terminus) with atg-16.2 (via N-terminus) (PubMed:24185444). Interacts (via N-terminus) with atg-5 (PubMed:24185444). Interacts (via WD domain) with lgg-2; the interaction is direct (PubMed:26687600). Expressed in neurons, pharyngeal muscles, body wall muscle cells and intestinal cells. Expressed throughout development. Belongs to the WD repeat tipD family.