Involved in 2 distinct lysosomal degradation pathways: acts as a regulator of autophagy and as a regulator of G-protein coupled receptors turnover. Regulates degradation in lysosomes of a variety of G-protein coupled receptors via its interaction with GPRASP1/GASP1. Homodimer (via coiled-coil domain) (PubMed:28218432). Interacts (via coiled-coil domain) with ATG14 (via coiled-coil domain); this interaction is tighter than BECN2 self-association (PubMed:23954414, PubMed:28218432). Interacts with AMBRA1, UVRAG and PIK3C3/VPS34; these interactions are not disrupted by starvation (PubMed:23954414). Does not interact with RUBCN (PubMed:23954414). Interacts (via N-terminus) with GPRASP1/GASP1; the interaction is direct (PubMed:23954414). Present in fetal and adult brain (at protein level). Belongs to the beclin family.