May modulate transcriptional activation by target nuclear receptors. Can act as transcriptional activator (in vitro). Involved in starvation-induced autophagy probably by its association with PI3K complex I (PI3KC3-C1). However, effects has been described variably. Involved in the induction of starvation-induced autophagy (PubMed:24785657). Stabilzes PI3KC3-C1 assembly and enhances ATG14-linked lipid kinase activity of PIK3C3 (By similarity). Proposed to negatively regulate basal and starvation-induced autophagy and to inhibit PIK3C3 activity by modulating interactions in PI3KC3-C1 (PubMed:25086043). May be involved in autophagosome biogenesis (PubMed:25086043). May play a role in neural progenitor cell survival during differentiation (By similarity). Interacts with PPARA, PPARD and PPARG. Interacts with RARA, RARG and RXRA in the presence of bound ligand (PubMed:15610520). Interacts with SCOC (PubMed:22354037). Associates with the PI3K complex I (PI3KC3-C1); the direct binding partner in the complex is reported variably as PIK3R4 or ATG14 (PubMed:24785657). Detected in keratinocytes, liver and placenta (PubMed:15610520). Expressed in a subset of cells in pediatric medulloblastoma (PubMed:18619852).