Binds directly and specifically 1,2-Diacyl-sn-glycero-3- phospho-(1'-myo-inositol-3',4',5'-bisphosphate) (PIP3) leading to the recruitment of PIP3 to mitochondria and may play a role in the regulation of the platelet activation via AKT/GSK3B/cGMP signaling pathways (PubMed:29786068). May act as transcription factor that regulates SREBP1 (isoform SREBP-1C) expression in order to modulate triglyceride (TG) homeostasis in hepatocytes (PubMed:25855506, PubMed:29187281). {ECO:0000269|PubMed:25855506, ECO:0000269|PubMed:29187281, ECO:0000269|PubMed:29786068}. This is the function of ENSG00000165775 (FUNDC2, FUN14 domain containing 2).