GTP-binding protein involved in nucleocytoplasmic transport. Required for the import of protein into the nucleus and also for RNA export. Involved in chromatin condensation and control of cell cycle (By similarity). Found in a nuclear export complex with RanGTP, exportin and pre-miRNA (By similarity). Interacts with RanBP1a and RanBP1b (PubMed:9025305). Interacts with PHRIP1 (PubMed:17530257). Interacts with KPNB1 (PubMed:23582042). Binds to PHIP1 (PubMed:18621982). Localized in the perinuclear region with the highest concentration at the nuclear envelope at the interphase. RAN2 transcripts mRNA interacts with PHIP1 to be distributed toward the cell plate during cytokinesis. Belongs to the small GTPase superfamily. Ran family.