RanGAP1 is a protein that associates with the nuclear pore complex and participates in the regulation of nuclear transport. RanGAP1 plays a crucial role in regulating the transport of proteins and RNA across the nuclear envelope, which is essential for maintaining cellular function and homeostasis. Located predominantly in the nucleus, RanGAP1 is involved in the hydrolysis of GTP to GDP, thereby controlling the active and inactive states of the RanGTPase. This regulation is vital for processes such as DNA replication and mitosis, as well as the transport of macromolecules through the nuclear pore complex. The interplay between Ran GAP1 and RCC1, which promotes the exchange of GDP for GTP, highlights the importance of RanGAP1 in cellular signaling pathways.