GAP (GTPase-activating protein)

GAP, or GTPase-activating protein, is a type of protein that helps turn off other proteins called GTPases, which act like molecular switches inside cells. GTPases switch between active and inactive states by binding to molecules called GTP or GDP. GAPs accelerate the process of GTP hydrolysis, converting GTP to GDP, and thus deactivate the GTPase. This regulation is crucial for controlling various cellular activities, such as growth, movement, and signaling pathways. Essentially, GAPs ensure that GTPases turn off at the right time, maintaining proper cellular function.