GDP Disodium Salt is widely used in biochemical research as a substrate or inhibitor in enzymatic studies, particularly those involving GTP-binding proteins or GTPases. It plays a crucial role in investigating cellular signaling pathways, as the diphosphate form derived from GTP hydrolysis, allowing researchers to study processes like protein synthesis, signal transduction, and cell cycle regulation. Additionally, it is employed in assays to measure the activity of enzymes such as kinases and phosphatases. Its stability and solubility make it a preferred choice for in vitro experiments, aiding in the understanding of molecular mechanisms in cellular functions.