Kemptide acetate salt is widely used in biochemical research as a substrate to study the activity of protein kinases, particularly cAMP-dependent protein kinase (PKA). Its application is crucial in understanding cellular signaling pathways and kinase mechanisms. Researchers utilize it to assess kinase activity, screen kinase inhibitors, and develop assays for drug discovery. Additionally, it serves as a tool in studying phosphorylation processes and their regulatory roles in cellular functions. Its stability and specificity make it a valuable reagent in enzymology and molecular biology studies.