A Liquid Chromatography/Mass Spectrometry-Based Method for the Selection of ATP Competitive Kinase Inhibitors

Abstract

The currently approved kinase inhibitors for therapeutic uses and a number of kinase inhibitors that are undergoing clinical trials are directed toward the adenosine triphosphate (ATP) binding site of protein kinases. The 5β-fluorosulfonylbenzoyl 5'-adenosine (FSBA) is an ATP-affinity reagent that covalently modifies a conserved lysine present in the nucleotide-binding site of most kinases. The authors have developed a liquid chromatography/mass spectrometry-basedmethod tomonitor binding ofATP competitive protein kinase inhibitors using FSBAas a nonselective activity-based probe for protein kinases. Their method provides a general, rapid, and reproducible means to screen and validate selective ATP competitive inhibitors of protein kinases.