Optimized chemical proteomics assay for kinase inhibitor profiling.

Area of Science:

• Chemical Proteomics
• Biochemistry
• Medicinal Chemistry

Background:

• Solid-supported probes are effective for chemical proteomics.
• Kinobeads technology utilizes kinase inhibitors on Sepharose for kinome enrichment.
• This method is valuable for profiling kinase inhibitors and identifying new drug targets.

Purpose of the Study:

• To optimize the kinobead assay for broader kinome coverage.
• To demonstrate the utility of the enhanced kinobead assay for profiling small molecule kinase inhibitors.
• To showcase its application in drug discovery, target identification, and understanding drug resistance.

Main Methods:

• Development of an optimized kinobead assay combining five chemical probes.
• Application of the assay across four different cell lines for comprehensive kinome analysis.
• Quantitative mass spectrometry for affinity enrichment and profiling of kinase inhibitors.
• Reprofiling of nine known small molecule kinase inhibitors.

Main Results:

• The optimized assay covers approximately half of the human kinome (around 260 kinases) in a single experiment.
• Successful reprofiling of nine diverse kinase inhibitors, including Alvocidib, Crizotinib, Dasatinib, and Imatinib.
• Demonstrated the assay's utility for large-scale kinome profiling and inhibitor characterization.
• The assay facilitates a two-in-one binding and selectivity assessment.

Conclusions:

• The optimized kinobead assay significantly enhances the efficiency and scope of chemical proteomics for kinome analysis.
• This improved technology serves as a powerful tool for medicinal chemistry, enabling target identification and the characterization of kinase inhibitors.
• The assay aids in uncovering drug resistance mechanisms and potential sources of toxicity, supporting safer drug development.