Covalent Pan-Kinase Inhibitors and Live-Cell Activity Probes
SUMMARY
A cell-permeable, covalent multikinase activity probe that enhances selective kinase detection in native cellular environments, enabling precise profiling of kinase targets and inhibitor engagement for improved drug development and cancer treatment strategies
The Unmet Need: Selective, physiologically relevant kinase activity probes in native cellular contexts
- Existing kinase assays rely heavily on recombinant proteins or lysate-based methods which lack the ability to distinguish physiologically relevant kinase targets from off-target interactions within the complex cellular proteome, limiting accurate characterization of drug-target engagement and inhibitor specificity. Comprehensive, selective kinase profiling in living cells remains a critical challenge due to the broad protein kinase superfamily and pervasive off-target labeling by conventional probes.
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The growing emphasis on chemical proteomics and live-cell phenotypic profiling demands innovative tools that can measure endogenous kinase activity and inhibitor interactions directly in native biological systems, leveraging evolving computational methods and mass spectrometry technologies to deepen insight into kinase biology and pharmacology.
The Proposed Solution: Integrated computational and chemoproteomic design of covalent kinase probes targeting conserved catalytic lysine residues
- The faculty inventor developed a novel suite of covalent kinase activity probes derived from known kinase inhibitor scaffolds, which incorporate arylsulfonyl fluoride warheads designed to covalently target the conserved catalytic lysine in active protein kinases. Key probe variants were developed through rigorous in silico docking, molecular dynamics simulations, covalent kinetics modeling, and biochemical validation, revealing cell permeability, selective multi-kinase engagement, and dose-dependent target labeling.
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These probes differ from existing broad-scale probes by providing more selective kinase subfamily profiles and reduced off-target global proteome labeling, while competitive binding assays and kinetic modeling confirm active-site specific engagement and detailed mechanistic parameters. The probes have been validated in multiple human cancer cell lines and recombinant kinase assays, with demonstrated labeling of over 100 native kinases, including known and novel targets, providing detailed kinetic and conformational insights essential for further drug discovery applications.
FIGURE
ADVANTAGES
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Selective, covalent targeting of conserved catalytic lysine
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Validated in live cells, lysates, and recombinant proteins
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Computationally guided design optimizing binding and reactivity
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Reduced proteome-wide off-target labeling
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Quantitative kinetic modeling for detailed potency assessment
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Compatibility with mass spectrometry and proximity ligation assays
APPLICATIONS
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Kinase target profiling in native cancer cell environments
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Assessment of kinase inhibitor on-target and off-target engagement
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Cancer drug development and mechanism-of-action studies