Primary Citation of Related Structures: 5K9I, 5U8L
PubMed Abstract:
Protein kinases comprise a large family of structurally related enzymes. A major goal in kinase-inhibitor development is to selectively engage the desired kinase while avoiding myriad off-target kinases. However, quantifying inhibitor interactions with multiple endogenous kinases in live cells remains an unmet challenge ...
Protein kinases comprise a large family of structurally related enzymes. A major goal in kinase-inhibitor development is to selectively engage the desired kinase while avoiding myriad off-target kinases. However, quantifying inhibitor interactions with multiple endogenous kinases in live cells remains an unmet challenge. Here, we report the design of sulfonyl fluoride probes that covalently label a broad swath of the intracellular kinome with high efficiency. Protein crystallography and mass spectrometry confirmed a chemoselective reaction between the sulfonyl fluoride and a conserved lysine in the ATP binding site. Optimized probe 2 (XO44) covalently modified up to 133 endogenous kinases, efficiently competing with high intracellular concentrations of ATP. We employed probe 2 and label-free mass spectrometry to quantify intracellular kinase engagement by the approved drug, dasatinib. The data revealed saturable dasatinib binding to a small subset of kinase targets at clinically relevant concentrations, highlighting the utility of lysine-targeted sulfonyl fluoride probes in demanding chemoproteomic applications.
Organizational Affiliation:
Medicine Design, Pfizer , Cambridge, Massachusetts 02139, United States.
4-[(4-{4-[(3-cyclopropyl-1H-pyrazol-5-yl)amino]-6-[(prop-2-yn-1-yl)carbamoyl]pyrimidin-2-yl}piperazin-1-yl)methyl]benzene-1-sulfonyl fluoride C25 H27 F N8 O3 S ZBSPMOBILDLOCV-UHFFFAOYSA-N
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