Samuel E Dalton, Lars Dittus, Daniel A. Thomas, Maire A. Convery, Joao Nunes, Jacob T. Bush, John P. Evans, Thilo Werner, Marcus Bantscheff, John A. Murphy, and Sebastien Campos
J. Am. Chem. Soc., 2017
Selective covalent inhibition of kinases by targeting poorly conserved cysteines has proven highly fruitful to date in the development of chemical probes and approved drugs. However, this approach is limited to ~200 kinases possessing such a cysteine near the ATP-binding pocket. Herein, we report a novel approach to achieve selective, irreversible kinase inhibition, by targeting the conserved catalytic lysine residue. We have illustrated our approach by developing selective, covalent PI3Kδ inhibitors that exhibit nanomolar potency in cellular assays, and a duration of action >48 h in CD4+ T cells. Despite conservation of the lysine residue throughout the kinome, the lead compound shows high levels of selectivity over a selection of lipid and protein kinases in biochemical assays, as well as covalent binding to very few off-target proteins in live-cell proteomic studies. We anticipate this approach could offer an alternative general strategy, to targeting non-conserved cysteines, for the development of selective covalent kinase inhibitors.
A blog highlighting recent publications in the area of covalent modification of proteins, particularly relating to covalent-modifier drugs. @CovalentMod on Twitter and @email@example.com on Mastodon
Saturday, December 16, 2017
Selectively targeting the kinome-conserved lysine of PI3Kδ as a general approach to covalent kinase inhibition
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