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Determining Cysteines Available for Covalent Inhibition Across the Human Kinome.
Journal of Medicinal Chemistry 2017 April 14
Covalently bound protein kinase inhibitors have been frequently designed to target noncatalytic cysteines at the ATP binding site. Thus, it is important to know if a given cysteine can form a covalent bond. Here we combine a function-site interaction fingerprint method and DFT calculations to determine the potential of cysteines to form a covalent interaction with an inhibitor. By harnessing the human structural kinome, a comprehensive structure-based binding site cysteine data set was assembled. The orientation of the cysteine thiol group indicates which cysteines can potentially form covalent bonds. These covalent inhibitor easy-available cysteines are located within five regions: P-loop, roof of pocket, front pocket, catalytic-2 of the catalytic loop, and DFG-3 close to the DFG peptide. In an independent test set these cysteines covered 95% of covalent kinase inhibitors. This study provides new insights into cysteine reactivity and preference which is important for the prospective development of covalent kinase inhibitors.
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