Journal
ACS MEDICINAL CHEMISTRY LETTERS
Volume 6, Issue 6, Pages 711-715Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmedchemlett.5b00151
Keywords
Pre-DFG residue; PAK1 kinase; aminopyrazole
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To increase kinase selectivity in an aminopyrazole-based PAK1 inhibitor series, analogues were designed to interact with the PAKI deep-front pocket pre-DFG residue Thr-406, a residue that is hydrophobic in most kinases. This goal was achieved by installing lactam head groups to the aminopyrazole hinge binding moiety. The corresponding analogues represent the most kinase selective ATP-competitive Group I PAK inhibitors described to date. Hydrogen bonding with the Thr-406 side chain was demonstrated by X-ray crystallography, and inhibitory activities, particularly against kinases with hydrophobic pre-DFG residues, were mitigated. Leveraging hydrogen bonding side chain interactions with polar pre-DFG residues is unprecedented, and similar strategies should be applicable to other appropriate kinases.
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