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a, docking pose of HS-243 in the ATP binding pocket of IRAK-4. π–π stacking interactions between HS-243 and Tyr-262 are in pink dots. Other interacting residues are labeled. Hydrogen bonds are shown with green dashes. b, comparison with TAK1 (PDB code 5V5N). c, kinase activity of IRAK-4 (WT), IRAK-4 (Y262A), and IRAK-4 (Y262T) tyrosine gatekeeper mutants. d, titrations of HS-243 against purified IRAK-4 Tyr-262 mutants (n = 2).
