Adenosine-anchored triphosphate subsite probing: distinguishing between HER-2 and HER-4 tyrosine protein kinases

A strategy of full-site occupancy and stereospecific recognition in the triphosphate subsite was used to specifically inhibit two protein kinases HER-2 and HER-4 from the EGFR family. The SAR profiles of a panel of adenosine-anchored bicyclic heterocycles against HER-2 and HER-4 indicated that specificity can be derived for highly homologous protein kinases from stereospecific recognition in the triphosphate-subsite.