摘要:
A new class of serine/threonine protein kinase inhibitors was designed by associating, in the same structure, mimics of both the ATP binding site and a protein substrate. Among the several potent antagonists which were obtained, the most active consists of isoquinoline-5-sulfonamide, as ATP mimic, and Ser-Arg6, as peptidic moiety, bound by a -NH(CH2)2NH(CH2)2CO- linker. This compound, with a K(i) of 0.1-mu-M toward protein kinase C (PKC) and 0.004-mu-M toward cyclic AMP dependent protein kinase (PKA), is respectively 60- and 750-fold more active than the commercial inhibitor H-7.