... nonpeptidecaspase-3 inhibitors. The results of dilution and dialy-sis experiments indicated that our compounds are irre-versible and slow-binding inhibitors. Research on the inhibitory mechanism of isoquinoline-1,3,4-trione ... XhoI and NheI ⁄ XhoI, caspase 2, 3, 7 and 9 cDNA with the nucleotidefragments encoding the His6 tag at the C-terminus of the recombinant proteins were cloned into pET32b expressionvectors, and ... structure and activity of isoquinoline-1,3,4-trione, a series of its derivatives were designed and synthesized. Most of the derivatives inhibited caspase-3 activity (with IC50val-ues in the nanomolar...