... protease, and an ubiq-uitin-degrading enzyme in yeast, as well as the identity of a catalytic triad composed of histidine, cysteine, andaspartic acid, I7L has been classified as a cysteine protein-ase. ... A1 0L (P 4a) gene was amplified by polymerase chainreaction using oligonucleotides KH10 (5' CATGCCAT-GGATGATGCCTATTAAGTCAATAGTTACT CTT-3') andKH11 (5'-CCGCTCGAGTTATTCATCATCAAAAGAGACA-GAGTC-3'), ... activity. Effect of Inhibitors on Protease Activity and Characterization as a Cysteine ProteinaseThe in vitro assay allowed us to test the effects of variousprotease inhibitors, as well as specific small...