... humanglutamate carboxypeptidase II; Z-Leu-Leu-Leucinal (Z-LLnL,MG132), N-benzyloxycarbonyl-L-leucinyl-L-leucinyl-L-leucinal;Z-Leu-Leu-Norvalinal (Z-LLnV, MG115), N-benzyloxycarbonyl-L-leucinyl-L-leucinyl-L-norvalinal.Enzyme: ... form of the enzyme. Furthertruncation at the N-terminus, or addition of the V5-His tag at the C-terminus, significantly compromises the proteolyticactivity of the variants, by affecting the turnover ... (Z-Leu-Leu-Nor-valinal, Z-LLnV, MG115; 50 lMfinal concentration),or N-benzyloxycarbonyl-L-leucinyl-L-leucinyl-L-leucinal(Z-Leu-Leu-Leucinal, Z-LLnL, MG132; 50 lMfinal con-centration) was added to the medium...