(R) -MG-132

(R) -MG-132 is the enantiomer of MG-132. (R) -MG-132 stereoisomer is a more potent proteasome inhibitor than MG-132. (R) -MG-132 is studied as a potential chymotrypsin-like inhibitor, trypsin-like, and peptidylglutamyl peptide hydrolyzing activities of proteasome. MG-132 and (R) -MG-132 are investigated for inhibition of ChTL, trypsin-like (TL) and peptidylglutamyl peptide hydrolyzing (PGPH) activities of purified 20S proteasomes isolated from human erythrocytes.For (R) -MG-132, the IC50s of 0.22 μM, 34.4 μM, and 2.95 μM for ChTL, TL, and PGPH, respectively. For MG-132, the IC50s of 0.89 μM, 104.43 μM, and 5.7 μM for ChTL, TL, and PGPH, respectively.