
a potent cell-permeable proteasome and calpain inhibitor with IC50 of 0.1 and proteasome and calpain, respectively. The Ki of MG132 is 4 nM. MG132 NF-κB activation and IκBα degradation with an IC50 of 3 µM and prevents induces neurite outgrowth in PC12 cells and has anticancer properties the degradation of ubiquitin-conjugated proteins in mammalian cells and by the 26S complex without affecting its ATPase or isopeptidase activities.