MLN2238(Ixazomib)能抑制20S蛋白酶体的糜蛋白酶样蛋白水解位点(β5)，IC50和Ki分别为3.4 nM和0.93 nM。 MLN2238 inhibits the chymotrypsin-like proteolytic (β5) site of the 20S proteasome with IC50 and Ki of 3.4 nM and 0.93 nM in cell-free assays, respectively, also inhibits the caspase-like (β1) and trypsin-like (β2) proteolytic sites, with IC50 of 31 and 3500 nM.