MLN7243

MLN7243 is an inhibitor of ubiquitin-activating enzyme (UAE; IC50 = 1 nM).{52441} It is selective for UAE over NEDD8-activating enzyme (NAE), SUMO-activating enzyme (SAE), and the autophagy-activating enzyme ATG7 (IC50s = 28, 850, and >10,000 nM, respectively). MLN7243 inhibits proliferation in a panel of 30 cancer cell lines (EC50s = 0.006-1.1 µM). It activates the unfolded protein response (UPR) and expansion of the endoplasmic reticulum surface area, a marker of ER stress, in HCT116 cells. In vivo, MLN7243 (12.5-25 mg/kg) reduces tumor growth in WSU-DLCL2, HCT116, Calu-6, THP-1, CWR22, HCC70, and MM.1S mouse xenograft models, as well as patient-derived xenograft (PDX) mouse models of colon, lung, breast, ovarian, and neck cancer.