TAS4464 hydrochloride is a long-acting, highly selective covalent inhibitor targeting NEDD8-activating enzyme (NAE) (IC50=0.955 nM), and also inhibits CAII with an IC50 of 0.73 µM, which is less potent than MLN4924 (HY-70062). The IC50 values of TAS4464 hydrochloride against other E1 enzymes UAE and SAE are 449 nM and 1280 nM, respectively. TAS4464 hydrochloride targets NEDD8 in an ATP-dependent manner to inhibit NAE, blocks the neddylation pathway, causes accumulation of CRL ubiquitin ligase substrates (such as CDT1, p27, phosphorylated IkappaBalpha), and further induces tumor cell apoptosis. TAS4464 hydrochloride exhibits antiproliferative and cytotoxic effects, and has broad-spectrum antitumor activity against various hematologic and solid tumor cell lines as well as patient-derived tumor cells. TAS4464 hydrochloride has a wide therapeutic window, without obvious toxicity. TAS4464 hydrochloride can be used in the research of hematologic malignancies (leukemia, lymphoma, multiple myeloma, etc.) and solid tumors (small cell lung cancer, colorectal cancer, sarcoma, endometrial cancer, ovarian cancer, etc.)[1].
