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PYZD-4409 is a novel small molecule inhibitor of the ubiquitin-activating enzyme E1 with IC50 value of 20μM [1].

The ubiquitin-activating enzyme E1 is involved in the fist step of protein degradation. It uses ATP to adenylate and transfers the ubiquitin molecule to the next enzyme E2. It is demonstrated that the ubiquitination pathway is increased in the primary leukemia cells. Thus, inhibition of E1 can be a target of hematologic malignancies treatment. PYZD-4409 is screened out from a chemical library based on the pyrazolidine pharmacophore. The IC50 value(20μM) of it has been evaluated in a cell-free enzymatic assay. PYZD-4409 can also inhibit E1 in cultured K562 leukemia cells. PYZD-4409 causes cell death in leukemia, myeloma and solid tumor cell lines. In clonogenic growth assays, PYZD-4409 is found to reduce the growth of AML cells over normal hematopoietic cells. As an essential role of protein degradation, the inhibition of E1 resluts in the increased amounts of cyclin D3 and p53 [1].

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