Structural highlights
FunctionD9IEF7_BPT4 DCNL1_HUMAN Part of an E3 ubiquitin ligase complex for neddylation. Required for neddylation of cullin components of E3 cullin-RING ubiquitin ligase complexes by enhancing the rate of cullins neddylation. Functions to recruit the NEDD8-charged E2 enzyme to the cullin component. Involved in the release of inhibitory effets of CAND1 on cullin-RING ligase E3 complex assembly and activity. Acts also as an oncogene facilitating malignant transformation and carcinogenic progression (By similarity). Publication Abstract from PubMedChemical control of cullin neddylation is attracting increased attention based largely on the successes of the NEDD8-activating enzyme (E1) inhibitor pevonedistat. Recently reported chemical probes enable selective and time-dependent inhibition of downstream members of the neddylation trienzymatic cascade including the co-E3, DCN1. In this work, we report the optimization of a novel class of small molecule inhibitors of the DCN1-UBE2M interaction. Rational X-ray co-structure enabled optimization afforded a 25-fold improvement in potency relative to the initial screening hit. The potency gains are largely attributed to additional hydrophobic interactions mimicking the N-terminal acetyl group that drives binding of UBE2M to DCN1. The compounds inhibit the protein-protein interaction, block NEDD8 transfer in biochemical assays, engage DCN1 in cells, and selectively reduce the steady-state neddylation of Cul1 and Cul3 in two squamous carcinoma cell lines harboring DCN1 amplification. Discovery of Novel Pyrazolo-pyridone DCN1 Inhibitors Controlling Cullin Neddylation.,Kim HS, Hammill JT, Scott DC, Chen Y, Min J, Rector J, Singh B, Schulman BA, Guy RK J Med Chem. 2019 Sep 26;62(18):8429-8442. doi: 10.1021/acs.jmedchem.9b00410. Epub, 2019 Sep 13. PMID:31465221[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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