The Cullin-RING E3 ubiquitin ligases (CRLs) regulate homeostasis of ~20% of cellular proteins and their activation require neddylation of their cullin subunit. Cullin neddylation is modulated by a scaffolding DCN protein through interactions with bot ...
The Cullin-RING E3 ubiquitin ligases (CRLs) regulate homeostasis of ~20% of cellular proteins and their activation require neddylation of their cullin subunit. Cullin neddylation is modulated by a scaffolding DCN protein through interactions with both the cullin protein and an E2 enzyme such as UBC12. Here we report the development of DI-591 as a high-affinity, cell-permeable small-molecule inhibitor of the DCN1-UBC12 interaction. DI-591 binds to purified recombinant human DCN1 and DCN2 proteins with K i values of 10-12 nM, and disrupts the DCN1-UBC12 interaction in cells. Treatment with DI-591 selectively converts cellular cullin 3 into an un-neddylated inactive form with no or minimum effect on other cullin members. Our data firmly establish a previously unrecognized specific role of the DCN1-UBC12 interaction for cellular neddylation of cullin 3. DI-591 is an excellent probe compound to investigate the role of the cullin 3 CRL ligase in biological processes and human diseases.
Organizational Affiliation:
Department of Medicinal Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, USA. shaomeng@umich.edu.,Department of Pathology, University of Michigan, Ann Arbor, Michigan, 48109, USA.,Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, 48109, USA. shaomeng@umich.edu.,Life Sciences Institute, University of Michigan, Ann Arbor, Michigan, 48109, USA.,Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, 48109, USA.,Department of Oncological Sciences, Mount Sinai School of Medicine, 1425 Madison Avenue, New York, New York, 10029, USA.,Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou, 310029, China.,Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan, 48109, USA.,Department of Pharmacology, University of Michigan, Ann Arbor, Michigan, 48109, USA. shaomeng@umich.edu.
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