Abstract:
:The drugs lenalidomide and pomalidomide bind to the protein cereblon, directing the CRL4-CRBN E3 ligase toward the transcription factors Ikaros and Aiolos to cause their ubiquitination and degradation. Here we describe CC-220 (compound 6), a cereblon modulator in clinical development for systemic lupus erythematosis and relapsed/refractory multiple myeloma. Compound 6 binds cereblon with a higher affinity than lenalidomide or pomalidomide. Consistent with this, the cellular degradation of Ikaros and Aiolos is more potent and the extent of substrate depletion is greater. The crystal structure of cereblon in complex with DDB1 and compound 6 reveals that the increase in potency correlates with increased contacts between compound 6 and cereblon away from the modeled binding site for Ikaros/Aiolos. These results describe a new cereblon modulator which achieves greater substrate degradation via tighter binding to the cereblon E3 ligase and provides an example of the effect of E3 ligase binding affinity with relevance to other drug discovery efforts in targeted protein degradation.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Matyskiela ME,Zhang W,Man HW,Muller G,Khambatta G,Baculi F,Hickman M,LeBrun L,Pagarigan B,Carmel G,Lu CC,Lu G,Riley M,Satoh Y,Schafer P,Daniel TO,Carmichael J,Cathers BE,Chamberlain PPdoi
10.1021/acs.jmedchem.6b01921subject
Has Abstractpub_date
2018-01-25 00:00:00pages
535-542issue
2eissn
0022-2623issn
1520-4804journal_volume
61pub_type
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