Orthogonal IMiD-Degron Pairs Induce Selective Protein Degradation in Cells.
Patrick J Brennan, Rebecca E Saunders, Mary Spanou, Sarah E Singleton, Marta Serafini, Liang Sun, Guillaume P Heger, Agnieszka Konopacka, Ryan D Beveridge, C Cameron Taylor, Peter DePaola, Laurie Gordon, Shenaz B Bunally, Aurore Saudemont, Andrew B Benowitz
Abstract
Open AccessImmunomodulatory imide drugs (IMiDs), including thalidomide, lenalidomide, and pomalidomide, can be used to induce degradation of a protein of interest that is fused to a short degron motif, which often comprises a zinc finger (ZF). These IMiDs, however, also induce the degradation of endogenous ZF-containing neosubstrates, including IKZF1, IKZF3, and SALL4. To improve degradation selectivity, we took a bump-and-hole approach to design and screen bumped IMiD analogues against 8380 ZF mutants. This yielded a bumped IMiD analogue that induces efficient degradation of a mutant ZF degron, while not affecting other cellular proteins, including IKZF1, IKZF3, and SALL4. In proof-of-concept studies, this system was applied to induce degradation of the optimum degron fused to CDK9, HPRT1, NanoLuc, or TRIM28. We anticipate that this system will be a valuable addition to the current arsenal of degron systems for use in target validation.