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Sarott, Roman C.; You, Inchul; Li, Yen-Der; Toenjes, Sean T.; Donovan, Katherine A.; Seo, Pooreum; Ordonez, Martha; Byun, Woong Sub; Hassan, Muhammad Murtaza; Wachter, Franziska; Chouchani, Edward T.; Słabicki, Mikołaj; Fischer, Eric S.; Ebert, Benjamin L.; Hinshaw, Stephen M.; Gray, Nathanael S.
Journal of the American Chemical Society, 10/2023, Volume: 145, Issue: 40Journal Article
Targeted protein degradation relies on small molecules that induce new protein–protein interactions between targets and the cellular protein degradation machinery. Most of these small molecules feature specific ligands for ubiquitin ligases. Recently, the attachment of cysteine-reactive chemical groups to pre-existing small molecule inhibitors has been shown to drive specific target degradation. We demonstrate here that different cysteine-reactive groups can specify target degradation via distinct ubiquitin ligases. By focusing on the bromodomain ligand JQ1, we identify cysteine-reactive functional groups that drive BRD4 degradation by either DCAF16 or DCAF11. Unlike proteolysis-targeting chimeric molecules (PROTACs), the new compounds use a single small molecule ligand with a well-positioned cysteine-reactive group to induce protein degradation. The finding that nearly identical compounds can engage multiple ubiquitination pathways suggests that targeting cellular pathways that search for and eliminate chemically reactive proteins is a feasible avenue for converting existing small molecule drugs into protein degrader molecules.
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