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Updated: May 21, 2026

High-Throughput Cellular Profiling of Targeted Protein Degradation Compounds Using HiBiT CRISPR Cell Lines
Published on: November 9, 2020
Discovery and Structural Optimization of BRD4-Selective Monovalent Direct Degraders
Geoffray Leriche1, Farhana Barmare1, Julia I Toth1
1Plexium, 9330 Scranton Road, San Diego, California 92121, United States.
None:
Targeted protein degradation (TPD) via the ubiquitin-proteasome system (UPS) is a rapidly advancing drug discovery strategy that enables the selective elimination of pathogenic proteins using small molecules. Here, we report the discovery of BRD4-selective monovalent direct degraders acting through DCAF11, identified by ultrahigh-throughput screening and subsequently optimized through a structure-guided medicinal chemistry campaign. Structure-activity relationship (SAR) studies support a direct degrader mechanism and culminated in the identification of the orally bioavailable compound PLX-4104. In vitro, PLX-4104 induces rapid, complete, and selective degradation of BRD4 and exhibits potent antiproliferative activity in acute myeloid leukemia (AML) models. In vivo, PLX-4104 treatment resulted in complete tumor regression in the AML MV-4-11 xenograft model. Collectively, this lays the groundwork for the rational development of monovalent direct degraders with applications extending beyond BRD4.
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