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Updated: May 21, 2026

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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.
Researchers discovered PLX-4104, a novel oral drug that selectively degrades the BRD4 protein. This targeted protein degradation approach shows promise for treating acute myeloid leukemia (AML) by causing complete tumor regression in models.
Area of Science:
- Biochemistry
- Medicinal Chemistry
- Oncology
Background:
- Targeted protein degradation (TPD) utilizes the ubiquitin-proteasome system (UPS) for selective elimination of disease-causing proteins.
- Small molecules are emerging as key tools in TPD for drug discovery.
Purpose of the Study:
- To discover and optimize novel monovalent direct degraders targeting BRD4.
- To evaluate the efficacy of these degraders in acute myeloid leukemia (AML) models.
Main Methods:
- Ultrahigh-throughput screening to identify initial degraders.
- Structure-guided medicinal chemistry and structure-activity relationship (SAR) studies for optimization.
- In vitro assays for protein degradation and antiproliferative activity.
- In vivo studies using AML xenograft models.
Main Results:
- Discovery of BRD4-selective monovalent direct degraders acting via DCAF11.
- Identification of the orally bioavailable compound PLX-4104.
- PLX-4104 demonstrated rapid, complete, and selective BRD4 degradation in vitro.
- Potent antiproliferative activity against AML models and complete tumor regression in vivo.
Conclusions:
- PLX-4104 is an effective orally bioavailable BRD4 degrader with significant potential in AML treatment.
- This work establishes a foundation for developing new monovalent direct degraders for various therapeutic applications beyond BRD4.
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