Journal
SLAS DISCOVERY
Volume 26, Issue 4, Pages 547-559Publisher
ELSEVIER SCIENCE INC
DOI: 10.1177/24725552211000673
Keywords
targeted protein degradation; BiDAC; ubiquitination; kinetics
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This work developed an in vitro system to measure the kinetics of BRD4 BD1 ubiquitination and characterized the affinities between BiDACs, BD1, and CRBN, providing a new tool for understanding and optimizing the catalytic and thermodynamic properties of BiDACs.
Recent advances in targeted protein degradation have enabled chemical hijacking of the ubiquitin-proteasome system to treat disease. The catalytic rate of cereblon (CRBN)-dependent bifunctional degradation activating compounds (BiDAC), which recruit CRBN to a chosen target protein, resulting in its ubiquitination and proteasomal degradation, is an important parameter to consider during the drug discovery process. In this work, an in vitro system was developed to measure the kinetics of BRD4 bromodomain 1 (BD1) ubiquitination by fitting an essential activator kinetic model to these data. The affinities between BiDACs, BD1, and CRBN in the binary complex, ternary complex, and full ubiquitination complex were characterized. Together, this work provides a new tool for understanding and optimizing the catalytic and thermodynamic properties of BiDACs.
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