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A new generation of heterobifunctional small molecules, termed proteolysis targeting chimeras (PROTACs), targets proteins for degradation through recruitment to E3 ligases and holds significant therapeutic potential. Despite numerous successful examples, PROTAC small molecule development remains laborious and unpredictable, involving testing compounds for end-point degradation activity at fixed times and concentrations without resolving or optimizing for the important biological steps required for the process. Given the complexity of the ubiquitin proteasomal pathway, technologies that enable real-time characterization of PROTAC efficacy and mechanism of action are critical for accelerating compound development, profiling, and improving guidance of chemical structure-activity relationship. Here, we present an innovative, modular live-cell platform utilizing endogenous tagging technologies and apply it to monitoring PROTAC-mediated degradation of the bromodomain and extra-terminal family members. We show comprehensive real-time degradation and recovery profiles for each target, precisely quantifying degradation rates, maximal levels of degradation ( D max ), and time frame at D max . These degradation metrics show specific PROTAC and family member-dependent responses that are closely associated with the key cellular protein interactions required for the process. Kinetic studies show cellular ternary complex stability influences potency and degradation efficacy. Meanwhile, the level of ubiquitination is highly correlated to degradation rate, indicating ubiquitination stemming from productive ternary complex formation is the main driver of the degradation rate. The approaches applied here highlight the steps at which the choice of E3 ligase handle can elicit different outcomes and discern individual parameters required for degradation, ultimately enabling chemical design strategies and rank ordering of potential therapeutic compounds.

Quantitative Live-Cell Kinetic Degradation and Mechanistic Profiling of PROTAC Mode of Action