Modulating the Potency of BRD4 PROTACs at the Systems Level with Amine-Acid Coupling Reactions

Area of Science:

• Medicinal Chemistry
• Chemical Biology
• Drug Discovery

Background:

• Proteolysis targeting chimeras (PROTACs) are heterobifunctional molecules for targeted protein degradation.
• Amide bonds, commonly used in PROTAC synthesis, can lead to suboptimal drug properties.
• Modulating PROTAC properties through reaction conditions offers a systems chemistry approach to therapeutic optimization.

Purpose of the Study:

• To investigate the impact of different amine-acid coupling reactions on PROTAC linker synthesis and properties.
• To evaluate the efficacy of novel PROTACs generated under varied reaction conditions for BRD4 degradation.
• To demonstrate the potential of systems chemistry in optimizing PROTAC-based therapeutics.

Main Methods:

• Synthesis of BRD4 PROTAC degraders using four new amine-acid coupling reactions and a classic amide coupling.
• Characterization of physicochemical properties of PROTACs synthesized under different reaction conditions.
• Assessment of BRD4 degradation efficacy for newly synthesized PROTACs.

Main Results:

• Variations in reaction conditions significantly affected the physicochemical properties of the synthesized PROTACs.
• Several novel PROTACs exhibited enhanced BRD4 degradation efficacy compared to traditional amide-linked PROTACs.
• The study successfully demonstrated that linker properties can be modulated by reaction conditions.

Conclusions:

• Systems chemistry offers a powerful strategy for optimizing PROTAC design and function.
• Novel coupling reactions can yield PROTACs with improved therapeutic potential.
• Tailoring reaction conditions is crucial for developing effective protein degradation therapies.