PROTAC BRD2 BRD4 degrader-1 (compound 15) serves as a potent, selective degrader of BET proteins BRD4 and BRD2, achieving rapid, reversible, and unexpectedly selective elimination of BRD4 and BRD2 compared to BRD3. Its efficacy in suppressing solid tumors manifest with minimal cytotoxic effects. This compound comprises a BET inhibitor, a connecting linker, and thalidomide as the ligand for cereblon (CRBN) cullin 4A[1].
KB02-JQ1 is a potent and specific proteolysis targeting chimera (PROTAC) that specifically degrades BRD4, acting as a molecular glue. It does not degrade BRD2 or BRD3. The mechanism of action involves covalent modification of the E3 ligase DCAF16, thereby promoting BRD4 degradation. Importantly, KB02-JQ1 demonstrates enhanced stability and durability in facilitating protein degradation within biological systems. The compound forms a complex with the ubiquitin E3 ligase ligand KB02 through a linker, resulting in the formation of KB02-JQ1[1].
Thalidomide-NH-C4-NH2 TFA (compound 29c) is a conjugate consisting of an E3 ligase ligand-linker, incorporating the Thalidomide-based cereblon ligand and a linker moiety. This compound, Thalidomide-NH-C4-NH2 TFA, is utilized as a component in PROTAC BRD2 BRD4 degrader-1, which is a highly potent and selective degrader targeting BET proteins BRD4 and BRD2[1].