Propargyl-PEG4-acid is a PEG-based PROTAC linker can be used in the synthesis of BTK-IAP PROTACs Ibrutinib -based PROTAC 2 and an analogue PROTAC 3. PROTAC 3 causes BTK degradation with a DC50 of 200 nM in THP-1 cells[1].
Lenalidomide-PEG3-iodine, an E3 ligase ligand-linker conjugate, consists of a cereblon-based Lenalidomide ligand and a 3-unit polyethylene glycol (PEG) linker. This compound is utilized in creating various proteolysis targeting chimeras (PROTACs), including the highly effective PROTAC BTK degrader SJF620, which has a degradation concentration 50 (DC50) of 7.9 nM[1].