Tr-PEG5-OH is a non-cleavable 5 unit PEG ADC linker used in the synthesis of antibody-drug conjugates (ADCs). Tr-PEG5-OH is a PEG-based PROTAC linker can be used in the synthesis of PROTACs.
ADCs are comprised of an antibody to which is attached an ADC cytotoxin through an ADC linker[1].
PROTACs contain two different ligands connected by a linker; one is a ligand for an E3 ubiquitin ligase and the other is for the target protein. PROTACs exploit the intracellular ubiquitin-proteasome system to selectively degrade target proteins[1].
[1]. Branderhorst HM, et al. Strong inhibition of cholera toxin binding by galactose dendrimers. Chem Commun (Camb). 2007 Dec 21;(47):5043-5.
[2]. An S, et al. Small-molecule PROTACs: An emerging and promising approach for the development of targeted therapy drugs. EBioMedicine. 2018 Oct;36:553-562.