NH2-PEG5-OH is a PEG-based PROTAC linker that can be used in the synthesis of PROTACs[1]. NH2-PEG5-OH is also a non-cleavable 5 unit PEG ADC linker used in the synthesis of antibody-drug conjugates (ADCs)[2].
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].ADCs are comprised of an antibody to which is attached an ADC cytotoxin through an ADC linker[2].
[1]. Nathanael Gray, et al. Bifunctional molecules for degradation of egfr and methods of use. WO2017185036A1. [2]. Nianhe Han, et al. Derivatives of dolastatin 10 and uses thereof. WO2016192527A1.