Fmoc-N-methyl-PEG3-CH2CH2COOH is a cleavable ADC linker used in the synthesis of antibody-drug conjugates (ADCs). Fmoc-N-methyl-PEG3-CH2CH2COOH is also a PEG-based PROTAC linker that can be used in the synthesis of PROTACs[1].
ADCs are comprised of an antibody to which is attached an ADC cytotoxin through an ADC linker.
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]. Yang Y,et al. Design, synthesis, and biological characterization of novel PEG-linked dimeric modulators for CXCR4. Bioorg Med Chem. 2016 Nov 1;24(21):5393-5399.