DBCO-PEG-Ala-Ala-Asn-PAB-OH

Dibenzocyclooctyne-functionalized discrete poly(ethylene glycol)-alanyl-alanyl-asparagine-p-aminobenzyl alcohol (DBCO-PEG-Ala-Ala-Asn-PAB-OH) is an ADC linker intermediate containing a defined-length PEG spacer. It contains a dibenzocyclooctyne (DBCO) reactive terminus and an alanine–alanine–asparagine tripeptide. Discrete chain lengths with different degrees of polymerization are available. The strained DBCO alkyne can undergo copper-free click reactions with azides, enabling attachment to molecules or materials with preinstalled azide sites. The alanine–alanine–asparagine tripeptide provides a sequence variable for studies of protease-cleavable linkers. The PAB spacer links peptide cleavage to the subsequent self-immolation process. The PAB hydroxyl group retains a synthetic handle for subsequent activation and payload derivatization.

Customization available.