Amino-PEG10-amine

This Amino-PEG10-amine linker is a polyethylene glycol-based bifunctional reagent designed to connect a ligand for a target protein to an E3 ligase ligand in PROTAC architectures. Its flexible, hydrophilic spacer can help tune linker length and conformational freedom, supporting efficient formation of productive ternary complexes. The following sections describe the structure and the practical reactivity considerations for constructing PROTAC conjugates.

Structure: The linker contains a PEG backbone bearing terminal primary amine groups, providing a flexible, water-compatible scaffold. It features repeating ether linkages that confer conformational mobility and polarity, with primary amines suitable for amide or urea formation. Overall, it behaves as a bifunctional spacer for conjugation chemistry.

Reactivity: Terminal amines enable coupling via amide-forming reactions with activated carboxylic acids (such as NHS esters or activated acid derivatives) or via carbodiimide-mediated amidation under standard peptide-coupling conditions. For urea linkage strategies, isocyanate or activated carbamoyl intermediates can react with the amines. Typical solvents include polar aprotic media, and mild base/acid buffers are chosen to preserve ligand integrity while promoting selective bond formation.