CHO-C-PEG2-C-CHO

This PROTAC linker, CHO-C-PEG2-C-CHO, is a PEG-based dialdehyde designed to connect protein-binding ligands through aldehyde handles, enabling formation of stable conjugates used in targeted protein degradation workflows. Its flexible ethylene glycol spacer supports productive linker geometry and can improve solubility, which is often beneficial for PROTAC synthesis and subsequent biochemical testing. The following sections describe the linker’s structure and the practical reactivity considerations for constructing PROTAC architectures in detail below.

Structure: CHO-C-PEG2-C-CHO is a polyethylene glycol spacer bearing two aldehyde termini. It contains ether linkages characteristic of PEG flexibility, with aldehyde functional groups capable of reversible carbonyl chemistry. The linker is expected to exhibit enhanced hydrophilicity and conformational adaptability relative to rigid linkers.

Reactivity: The aldehydes are suited for carbonyl-based conjugation strategies commonly used in PROTAC assembly, including formation of imines or related reversible adducts with amino-bearing partners, followed by stabilization where appropriate. Typical conditions rely on mild bases or controlled pH to promote condensation, with polar solvents that solubilize PEG linkers and reactive partners. Reaction progress is monitored by standard analytical methods, and purification is performed to remove unreacted aldehyde.