Antibody functionalization with a dual reactive hydrazide/click crosslinker.

Area of Science:

• Bioconjugation Chemistry
• Antibody Engineering
• Glycan Modification

Background:

• Antibody functionalization is crucial for developing diagnostics and therapeutics.
• Existing methods for antibody modification can be complex or lack specificity.
• There is a need for versatile and efficient crosslinking reagents.

Purpose of the Study:

• To synthesize and characterize a novel water-soluble, dual reactive crosslinker (ethynyl hydrazide, EH).
• To demonstrate the utility of EH for modifying antibodies, specifically human immunoglobulin G (hIgG).
• To showcase the application of EH in antibody labeling and immobilization.

Main Methods:

• Synthesis and characterization of ethynyl hydrazide (EH).
• Ethynylation of hIgG via oxidation and reaction with the hydrazide moiety of EH.
• Functionalization of terminal alkyne on hIgG using Cu(I)-catalyzed azide-alkyne cycloaddition (click chemistry).
• Fluorophore labeling and antibody immobilization experiments.

Main Results:

• Successful synthesis and characterization of the EH crosslinker.
• Efficient conjugation of terminal alkyne to hIgG glycans.
• Quantitative and bioorthogonal functionalization of ethynylated hIgG via click chemistry.
• Demonstrated potential for fluorophore labeling and antibody immobilization.

Conclusions:

• Ethynyl hydrazide is a versatile and effective crosslinker for antibody functionalization.
• The dual reactive nature of EH, combining hydrazide and click functionalities, simplifies bioconjugation.
• This approach offers a robust platform for antibody-based applications, including diagnostics and therapeutics.