An amino acid-based heterofunctional cross-linking reagent

Area of Science:

• Bioconjugation Chemistry
• Medicinal Chemistry
• Organic Synthesis

Background:

• Developing novel cross-linking reagents is crucial for advancing bioconjugation techniques.
• Existing methods may lack specificity or require harsh conditions for modifying biomolecules.
• Lysine-based scaffolds offer versatile platforms for designing functionalized linkers.

Purpose of the Study:

• To synthesize and characterize a novel lysine-based heterofunctional cross-linking reagent.
• To enable bioorthogonal modification of ketones and aldehydes via oxime bond formation.
• To demonstrate the utility of the linker in creating drug conjugates for antibody bioconjugation.

Main Methods:

• Synthesis of a lysine derivative featuring two aminooxy groups and a protected thiol.
• Activation of the thiol group for disulfide bond formation.
• Coupling of doxorubicin to the amino acid core.
• Bioconjugation of the doxorubicin-linker construct to a thiolated antibody.

Main Results:

• Successful synthesis and characterization of the new lysine-based cross-linker.
• Demonstration of bioorthogonal oxime bond formation using the aminooxy functionalities.
• Efficient coupling of two doxorubicin molecules to the linker.
• Successful bioconjugation of the doxorubicin conjugate to a thiolated antibody.

Conclusions:

• The developed lysine-based heterofunctional cross-linker is effective for bioorthogonal modification.
• The reagent facilitates the creation of antibody-drug conjugates with potential therapeutic applications.
• This linker provides a versatile tool for diverse bioconjugation strategies.