Homogeneous bispecifics by disulfide bridging

Area of Science:

• Bioconjugation Chemistry
• Protein Engineering
• Immunology

Background:

• Antibody-antibody conjugates are crucial for targeted therapies and diagnostics.
• Current methods for creating homogeneous antibody conjugates can be complex and inefficient.
• Site-specific conjugation is essential for maintaining antibody function and predictability.

Purpose of the Study:

• To develop a novel chemical platform for generating site-specific, homogeneous antibody-antibody conjugates.
• To demonstrate the utility of this platform for creating bispecific antibodies.
• To ensure the retention of antibody binding activity post-conjugation.

Main Methods:

• Utilizing a bis-dibromomaleimide cross-linker to bridge antibody fragment disulfide bonds.
• Employing a simple reduction and bridging process for conjugate formation.
• Characterizing the resulting antibody conjugates for homogeneity and binding activity.

Main Results:

• Successful generation of bispecific antibody constructs with high yield.
• Demonstrated maintenance of antibody binding activity after conjugation.
• Confirmed in vitro binding of target antigens by the generated conjugates.
• Exemplified the technology by linking single-chain variable fragment (scFv) and fragment antigen-binding (Fab) antibody fragments.

Conclusions:

• The developed chemical platform provides an efficient and versatile method for site-specific antibody conjugation.
• This technology facilitates the construction of diverse bispecific antibodies with preserved functionality.
• The approach holds significant potential for advancing antibody-based therapeutics and diagnostics.