Abstract
Bispecifc antibodies (bsAbs) are emerging as a promising new class of biotherapeutics. Although Ig domain fusion by DNA engineering is the prevalent methodology for producing bsAbs, a significant number of studies are being performed with chemically crosslinked Abs. By using different starting material and various conjugation strategies, bispecific fragments, full-length Abs, or combinations thereof can be generated. Two types or crosslinkers are used for the generation of bsAbs: hetero- or homobifunctional. Here we compare the pros and cons of the two types and we describe the use of the crosslinkers succinimidyl -3(2-pyridylthiol)propionate (SPDP), Traut’s reagent,sulpho-[succinimidyl-4-(N-maleimidomethyl)-4-cyclohexane-1-carboxylate] (SMCC), o-phenylenedimaleimide (o-PDM). We also review the clinical studies carried out with some of the products generated by these methodologies. The main hurdle for the transfer of chemically conjugated bsAbs to clinical applications has been the low yield and heterogeneity of the products. In this chapter we describe the generation of bisFabs, crosslinked Fabs with engineered Cys residues, to improve the efficiency and quality of bsAbs. We also discuss the use of non-natural amino acids along with click chemistry reactions and other approaches for the addition of new functionalities into bsAbs. These new technologies may help to improve both the yield and the homogeneity of bsAbs as well as their pharmacokinetics properties, paving the way for future clinical applications.
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We thank Dr. Byoung-Chul Lee for critically reading the manuscript.
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Ellerman, D., Scheer, J.M. (2011). Generation of Bispecific Antibodies by Chemical Conjugation. In: Kontermann, R. (eds) Bispecific Antibodies. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20910-9_3
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DOI: https://doi.org/10.1007/978-3-642-20910-9_3
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