Galactose Oxidase Enables Modular Assembly of Conjugates from Native Antibodies with High Drug-to-Antibody Ratios [post]

Antonio Angelastro, Alexey Barkhanskiy, Ashley P. Mattey, Edward G. Pallister, Reynard Spiess, William Goundry, Perdita Barran, Sabine L. Flitsch
2021 unpublished
The potential of antibody conjugates with high drug loading in anticancer therapy has recently been highlighted by the approval of Trastuzumab deruxtecan and Sacituzumab govitecan. These biopharmaceutical approaches have spurred interest in bioconjugation strategies with high and defined degrees antibody-to-drug (DAR) ratios, in particular on native antibodies. Here we report a glycoengineering methodology to generate antibody drug conjugates with DAR of up to eight, by combining highly
more » ... e enzymatic galactosylation and oxidation with biorthogonal tandem Knoevenagel-Michael addition chemistry. This three step approach offers a selective route to conjugates from native antibodies with high drug loading, and thus illustrates how biocatalysis can be used for the generation of biopharmaceuticals using mild reaction conditions.
doi:10.26434/chemrxiv-2021-mr3p9 fatcat:67o4pxcmzvfcvdlt5ooiw4alma