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Hwang, Dobeen; Tsuji, Kohei; Park, HaJeung; Burke, Terrence R; Rader, Christoph
Bioconjugate chemistry, 11/2019, Letnik: 30, Številka: 11Journal Article
By exploiting a uniquely reactive lysine residue (Lys99) for site-specific attachment of small molecules, the humanized catalytic antibody h38C2 has been used as bioconjugation module in the assembly of chemically programmed antibodies and antibody–drug conjugates. Treatment of h38C2 with β-lactam-functionalized small molecules has been previously shown to result in covalent conjugation by selective formation of a stable amide bond with the ε-amino group of the Lys99 residue. Here we report that heteroaryl methylsulfonyl (MS-PODA)-functionalized small molecules represent an alternative bioconjugation strategy through highly efficient, site-specific, and stable arylation of the Lys99 residue. A set of chemically programmed antibodies and antibody–drug conjugates assembled by Lys99 arylation provided proof-of-concept for the therapeutic utility of this alternative bioconjugation strategy. While being equally effective as β-lactam-functionalized ligands for bioconjugation with catalytic antibody h38C2, the MS-PODA moiety offers distinct synthetic advantages, making it highly attractive.
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