A Reactive Antibody Platform for One-Step Production of Antibody–Drug Conjugates through a Diels–Alder Reaction with Maleimide

The normal electron-demand Diels–Alder (DA) cycloaddition is a classic transformation routinely used in synthesis; however, applications in biological systems are limited. Here, we report a spiro[2.4]­hepta-4,6-diene-containing noncanonical amino acid (SCpHK) capable of efficient incorporation into...

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Veröffentlicht in:Bioconjugate chemistry 2019-09, Vol.30 (9), p.2340-2348
Hauptverfasser: St. Amant, Andre H, Huang, Fengying, Lin, Jia, Lemen, Daniel, Chakiath, Chacko, Mao, Shenlan, Fazenbaker, Christine, Zhong, Haihong, Harper, Jay, Xu, Wenshu, Patel, Neki, Adams, Lauren, Vijayakrishnan, Balakumar, Howard, Philip W, Marelli, Marcello, Wu, Herren, Gao, Changshou, Read de Alaniz, Javier, Christie, R. James
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Sprache:eng
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Zusammenfassung:The normal electron-demand Diels–Alder (DA) cycloaddition is a classic transformation routinely used in synthesis; however, applications in biological systems are limited. Here, we report a spiro[2.4]­hepta-4,6-diene-containing noncanonical amino acid (SCpHK) capable of efficient incorporation into antibodies and subsequent coupling with maleimide via a DA reaction. SCpHK was stable throughout protein expression in mammalian cells and enabled covalent attachment of maleimide drug-linkers yielding DA antibody–drug conjugates (DA-ADCs) with nearly quantitative conversion in a one-step process. The uncatalyzed DA reaction between SCpHK and maleimide in aqueous buffer was rapid (1.8–5.4 M–1 s–1), and the antibody–drug adduct was stable in rat serum for at least 1 week at 37 °C. Anti-EphA2 DA-ADCs containing AZ1508 or SG3249 maleimide drug-linkers were potent inhibitors of tumor growth in PC3 tumor models in vivo. The DA bioconjugation strategy described here represents a simple method to produce site-specific and stable ADCs with maleimide drug-linkers.
ISSN:1043-1802
1520-4812
DOI:10.1021/acs.bioconjchem.9b00436