title: Development of Solid-Phase Site-Specific Conjugation and Its Application toward Generation of Dual Labeled Antibody and Fab Drug Conjugates.
abstract: The focus of the antibody-drug conjugate (ADC) field is shifting toward development of site-specific, next-generation ADCs to address the issue of heterogeneity, metabolic instability, conjugatability, and less than ideal therapeutic index associated with the conventional (heterogeneous) ADCs. It is evident from the recent literature that the site of conjugation, the structure of the linker, and the physicochemical properties of the linker-payload all have a significant impact on the safety and efficacy of the resulting ADCs. Screening multiple linker-payloads on multiple sites of an antibody presents a combinatorial problem that necessitates high-throughput conjugation and purification methodology to identify ADCs with the best combination of site and payload. Toward this end, we developed a protein A/L-based solid-phase, site-specific conjugation and purification method that can be used to generate site-specific ADCs in a 96-well plate format. This solid-phase method has been shown to be versatile because of its compatibility with various conjugation functional handles such as maleimides, haloacetamides, copper free click substrates, and transglutaminase substrates. The application of this methodology was further expanded to generate dual labeled, site-specific antibody and Fab conjugates.
authors.affiliation: Worldwide Medicinal Chemistry, Pfizer Global R&D , Groton, Connecticut 06340, United States.
authors.forename: Sujiet
authors.initials: S
authors.lastname: Puthenveetil
authors.affiliation: Pfizer Oncology-Rinat R&D , 401 North Middletown Road, Pearl River, New York 10965, United States.
authors.forename: Sylvia
authors.initials: S
authors.lastname: Musto
authors.affiliation: Pfizer Oncology-Rinat R&D , 401 North Middletown Road, Pearl River, New York 10965, United States.
authors.forename: Frank
authors.initials: F
authors.lastname: Loganzo
authors.affiliation: Worldwide Medicinal Chemistry, Pfizer Global R&D , Groton, Connecticut 06340, United States.
authors.forename: L Nathan
authors.initials: LN
authors.lastname: Tumey
authors.affiliation: Worldwide Medicinal Chemistry, Pfizer Global R&D , Groton, Connecticut 06340, United States.
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: O'Donnell
authors.affiliation: Worldwide Medicinal Chemistry, Pfizer Global R&D , Groton, Connecticut 06340, United States.
authors.forename: Edmund
authors.initials: E
authors.lastname: Graziani
mesh_terms: D000906:Antibodies / Q000737:chemistry*; D018796:Immunoconjugates / Q000737:chemistry*; D007140:Immunoglobulin Fab Fragments / Q000737:chemistry*
chemical_list: D000906:Antibodies; D018796:Immunoconjugates; D007140:Immunoglobulin Fab Fragments