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• W4280515206 abstract "Antibody-drug conjugates (ADCs) hold great promise for targeted cancer cell killing. Site-specific antibody-drug conjugation is highly desirable for synthesizing homogeneous ADCs with optimal safety profiles and high efficacy. We have recently reported that azide-functionalized disaccharide oxazolines of the Manβ1,4GlcNAc core were an efficient substrate of wild-type endoglycosidase Endo-S2 for Fc glycan remodeling and conjugation. In this paper, we report the synthesis and evaluation of new disaccharide oxazolines as enzyme substrates for examining the scope of the site-specific conjugation. Thus, azide-functionalized disaccharide oxazolines derived from Manβ1,4GlcNAc, Glcβ1,4GlcNAc, and Galβ1,4GlcNAc (LacNAc) were synthesized. Enzymatic evaluation revealed that wild-type Endo-S2 demonstrated highly relaxed substrate specificity and could accommodate all the three types of disaccharide derivatives for transglycosylation to provide site-specific azide-tagged antibodies, which were readily clicked with a payload to generate homogeneous ADCs. Moreover, we also found that Endo-S2 was able to accommodate drug-preloaded minimal disaccharide oxazolines as donor substrates for efficient glycan transfer, enabling a single-step and site-specific antibody-drug conjugation without the need of an antibody click reaction. The ability of Endo-S2 to accommodate simpler and more easily synthesized disaccharide oxazoline derivatives for Fc glycan remodeling further expanded the scope of this bioconjugation method for constructing homogeneous antibody-drug conjugates in a single-step manner. Finally, cell-based assays indicated that the synthetic homogeneous ADCs demonstrated potent targeted cancer cell killing." @default.
• W4280515206 created "2022-05-22" @default.
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• W4280515206 date "2022-05-11" @default.
• W4280515206 modified "2023-09-26" @default.
• W4280515206 title "Synthesis and Evaluation of Three Azide-Modified Disaccharide Oxazolines as Enzyme Substrates for Single-Step Fc Glycan-Mediated Antibody-Drug Conjugation" @default.
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• W4280515206 doi "https://doi.org/10.1021/acs.bioconjchem.2c00142" @default.
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