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- W2912373464 abstract "Glycoproteomic analyses of tryptic (glyco)peptides from wild-type (WT) porcine IgG were performed. In a first protocol, intact antibody was digested with trypsin, followed by glycopeptide enrichment and liquid chromatography-tandem MS (HPLC–MS/MS). This procedure allowed to detect N-glycopeptides observed previously (Lopez, P. G. et al., Glycoconj. J. 2016, 33 (1), 79), plus other non-reported N-glycopeptides. The method provided useful information but did not allow to discern between Fab (antigen-binding region) and Fc (constant region, fragment crystallizable) peptides/glycopeptides. In a second scheme, glycoproteomic analysis was attempted for Fab and Fc fragments obtained by papain and Fabulous™ hydrolysis. Usually employed for milligram amounts of antibodies, the papain and Fabulous™ protocols were adapted to 200 μg of WT IgG. Fab and Fc fragments were separated by size-exclusion (SEC) HPLC. Fractions collected were reanalyzed by gel electrophoresis (SDS-PAGE). Bands were excised, and fragments digested in-gel, followed by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) MS and HPLC/MS–MS. In the protocol no glycopeptide enrichment was involved, that is, whole tryptic digests were analyzed. Fc N-glycopeptides were identified, and greater numbers of non-glycosylated peptides were tabulated. Very few peptides overlapped between Fc and Fab, as most peptides were clearly from Fc or Fab. HPLC-MS/MS detected more sialylated glycoforms than MALDI-TOF-MS. Sections of Fab and Fc were assigned de novo, through a database search or manually." @default.
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- W2912373464 date "2019-04-10" @default.
- W2912373464 modified "2023-10-03" @default.
- W2912373464 title "Characterization of Whole and Fragmented Wild-Type Porcine IgG" @default.
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- W2912373464 doi "https://doi.org/10.5772/intechopen.82792" @default.
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