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Characterization and Detection of Erythropoietin Fc Fusion Proteins Using Liquid Chromatography-Mass Spectrometry.
Journal of Proteome Research 2018 January 6
Erythropoietin Fc (EPO-Fc) fusion proteins are potential drug candidates that have been designed for the treatment of anemia in humans by stimulating erythrocyte production. Such compounds can be considered performance-enhancing agents that may be used by athletes in endurance sports. This study describes the primary structure of commercially available EPO-Fc based on comprehensive liquid chromatography coupled with mass spectrometry (LC-MS) analysis. A bottom-up approach and the intact molecular weight (MW) measurement of deglycosylated protein and its IdeS proteolytic fractions was used to determine the amino acid sequence of EPO-Fc. Using multiple proteases, peptides covering unknown fusion breakpoints (spacer peptides) were identified. We demonstrated that "spacer peptides" can be used in the determination of EPO-Fc fusion proteins in biological samples using common LC-tandem MS methods.
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