Confident O-glycosylation Site Identification for ENBREL (etanercept) Using the ECD Functionality of SELECT SERIES Cyclic IMS System
Characterization of glycosylation on the glycopeptide level can be challenging with traditional peptide mapping methods that employ reversed-phase liquid chromatography coupled with tandem mass spectrometry (RPLC-MS/MS or MSE). These methods typically employ collision induced dissociation (CID) as the fragmentation technique, which has limitations for site specific analysis of labile modifications. The use of Electron Capture Dissociation (ECD) enables glycan moieties to be retained on the peptide backbone, and allow the site to be confidently assigned using the resulting fragment ions. In this study, we demonstrate the utility of ECD on the SELECT SERIES Cyclic IMS instrument for unambiguous assignment of glycosylation site locations for 11 O-glycopeptide species of ENBREL (etanercept).
