Characterization of glycopeptides by combining collision-induced dissociation and electron-transfer dissociation mass spectrometry data

William R. Alley, Yehia Mechref, Milos V. Novotny

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

Structural characterization of a glycopeptide is not easily attained through collision-induced dissociation (CID), due to the extensive fragmentation of glycan moieties and minimal fragmentation of peptide backbones. In this study, we have exploited the potential of electron-transfer dissociation (ETD) as a complementary approach for peptide fragmentation. Model glycoproteins, including ribonuclease B, fetuin, horseradish peroxidase, and haptoglobin, were used here. In ETD, radical anions transfer an electron to the peptide backbone and induce cleavage of the N-Cα bond. The glycan moiety is retained on the peptide backbone, being largely unaffected by the ETD process. Accordingly, ETD allows not only the identification of the amino acid sequence of a glycopeptide, but also the unambiguous assignment of its glycosylation site. When data acquired from both fragmentation techniques are combined, it is possible to characterize comprehensively the entire glycopeptide. This is being achieved with a mass spectrometer capable of alternating between CID and ETD on-the-fly during an LC/MS/MS analysis. This is demonstrated here with several tryptic glycopeptides.

Original languageEnglish
Pages (from-to)161-170
Number of pages10
JournalRapid Communications in Mass Spectrometry
Volume23
Issue number1
DOIs
StatePublished - Jan 2009

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