Resolving and Assigning N-Linked Glycan Structural Isomers from Ovalbumin by IMS-MS

Manolo D. Plasencia, Dragan Isailovic, Samuel I. Merenbloom, Yehia Mechref, David E. Clemmer

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113 Scopus citations


Ion mobility-mass spectrometry (IMS-MS) and molecular modeling techniques have been used to characterize ovalbumin N-linked glycans. Some glycans from this glycoprotein exist as multiple isomeric forms. The gas-phase separation makes it possible to resolve some isomers before MS analysis. Comparisons of experimental cross sections for selected glycan isomers with values that are calculated for iterative structures generated by molecular modeling techniques allow the assignment of sharp features to specific isomers. We focus here on an example glycan set, each having a m/z value of 1046.52 with formula [H5N4 + 2Na]2+, where H corresponds to a hexose, and N to a N-acetylglucosamine. This glycan appears to exist as three different isomeric forms that are assignable based on comparisons of measured and calculated cross sections. We estimate the relative ratios of the abundances of the three isomers to be in the range of ∼1.0:1.35:0.85 to ∼1.0:1.5:0.80. In total, IMS-MS analysis of ovalbumin N-linked glycans provides evidence for 19 different glycan structures corresponding to high-mannose and hybrid type carbohydrates with a total of 42 distinct features related to isomers and/or conformers.

Original languageEnglish
Pages (from-to)1706-1715
Number of pages10
JournalJournal of the American Society for Mass Spectrometry
Issue number11
StatePublished - Nov 2008


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