Abstract
N-Glycans are posttranslational modifications of proteins attached to the amide side chains of asparagine residues, with possible heterogeneity due to different structures being possible at the same glycosylation site. In contrast to the mammalian systems, invertebrate N-glycosylation presents a challenge in analysis as there exist unfamiliar epitopes and a high degree of structural and isomeric variation between different species. A simple analytical approach to analyze N-glycans on specific glycoproteins is presented, which involves a combination of tryptic peptide mass spectrometry and “off-line” RP-HPLC MALDI-TOF MS/MS complemented by blotting to recognize specific epitopes. An additional N-glycan enrichment and labeling step can facilitate the analysis of single structures and even provide isomeric separation of N-glycans from specific proteins.
Full data on the N-glycans of honeybee royal jelly will appear in a forthcoming paper: Hykollari et al. 2018. Isomeric separation and recognition of anionic and zwitterionic N-glycans from royal jelly glycoproteins.
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Abbreviations
- DTT:
-
Dithiothreitol
- HRP:
-
Horseradish peroxidase
- MALDI-TOF:
-
MS matrix-assisted laser-desorption/ionization time-of-flight mass spectrometry
- NPGC:
-
Nonporous graphitized carbon
- PC:
-
Phosphorylcholine
- PE:
-
Phosphoethanolamine
- RP-HPLC:
-
Reversed phase high pressure liquid chromatography
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
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Acknowledgments
This work was supported by the Austrian Fonds zur Förderung der wissenschaftlichen Forschung (FWF; grants P26662, P25058, and P23922 to A.H., K.P, and I.B.H.W.).
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Hykollari, A., Malzl, D., Wilson, I.B.H., Paschinger, K. (2019). Protein-Specific Analysis of Invertebrate Glycoproteins. In: Wang, X., Kuruc, M. (eds) Functional Proteomics. Methods in Molecular Biology, vol 1871. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-8814-3_24
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DOI: https://doi.org/10.1007/978-1-4939-8814-3_24
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