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Simultaneous glycosylation analysis of human serum glycoproteins by high-performance liquid chromatography/tandem mass spectrometry.

Harazono A, Kawasaki N, Itoh S, Hashii N, Matsuishi-Nakajima Y, Kawanishi T, Yamaguchi T

Division of Biological Chemistry and Biologicals, National Institute of Health Sciences, 1-18-1 Kami-yoga, Setagaya-Ku, Tokyo 158-8501, Japan.

Changes in the glycosylation of some serum proteins are associated with certain diseases. In this study, we performed simultaneous site-specific glycosylation analysis of abundant serum glycoproteins by LC/Qq-TOF MS of human serum tryptic digest, the albumin of which was depleted. The glycopeptide peaks on the chromatogram were basically assigned by database searching with modified peak-list text files of MS/MS spectra and then based on mass differences of glycan units from characterized glycopeptides. Glycopeptide of IgG, haptoglobin and ceruloplasmin were confirmed by means of a comparison of their retention times and m/z values with those obtained by LC/MS of commercially available glycoproteins. Mass spectrometric carbohydrate heterogeneity in the assigned glycopeptides was analyzed by an additional LC/MS. We successfully demonstrated site-specific glycosylation of 23 sites in abundant serum glycoproteins.

Published 16 June 2008 in J Chromatogr B Analyt Technol Biomed Life Sci, 869(1): 20-30.
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