Citation:
MA Cheng, PAN Yiting, ZHANG Qi, WANG Jifeng, QIAN Xiaohong, YING Wantao. Analysis of N-glycosylated protein and N-glycans in human plasma by hydrophilic enrichment strategy[J]. Chinese Journal of Chromatography,
;2013, 31(11): 1057-1063.
doi:
10.3724/SP.J.1123.2013.05043
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N-glycosylation of proteins is one of the most important post-translational modifications (PTM). Many diagnostic biomarkers and therapeutic targets are glycosylated proteins. However, it is still a big challenge to identify glycoproteins in human plasma, because of the high dynamic range and microheterogeneity of glycosylation. In this work, hydrophilic interaction liquid chromatography (HILIC) enrichment, high-pH reversed-phase prefractionation and high accurate mass spectrometry (MS) analysis were combined to profile the N-glycoproteins in human plasma. In total, 637 N-glycosites from 299 glycoproteins (protein groups) were identified. There were also 31 glycoforms recognized after HILIC enrichment and MS analysis. Among the results, 107 glycosylation sites (16.8%) are newly found. This study provided a simple and reliable strategy for exploring potential N-glycoprotein biomarkers from complicated biological systems.
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