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Title: Site-specific N-linked glycosylation analysis of human carcinoembryonic antigen by sheathless capillary electrophoresis-tandem mass spectrometry
Author: Pont Villanueva, Laura
Kuzyk, Valeriia
Benavente Moreno, Fernando J. (Julián)
Sanz Nebot, María Victoria
Mayboroda, O. A.
Wuhrer, Manfred
Lageveen-Kammeijer, G. S. M.
Keywords: Glicoproteïnes
Càncer colorectal
Colorectal cancer
Issue Date: 2021
Publisher: American Chemical Society
Abstract: With 28 potential N-glycosylation sites, human carcinoembryonic antigen (CEA) bears an extreme amount of N-linked glycosylation, and approximately 60% of its molecular mass can be attributed to its carbohydrates. CEA is often overexpressed and released by many solid tumors, including colorectal carcinomas. CEA displays an impressive heterogeneity and variability in sugar content, however site-specific distribution of carbohydrate structures has not been reported so far. The present study investigated CEA samples purified from human colon carcinoma and human liver metastases and enabled the characterization of 21 out of 28 potential N-glycosylation sites with respect to their occupancy. The coverage was achieved by a multi-enzymatic digestion approach with specific enzymes, such as trypsin, endoproteinase Glu-C, and the non-specific enzyme, pronase, followed by analysis using sheathless CE-MS/MS. In total, 893 different N-glycopeptides and 128 unique N-glycan compositions were identified. Overall, a great heterogeneity was found both within (micro) and in between (macro) individual N-glycosylation sites. Moreover, notable differences were found on certain N-glycosylation sites between primary adenocarcinoma and metastatic tumor in regard to branching, bisection, sialylation and fucosylation. Those features, if further investigated in a targeted manner, may pave the way towards improved diagnostics and monitoring of colorectal cancer progression and recurrence. Raw mass spectrometric data and Skyline processed data files that support the findings of this study are available in the MassIVE repository with the identifier MSV000086774 [].
Note: Reproducció del document publicat a:
It is part of: Journal of Proteome Research, 2021, vol. 20, p. 1666-1675
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ISSN: 1535-3893
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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