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Protein & Peptide Letters

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ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

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Research Article

Unidentified N-glycans by N-glycosidase A were Identified by Nglycosidase F under Denaturing Conditions in Plant Glycoprotein

Author(s): Jeongeun Kim, Jihye Kim, Changsoo Ryu, Jaeryong Lee, Chi Soo Park, Mijung Jin, Minju Kang, Ahyeon Kim, Chulmin Mun and Ha Hyung Kim*

Volume 29, Issue 5, 2022

Published on: 19 May, 2022

Page: [440 - 447] Pages: 8

DOI: 10.2174/0929866529666220328152941

Price: $65

Abstract

Background: The identification of N-glycans in plant glycoproteins or plant-made pharmaceuticals is essential for understanding their structure, function, properties, immunogenicity, and allergenicity (induced by plant-specific core-fucosylation or xylosylation) in the applications of plant food, agriculture, and plant biotechnology. N-glycosidase A is widely used to release the Nglycans of plant glycoproteins because the core-fucosylated N-glycans of plant glycoproteins are hydrolyzed by N-glycosidase A but not by N-glycosidase F. However, the efficiency of Nglycosidase A activity in plant glycoproteins remains unclear.

Objective: The aim of the study was to elucidate the efficient use of N-glycosidases to identify and quantify the N-glycans of plant glycoproteins; it aimed at identification of released N-glycans by Nglycosidase F and assessment of their relative quantities with a focus on unidentified N-glycans by N-glycosidase A in plant glycoproteins, Phaseolus vulgaris lectin (PHA) and horseradish peroxidase (HRP).

Methods: Liquid chromatography–tandem mass spectrometry was used to analyze and compare the N-glycans of PHA and HRP treated with either N-glycosidase A or F under denaturing conditions. The relative quantities (%) of each N-glycan (>0.1%) to the total N-glycans (100%) were determined.

Results: N-glycosidase A and F released 9 identical N-glycans of PHA, but two additional corefucosylated N-glycans were released by only N-glycosidase A, as expected. By contrast, in HRP, 8 N-glycans comprising 6 core-fucosylated N-glycans, 1 xylosylated N-glycan, and 1 mannosylated N-glycan were released by N-glycosidase A. Moreover, 8 unexpected N-glycans comprising 1 corefucosylated N-glycan, 4 xylosylated N-glycans, and 3 mannosylated N-glycans were released by Nglycosidase F. Of these, 3 xylosylated and 2 mannosylated N-glycans were released by only Nglycansodase F.

Conclusion: These results demonstrate that N-glycosidase A alone is insufficient to release the Nglycans of all plant glycoproteins, suggesting that to identify and quantify the released N-glycans of the plant glycoprotein HRP, both N-glycosidase A and F treatments are required.

Keywords: Allergenicity, N-glycan, N-glycosidase, plant glycoprotein, plant biotechnology, mammalian cell cultures.

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