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Although it has been found that plant endo-beta-N-acetylglucosaminidase shows strong activity towards denatured glycoproteins and glycopeptides with high-mannose type N-glycans and free high-mannose type N-glycans bearing the chitobiosyl unit, the endogenous substrates for plant endoglycosidase have not yet been identified. Recently we purified and characterized an endo-beta-N-acetylglucosaminidase from rice culture cells and identified the gene encoded. Furthermore, we found structural features of free N-glycans in the cells, indicating that high-mannose type species (Man(9-5)GlcNAc(1)) occur at concentration of several micromolar (microM). Hence, in this study we analyzed glycoform of N-glycans linked to glycoproteins expressed in rice culture cells to see whether endogenous glycoproteinous substrate occurs in reasonable amounts. Structural analysis revealed that more than 95% of total N-glycans linked to glycoproteins in the rice cells had the plant complex type structure, including Lewis a epitope-harboring type, although high-mannose type structures account for less than 5% of total N-glycans.

Glycoform Analysis ofN-Glycans Linked to Glycoproteins Expressed in Rice Culture Cells: Predominant Occurrence of Complex TypeN-Glycans