Structural Features of N-Glycans of Seaweed Glycoproteins : Predominant Occurrence of High-Mannose Type N-Glycans in Marine Plants

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  • YOSHIIE Takeo
    Department of Biofunctional Chemistry, Graduate School of Natural Science and Technology, Okayama University Department of Biofunctional Chemistry, Graduate School of Natural Science and Technology, Okayama University
  • MAEDA Megumi
    Department of Biofunctional Chemistry, Graduate School of Natural Science and Technology, Okayama University Department of Biofunctional Chemistry, Graduate School of Environmental and Life Science, Okayama University Department of Biofunctional Chemistry, Graduate School of Natural Science and Technology, Okayama University Department of Biofunctional Chemistry, Graduate School of Environmental and Life Science, Okayama University
  • KIMURA Mariko
    Faculty of Food Culture, Department of Nutrition, Kurashiki Sakuyo University Faculty of Food Culture, Department of Nutrition, Kurashiki Sakuyo University
  • HAMA Yoichiro
    Department of Applied Biological Sciences, Faculty of Agriculture, Saga University Department of Applied Biological Sciences, Faculty of Agriculture, Saga University
  • UCHIDA Motoharu
    National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency
  • KIMURA Yoshinobu
    Department of Biofunctional Chemistry, Graduate School of Natural Science and Technology, Okayama University Department of Biofunctional Chemistry, Graduate School of Environmental and Life Science, Okayama University Department of Biofunctional Chemistry, Graduate School of Natural Science and Technology, Okayama University Department of Biofunctional Chemistry, Graduate School of Environmental and Life Science, Okayama University

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  • Structural Features of <i>N</i>-Glycans of Seaweed Glycoproteins: Predominant Occurrence of High-Mannose Type <i>N</i>-Glycans in Marine Plants

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We analyzed structural features of N-glycans linked to glycoproteins expressed in various seaweeds to identify new sources of biologically-important N-glycans or N-glycopeptides. Structural analysis of the N-glycans of glycopeptides prepared from pepsin digests of 15 species of seaweed revealed that only high-mannose type N-glycans occur in seaweed glycoproteins, and the Man9GlcNAc2 structure predominates in Sargassum fulvellum and Zostera marina, while no typical plant complex type N-glycans bearing β1-2 xylosyl and α1-3 fucosyl residues present in either algae or seagrass. These results indicate that seaweeds lack the activities of several of the glycosyltransferases required for the biosynthesis of the complex type N-glycans found in terrestrial plants, and that the context of N-glycan processing in seaweeds is different from that in terrestrial plant cells.

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