Changes in Structural Features of Free N-Glycan and Endoglycosidase Activity during Tomato Fruit Ripening
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概要
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In developing plants, free N-glycans occur ubiquitously at micromolar concentrations. Such oligosaccharides have been proposed to be signaling molecules in plant development. As a part of a study to elucidate the physiological roles of de-N-glycosylation machinery involved in fruit ripening, we analyzed changes in the amounts and structural features of free N-glycans in tomato fruits at four ripening stages. The amount of high-mannose type free N-glycans increased significantly in accordance with fruit ripening, and the relative amounts of high-molecular size N-glycans, such as Man8-9GlcNAc1, became predominant. These observations suggest that the de-N-glycosylation machinery, including endo-β-N-acetylglucosaminidase (ENGase) activity, is stimulated in the later stages of fruit ripening. But contrary to expectation, we found that total ENGase activities in the tomato fruits did not vary significantly with the ripening process, suggesting that ENGase activity must be maintained at a certain level, and that the expression of α-mannosidase involved in the clearance of free N-glycans decreases during tomato fruit ripening.
- 社団法人 日本農芸化学会の論文
著者
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INOUE Masami
Department of Hematology/Oncology, Osaka Medical Center, Research Institute for Maternal and Child H
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KIMURA Yoshinobu
Department of Bioresources Chemistry, Faculty of Agriculture, Okayama University
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Nakamura Kosuke
Department of Biofunctional Chemistry, Graduate School of Natural Science and Technology, Okayama Un
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YOSHIIE Takeo
Department of Bioresources Chemistry, Faculty of Agriculture, Okayama University
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HOSOI Katsutoshi
Kagome Research Institute, Kagome Co., Ltd.
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