Isolation,Characterization,and Sugar Chain Structure of EndoPG 1a,1b,and 1c from Stereum purpureum

  • HASUI Yuji
    Department of Bioresources Science, Faculty of Agriculture, Hirosaki University
  • FUKUI Yohko
    Department of Bioresources Science, Faculty of Agriculture, Hirosaki University
  • KIKUCHI Junko
    Department of Bioresources Science, Faculty of Agriculture, Hirosaki University
  • KATO Nozomu
    Department of Bioresources Science, Faculty of Agriculture, Hirosaki University
  • MIYAIRI Kazuo
    Department of Bioresources Science, Faculty of Agriculture, Hirosaki University
  • OKUNO Toshikatsu
    Department of Bioresources Science, Faculty of Agriculture, Hirosaki University

書誌事項

タイトル別名
  • Isolation, Characterization, and Sugar Chain Structure of EndoPG Ia, Ib, and Ic from Stereum purpureum.
  • IsolationCharacterizationand Sugar Chai
  • Isolation, Characterization, and Sugar Chain Structure of EndoPG Ia, Ib, and Ic from<i>Stereum purpureum</i>

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抄録

  Three endopolygalacturonases (endoPG Ia, Ib, and Ic) were isolated from the culture filtrate of Stereum purpureum, the causative fungus of apple silver-leaf disease. Their properties, including specific activities, optimum pHs, thermal stabilities, and kinetic parameters (Km and Vmax) were compared. Their properties were very similar to one another except for the substrate specificity and relative molecular mass. The sugar chains of endoPG Is were released by hydrazinolysis, and one major sugar chain common to endoPG Is was isolated. The pyridylamino sugar was characterized by a two-dimensional mapping method using HPLC, and identified as a high mannose type N-linked sugar chain, Manα1-6(Manα1-3)Manα1-6(Manα1-3) Manβ1-4GlcNAcβ1-4 GlcNAc (designated as M5.1). Observation of the course of Western blot analysis for the proteins from the culture filtrate with endoPG I antibodies showed that the fungus secreted three endoPG Is into the culture broth during the growing period.<br>

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