Antifungal activity of rye (secale cereale) seed chitinases: The different binding manner of class i and class ii chitinases to the fungal cell walls

Toki Taira, Takayuki Ohnuma, Takeshi Yamagami, Yoichi Aso, Masatsune Ishiguro, Masanobu Ishihara

研究成果: ジャーナルへの寄稿学術誌査読

69 被引用数 (Scopus)

抄録

The antifungal activities of rye seed chitinase-a (RSC-a, class I) and -c (RSC-c, class II) were studied in detail using two different bioassays with Trichoderma sp. as well as binding and degradation experiments with the cell walls prepared from its mycelia. RSC-a inhibited more strongly the re-extension of the hyphae, containing mainly mature cells, than RSC-c did. Upon incubation of the fungus with fluorescent chitinases, FITC- labeled RSC-a was found to be located in the hyphal tips, lateral walls, and septa, while FITC-labeled RSC-c was only in the hyphal tip. RSC-a had a greater affinity for the cell walls than RSC-c. RSC-a liberated a larger amount of reducing sugar from the cell walls than RSC-c did. These results inferred that RSC-a first binds to the lateral walls and septa, consisting of the mature cell walls, and degrades mature chitin fiber, while RSC-c binds only to the hyphal tip followed by degradation of only nascent chitin. As a result, RSC-a inhibited fungal growth more effectively than RSC-c. Furthermore, it was suggested that the chitin-binding domain in RSC-a assists the antifungal action of RSC-a by binding to the fungal hypha.

本文言語英語
ページ(範囲)970-977
ページ数8
ジャーナルBioscience, Biotechnology and Biochemistry
66
5
DOI
出版ステータス出版済み - 2002

!!!All Science Journal Classification (ASJC) codes

  • バイオテクノロジー
  • 分析化学
  • 生化学
  • 応用微生物学とバイオテクノロジー
  • 分子生物学
  • 有機化学

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