Substantial decrease in cell wall α-1,3-glucan caused by disruption of the kexB gene encoding a subtilisin-like processing protease in Aspergillus oryzae

Osamu Mizutani, Matsuko Shiina, Akira Yoshimi, Motoaki Sano, Takeshi Watanabe, Youhei Yamagata, Tasuku Nakajima, Katsuya Gomi, Keietsu Abe

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Disruption of the kexB encoding a subtilisin-like processing protease in Aspergillus oryzae (ΔkexB) leads to substantial morphological defects when the cells are grown on Czapek-Dox agar plates. We previously found that the disruption of kexB causes a constitutive activation of the cell wall integrity pathway. To understand how the disruption of the kexB affects cell wall organization and components, we analyzed the cell wall of ΔkexB grown on the plates. The results revealed that both total N- Acetylglucosamine content, which constitutes chitin, and chitin synthase activities were increased. Whereas total glucose content, which constitutes β-1,3-glucan and α-1,3-glucan, was decreased; this decrease was attributed to a remarkable decrease in α-1,3-glucan. Additionally, the β-1,3-glucan in the alkali-insoluble fraction of the ΔkexB showed a high degree of polymerization. These results suggested that the loss of α-1,3-glucan in the ΔkexB was compensated by increases in the chitin content and the average degree of β-1,3-glucan polymerization.

Original languageEnglish
Pages (from-to)1781-1791
Number of pages11
JournalBioscience, Biotechnology and Biochemistry
Volume80
Issue number9
DOIs
Publication statusPublished - 2016

Keywords

  • 3-glucan
  • Aspergillus oryzae
  • Cell wall integrity
  • Processing protease (KexB)
  • α-1

ASJC Scopus subject areas

  • Biotechnology
  • Analytical Chemistry
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Organic Chemistry

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