A high performance Trichoderma reesei strain that reveals the importance of xylanase III in cellulosic biomass conversion

Hikaru Nakazawa, Tetsushi Kawai, Noriko Ida, Yosuke Shida, Kouki Shioya, Yoshinori Kobayashi, Hirofumi Okada, Shuji Tani, Jun ichi Sumitani, Takashi Kawaguchi, Yasushi Morikawa, Wataru Ogasawara

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The ability of the Trichoderma reesei X3AB1strain enzyme preparations to convert cellulosic biomass into fermentable sugars is enhanced by the replacement of xyn3 by Aspergillus aculeatus β-glucosidase 1 gene (aabg1), as shown in our previous study. However, subsequent experiments using T. reesei extracts supplemented with the glycoside hydrolase (GH) family 10 xylanase III (XYN III) and GH Family 11 XYN II showed increased conversion of alkaline treated cellulosic biomass, which is rich in xylan, underscoring the importance of XYN III. To attain optimal saccharifying potential in T. reesei, we constructed two new strains, C1AB1 and E1AB1, in which aabg1 was expressed heterologously by means of the cbh1 or egl1 promoters, respectively, so that the endogenous XYN III synthesis remained intact. Due to the presence of wild-type xyn3 in T. reesei E1AB1, enzymes prepared from this strain were 20-30% more effective in the saccharification of alkaline-pretreated rice straw than enzyme extracts from X3AB1, and also outperformed recent commercial cellulase preparations. Our results demonstrate the importance of XYN III in the conversion of alkaline-pretreated cellulosic biomass by T. reesei.

Original languageEnglish
Pages (from-to)89-95
Number of pages7
JournalEnzyme and Microbial Technology
Volume82
DOIs
Publication statusPublished - 2016 Jan 1

Keywords

  • Biomass
  • Cellulase
  • GHF 10 xylanase
  • Trichoderma
  • β-Glucosidase

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biochemistry
  • Applied Microbiology and Biotechnology

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  • Cite this

    Nakazawa, H., Kawai, T., Ida, N., Shida, Y., Shioya, K., Kobayashi, Y., Okada, H., Tani, S., Sumitani, J. I., Kawaguchi, T., Morikawa, Y., & Ogasawara, W. (2016). A high performance Trichoderma reesei strain that reveals the importance of xylanase III in cellulosic biomass conversion. Enzyme and Microbial Technology, 82, 89-95. https://doi.org/10.1016/j.enzmictec.2015.08.019