Application of Trichoderma reesei cellulase and xylanase promoters through homologous recombination for enhanced production of extracellular beta-glucosidase I

Zinnia Rahman, Yosuke Shida, Takanori Furukawa, Yota Suzuki, Hirofumi Okada, Wataru Ogasawara, Yasushi Morikawa

Research output: Contribution to journalArticlepeer-review

Abstract

One of the limiting factors for the application of Trichoderma reesei to degrade cellulosic biomass is its low beta-glucosidase activity, required to convert cellobiose to glucose. The egl3 and the xyn3 promoters were used to express beta-glucosidase 1 gene bgl1 through homologous recombination to improve the cellulose degradation ability of T. reesei. The recombinant strains expressing beta-glucosidase 1 (BGLI) under the control of either the egl3 or the xyn3 promoter had 4.0 and 7.5 fold higher beta-glucosidase activity than the native strain, which compares well to the finding that in wild-type T. reesei PC-3-7, the levels of egl3 and xyn3 mRNA expression were 6.0 and 12 fold higher respectively than that of bgl1. Matrix assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry analysis of proteins secreted by the recombinant strains demonstrated that BGLI was overproduced. The increase in the transcription of bgl1 and the concomitant elevated level of BGLI in these recombinant strains were sufficient to degrade the cellobiose and cellotriose formed during the degradation of pretreated cedar powder.

Original languageEnglish
Pages (from-to)1083-1089
Number of pages7
JournalBioscience, biotechnology, and biochemistry
Volume73
Issue number5
DOIs
Publication statusPublished - May 2009

Keywords

  • Animals
  • Cattle
  • Cedrus
  • Cellobiose
  • Cellulase
  • Extracellular Space
  • Gene Expression Profiling
  • Promoter Regions, Genetic
  • Protein Engineering
  • RNA, Messenger
  • Trichoderma
  • Xylosidases
  • beta-Glucosidase
  • Journal Article
  • Research Support, Non-U.S. Gov't

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