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Development of a cellulolytic Saccharomyces cerevisiae strain with enhanced cellobiohydrolase activity

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Abstract

Consolidated bioprocessing (CBP) is a promising technology for lignocellulosic ethanol production, and the key is the engineering of a microorganism that can efficiently utilize cellulose. Development of Saccharomyces cerevisiae for CBP requires high level expression of cellulases, particularly cellobiohydrolases (CBH). In this study, to construct a CBP-enabling yeast with enhanced CBH activity, three cassettes containing constitutively expressed CBH-encoding genes (cbh1 from Aspergillus aculeatus, cbh1 and cbh2 from Trichoderma reesei) were constructed. T. reesei eg2, A. aculeatus bgl1, and the three CBH-encoding genes were then sequentially integrated into the S. cerevisiae W303-1A chromosome via δ-sequence-mediated integration. The resultant strains W1, W2, and W3, expressing uni-, bi-, and trifunctional cellulases, respectively, exhibited corresponding cellulase activities. Furthermore, both the activities and glucose producing activity ascended. The growth test on cellulose containing plates indicated that CBH was a necessary component for successful utilization of crystalline cellulose. The three recombinant strains and the control strains W303-1A and AADY were evaluated in acid- and alkali-pretreated corncob containing media with 5 FPU exogenous cellulase/g biomass loading. The highest ethanol titer (g/l) within 7 days was 5.92 ± 0.51, 18.60 ± 0.81, 28.20 ± 0.84, 1.40 ± 0.12, and 2.12 ± 0.35, respectively. Compared with the control strains, W3 efficiently fermented pretreated corncob to ethanol. To our knowledge, this is the first study aimed at creating cellulolytic yeast with enhanced CBH activity by integrating three types of CBH-encoding gene with a strong constitutive promoter Ptpi.

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Authors and Affiliations

  1. Tianjin R&D Center for Petrochemical Technology, Tianjin University, Tianjin, 300072, China

    Jiefang Hong, Huajun Yang, Kun Zhang, Cheng Liu, Shaolan Zou & Minhua Zhang

  2. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China

    Jiefang Hong & Huajun Yang

Authors
  1. Jiefang Hong
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  2. Huajun Yang
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  3. Kun Zhang
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  4. Cheng Liu
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  5. Shaolan Zou
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  6. Minhua Zhang
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Corresponding author

Correspondence to Shaolan Zou.

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Jiefang Hong and Huajun Yang have contributed equally to this work.

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Hong, J., Yang, H., Zhang, K. et al. Development of a cellulolytic Saccharomyces cerevisiae strain with enhanced cellobiohydrolase activity. World J Microbiol Biotechnol 30, 2985–2993 (2014). https://doi.org/10.1007/s11274-014-1726-9

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  • DOI: https://doi.org/10.1007/s11274-014-1726-9

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