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Title: Heterologous expression of a β-d-glucosidase in Caldicellulosiruptor bescii has a surprisingly modest effect on the activity of the exoproteome and growth on crystalline cellulose

Abstract

Members of the genus Caldicellulosiruptor are the most thermophilic cellulolytic bacteria so far described and are capable of efficiently utilizing complex lignocellulosic biomass without conventional pretreatment. Previous studies have shown that accumulation of high concentrations of cellobiose and, to a lesser extent, cellotriose, inhibits cellulase activity both in vivo and in vitro and high concentrations of cellobiose are present in C. bescii fermentations after 90 h of incubation. For some cellulolytic microorganisms, β-d-glucosidase is essential for the efficient utilization of cellobiose as a carbon source and is an essential enzyme in commercial preparations for efficient deconstruction of plant biomass. In spite of its ability to grow efficiently on crystalline cellulose, no extracellular β-d-glucosidase or its GH1 catalytic domain could be identified in the C. bescii genome. In order to investigate whether the addition of a secreted β-d-glucosidase would improve growth and cellulose utilization by C. bescii, we also cloned and expressed a thermostable β-d-glucosidase from Acidothermus cellulolyticus (Acel_0133) in C. bescii using the CelA signal sequence for protein export. The effect of this addition was modest, suggesting that ..beta..-d-glucosidase is not rate limiting for cellulose deconstruction and utilization by C. bescii.

Authors:
 [1];  [2];  [2];  [2];  [1]
  1. Univ. of Georgia, Athens, GA (United States). Dept. of Genetics; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center; National Renewable Energy Lab. (NREL), Golden, CO (United States). Biosciences Center
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1399844
Report Number(s):
NREL/JA-2700-70290
Journal ID: ISSN 1367-5435
Grant/Contract Number:  
AC36-08GO28308; AC05-00Or22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Industrial Microbiology and Biotechnology
Additional Journal Information:
Journal Volume: 44; Journal Issue: 12; Journal ID: ISSN 1367-5435
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; 60 APPLIED LIFE SCIENCES; consolidated bioprocessing; biomass deconstruction; Caldicellulosiruptor

Citation Formats

Kim, Sun-Ki, Chung, Daehwan, Himmel, Michael E., Bomble, Yannick J., and Westpheling, Janet. Heterologous expression of a β-d-glucosidase in Caldicellulosiruptor bescii has a surprisingly modest effect on the activity of the exoproteome and growth on crystalline cellulose. United States: N. p., 2017. Web. doi:10.1007/s10295-017-1982-4.
Kim, Sun-Ki, Chung, Daehwan, Himmel, Michael E., Bomble, Yannick J., & Westpheling, Janet. Heterologous expression of a β-d-glucosidase in Caldicellulosiruptor bescii has a surprisingly modest effect on the activity of the exoproteome and growth on crystalline cellulose. United States. doi:10.1007/s10295-017-1982-4.
Kim, Sun-Ki, Chung, Daehwan, Himmel, Michael E., Bomble, Yannick J., and Westpheling, Janet. Sat . "Heterologous expression of a β-d-glucosidase in Caldicellulosiruptor bescii has a surprisingly modest effect on the activity of the exoproteome and growth on crystalline cellulose". United States. doi:10.1007/s10295-017-1982-4. https://www.osti.gov/servlets/purl/1399844.
@article{osti_1399844,
title = {Heterologous expression of a β-d-glucosidase in Caldicellulosiruptor bescii has a surprisingly modest effect on the activity of the exoproteome and growth on crystalline cellulose},
author = {Kim, Sun-Ki and Chung, Daehwan and Himmel, Michael E. and Bomble, Yannick J. and Westpheling, Janet},
abstractNote = {Members of the genus Caldicellulosiruptor are the most thermophilic cellulolytic bacteria so far described and are capable of efficiently utilizing complex lignocellulosic biomass without conventional pretreatment. Previous studies have shown that accumulation of high concentrations of cellobiose and, to a lesser extent, cellotriose, inhibits cellulase activity both in vivo and in vitro and high concentrations of cellobiose are present in C. bescii fermentations after 90 h of incubation. For some cellulolytic microorganisms, β-d-glucosidase is essential for the efficient utilization of cellobiose as a carbon source and is an essential enzyme in commercial preparations for efficient deconstruction of plant biomass. In spite of its ability to grow efficiently on crystalline cellulose, no extracellular β-d-glucosidase or its GH1 catalytic domain could be identified in the C. bescii genome. In order to investigate whether the addition of a secreted β-d-glucosidase would improve growth and cellulose utilization by C. bescii, we also cloned and expressed a thermostable β-d-glucosidase from Acidothermus cellulolyticus (Acel_0133) in C. bescii using the CelA signal sequence for protein export. The effect of this addition was modest, suggesting that ..beta..-d-glucosidase is not rate limiting for cellulose deconstruction and utilization by C. bescii.},
doi = {10.1007/s10295-017-1982-4},
journal = {Journal of Industrial Microbiology and Biotechnology},
number = 12,
volume = 44,
place = {United States},
year = {2017},
month = {9}
}

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