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Engineering the N-terminal end of CelA results in improved performance and growth of Caldicellulosiruptor bescii on crystalline cellulose

Journal Article · · Biotechnology and Bioengineering
DOI:https://doi.org/10.1002/bit.26242· OSTI ID:1349022
 [1];  [2];  [2];  [2];  [1]
  1. Univ. of Georgia, Athens, GA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
Here, CelA is the most abundant enzyme secreted by Caldicellulosiruptor bescii and has been shown to outperform mixtures of commercially available exo- and endoglucanases in vitro. CelA contains both a glycoside hydrolase family 9 endoglucanase and a glycoside hydrolase family 48 exoglucanase known to be synergistic in their activity, connected by three cellulose-binding domains via linker peptides. Here, repeated aspartate residues were introduced into the N-terminal ends of CelA GH9 and GH48 domains to improve secretion efficiency and/or catalytic efficiency of CelA. Among several constructs, the highest activity on carboxymethylcellulose (CMC), 0.81 ± 0.03 mg/mL was observed for the C. bescii strain containing CelA with 5-aspartate tag at the N-terminal end of GH9 domain – an 82% increase over wild type CelA. In addition, Expression of CelA with N-terminal repeated aspartate residues in C. bescii results in a dramatic increase in its ability to grow on Avicel.
Research Organization:
NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1349022
Alternate ID(s):
OSTI ID: 1401885
Report Number(s):
NREL/JA--2700-67747
Journal Information:
Biotechnology and Bioengineering, Journal Name: Biotechnology and Bioengineering Journal Issue: 5 Vol. 114; ISSN 0006-3592
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Progress in understanding and overcoming biomass recalcitrance: a BioEnergy Science Center (BESC) perspective journal November 2017
Genetically Engineered Proteins to Improve Biomass Conversion: New Advances and Challenges for Tailoring Biocatalysts journal August 2019
Engineering cellulolytic bacterium Clostridium thermocellum to co-ferment cellulose- and hemicellulose-derived sugars simultaneously journal April 2018
High-level constitutive expression of leech hyaluronidase with combined strategies in recombinant Pichia pastoris journal January 2020
Genomic and physiological analyses reveal that extremely thermophilic Caldicellulosiruptor changbaiensis deploys uncommon cellulose attachment mechanisms journal August 2019
Genome Stability in Engineered Strains of the Extremely Thermophilic Lignocellulose-Degrading Bacterium Caldicellulosiruptor bescii journal May 2017

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