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Systems biology-guided biodesign of consolidated lignin conversion

Journal Article · · Green Chemistry
DOI:https://doi.org/10.1039/C6GC01131D· OSTI ID:1326560
 [1];  [2];  [3];  [2];  [2];  [4];  [2];  [2];  [4];  [2];  [5];  [2]
  1. Texas A & M Univ., College Station, TX (United States); Zhejiang Univ., Hangzhou (China)
  2. Texas A & M Univ., College Station, TX (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Michigan State Univ., East Lansing, MI (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Lignin is the second most abundant biopolymer on the earth, yet its utilization for fungible products is complicated by its recalcitrant nature and remains a major challenge for sustainable lignocellulosic biorefineries. In this study, we used a systems biology approach to reveal the carbon utilization pattern and lignin degradation mechanisms in a unique lignin-utilizing Pseudomonas putida strain (A514). The mechanistic study further guided the design of three functional modules to enable a consolidated lignin bioconversion route. First, P. putida A514 mobilized a dye peroxidase-based enzymatic system for lignin depolymerization. This system could be enhanced by overexpressing a secreted multifunctional dye peroxidase to promote a two-fold enhancement of cell growth on insoluble kraft lignin. Second, A514 employed a variety of peripheral and central catabolism pathways to metabolize aromatic compounds, which can be optimized by overexpressing key enzymes. Third, the β-oxidation of fatty acid was up-regulated, whereas fatty acid synthesis was down-regulated when A514 was grown on lignin and vanillic acid. Therefore, the functional module for polyhydroxyalkanoate (PHA) production was designed to rechannel β-oxidation products. As a result, PHA content reached 73% per cell dry weight (CDW). Further integrating the three functional modules enhanced the production of PHA from kraft lignin and biorefinery waste. Furthermore, this study elucidated lignin conversion mechanisms in bacteria with potential industrial implications and laid out the concept for engineering a consolidated lignin conversion route.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1326560
Journal Information:
Green Chemistry, Journal Name: Green Chemistry; ISSN GRCHFJ; ISSN 1463-9262
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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A promiscuous cytochrome P450 aromatic O-demethylase for lignin bioconversion journal June 2018
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Synergistic maximization of the carbohydrate output and lignin processability by combinatorial pretreatment journal January 2017
Bioprocess development for muconic acid production from aromatic compounds and lignin journal January 2018
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Lignin catabolic pathways reveal unique characteristics of dye‐decolorizing peroxidases in Pseudomonas putida journal March 2019
Metabolic engineering of Pseudomonas putida for increased polyhydroxyalkanoate production from lignin journal January 2020
Bacterial catabolism of lignin-derived aromatics: New findings in a recent decade: Update on bacterial lignin catabolism: Bacterial catabolism of lignin-derived aromatics journal November 2017
Combinatorial pretreatment and fermentation optimization enabled a record yield on lignin bioconversion journal January 2018
Genomic and proteomic analysis of lignin degrading and polyhydroxyalkanoate accumulating β-proteobacterium Pandoraea sp. ISTKB journal June 2018
Recent advances in lignin valorization with bacterial cultures: microorganisms, metabolic pathways, and bio-products journal February 2019
Discovery of potential pathways for biological conversion of poplar wood into lipids by co-fermentation of Rhodococci strains journal March 2019

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