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Title: Development of Rhodococcus opacus as a chassis for lignin valorization and bioproduction of high-value compounds

Journal Article · · Biotechnology for Biofuels

The current extraction and use of fossil fuels has been linked to extensive negative health and environmental outcomes. Lignocellulosic biomass-derived biofuels and bioproducts are being actively considered as renewable alternatives to the fuels, chemicals, and materials produced from fossil fuels. A major challenge limiting large-scale, economic deployment of second-generation biorefineries is the insufficient product yield, diversity, and value that current conversion technologies can extract from lignocellulose, in particular from the underutilized lignin fraction. Rhodococcus opacus PD630 is an oleaginous gram-positive bacterium with innate catabolic pathways and tolerance mechanisms for the inhibitory aromatic compounds found in depolymerized lignin, as well as native or engineered pathways for hexose and pentose sugars found in the carbohydrate fractions of biomass. As a result, R. opacus holds potential as a biological chassis for the conversion of lignocellulosic biomass into biodiesel precursors and other value-added products. This review begins by examining the important role that lignin utilization will play in the future of biorefineries and by providing a concise survey of the current lignin conversion technologies. The genetic machinery and capabilities of R. opacus that allow the bacterium to tolerate and metabolize aromatic compounds and depolymerized lignin are also discussed, along with a synopsis of the genetic toolbox and synthetic biology methods now available for engineering this organism. Finally, we summarize the different feedstocks that R. opacus has been demonstrated to consume, and the high-value products that it has been shown to produce. Engineered R. opacus will enable lignin valorization over the coming years, leading to cost-effective conversion of lignocellulose into fuels, chemicals, and materials.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0018324
OSTI ID:
1612925
Journal Information:
Biotechnology for Biofuels, Vol. 12, Issue 1; ISSN 1754-6834
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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  • Suwaleerat, Tharatron; Thanapimmetha, Anusith; Srisaiyoot, Maythee
  • Journal of Chemical Technology & Biotechnology, Vol. 93, Issue 8 https://doi.org/10.1002/jctb.5554
journal February 2018
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Metabolic engineering of Corynebacterium glutamicum for the production of cis, cis-muconic acid from lignin journal July 2018
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Rhodococcus bacteria as a promising source of oils from olive mill wastes journal July 2018
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Development of Chemical and Metabolite Sensors for Rhodococcus opacus PD630 journal June 2017
Comparative transcriptomics elucidates adaptive phenol tolerance and utilization in lipid-accumulating Rhodococcus opacus PD630 journal February 2016
Pathways for degradation of lignin in bacteria and fungi journal January 2011
Directed bioconversion of Kraft lignin to polyhydroxyalkanoate by Cupriavidus basilensis B-8 without any pretreatment journal January 2017
Multi-omic elucidation of aromatic catabolism in adaptively evolved Rhodococcus opacus journal September 2018
Pyrolysis of Wood/Biomass for Bio-oil: A Critical Review journal May 2006
Lipid Production from Dilute Alkali Corn Stover Lignin by Rhodococcus Strains journal January 2017
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Triacylglycerol Production from Corn Stover Using a Xylose-Fermenting Rhodococcus opacus Strain for Lignocellulosic Biofuels journal January 2014
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Peak oil, 20 years later: Failed prediction or useful insight? journal February 2019
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