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Metabolically engineered Caldicellulosiruptor bescii as a platform for producing acetone and hydrogen from lignocellulose

Journal Article · · Biotechnology and Bioengineering
DOI:https://doi.org/10.1002/bit.27529· OSTI ID:1786038
 [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Department of Chemical and Biomolecular Engineering North Carolina State University Raleigh North Carolina
  2. Department of Biochemistry and Molecular Biology University of Georgia Athens Georgia
Abstract

The production of volatile industrial chemicals utilizing metabolically engineered extreme thermophiles offers the potential for processes with simultaneous fermentation and product separation. An excellent target chemical for such a process is acetone ( T b  = 56°C), ideally produced from lignocellulosic biomass. Caldicellulosiruptor bescii ( T opt 78°C), an extremely thermophilic fermentative bacterium naturally capable of deconstructing and fermenting lignocellulose, was metabolically engineered to produce acetone. When the acetone pathway construct was integrated into a parent strain containing the bifunctional alcohol dehydrogenase from Clostridium thermocellum , acetone was produced at 9.1 mM (0.53 g/L), in addition to minimal ethanol 3.3 mM (0.15 g/L), along with net acetate consumption. This demonstrates that C. bescii can be engineered with balanced pathways in which renewable carbohydrate sources are converted to useful metabolites, primarily acetone and H 2 , without net production of its native fermentation products, acetate and lactate.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0019391
OSTI ID:
1786038
Alternate ID(s):
OSTI ID: 1853180
Journal Information:
Biotechnology and Bioengineering, Journal Name: Biotechnology and Bioengineering Journal Issue: 12 Vol. 117; ISSN 0006-3592
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United States
Language:
English

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