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Metabolic process engineering of Clostridium tyrobutyricum Δ ackadhE2 for enhanced n‐butanol production from glucose: Effects of methyl viologen on NADH availability, flux distribution, and fermentation kinetics

Journal Article · · Biotechnology and Bioengineering
DOI:https://doi.org/10.1002/bit.25489· OSTI ID:1400884
 [1];  [1];  [2];  [2];  [1]
  1. William G. Lowrie Department of Chemical and Biomolecular Engineering The Ohio State University 140 West 19th Avenue Columbus Ohio 43210
  2. Bioprocessing Innovative Company Dublin Ohio
ABSTRACT

Butanol biosynthesis through aldehyde/alcohol dehydrogenase ( adhE2 ) is usually limited by NADH availability, resulting in low butanol titer, yield, and productivity. To alleviate this limitation and improve n‐butanol production by Clostridium tyrobutyricum Δ ack – adhE2 overexpressing adhE2 , the NADH availability was increased by using methyl viologen (MV) as an artificial electron carrier to divert electrons from ferredoxin normally used for H 2 production. In the batch fermentation with the addition of 500 μM MV, H 2 , acetate, and butyrate production was reduced by more than 80–90%, while butanol production increased more than 40% to 14.5 g/L. Metabolic flux analysis revealed that butanol production increased in the fermentation with MV because of increased NADH availability as a result of reduced H 2 production. Furthermore, continuous butanol production of ∼55 g/L with a high yield of ∼0.33 g/g glucose and extremely low ethanol, acetate, and butyrate production was obtained in fed‐batch fermentation with gas stripping for in situ butanol recovery. This study demonstrated a stable and reliable process for high‐yield and high‐titer n‐butanol production by metabolically engineered C. tyrobutyricum by applying MV as an electron carrier to increase butanol biosynthesis. Biotechnol. Bioeng. 2015;112: 705–715. © 2014 Wiley Periodicals, Inc.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AR0000095
OSTI ID:
1400884
Journal Information:
Biotechnology and Bioengineering, Journal Name: Biotechnology and Bioengineering Journal Issue: 4 Vol. 112; ISSN 0006-3592
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United States
Language:
English

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