title: Effect of tungstate on acetate and ethanol production by the electrosynthetic bacterium Sporomusa ovata.
abstract: BACKGROUND
  Microbial electrosynthesis (MES) and gas fermentation are bioenergy technologies in which a microbial catalyst reduces CO2 into organic carbon molecules with electrons from the cathode of a bioelectrochemical system or from gases such as H2. The acetogen Sporomusa ovata has the capacity of reducing CO2 into commodity chemicals by both gas fermentation and MES. Acetate is often the only product generated by S. ovata during autotrophic growth.
  
  
  RESULTS
  In this study, trace elements in S. ovata growth medium were optimized to improve MES and gas fermentation productivity. Augmenting tungstate concentration resulted in a 2.9-fold increase in ethanol production by S. ovata during H2:CO2-dependent growth. It also promoted electrosynthesis of ethanol in a S. ovata-driven MES reactor and increased acetate production 4.4-fold compared to unmodified medium. Furthermore, fatty acids propionate and butyrate were successfully converted to their corresponding alcohols 1-propanol and 1-butanol by S. ovata during gas fermentation. Increasing tungstate concentration enhanced conversion efficiency for both propionate and butyrate. Gene expression analysis suggested that tungsten-containing aldehyde ferredoxin oxidoreductases (AORs) and a tungsten-containing formate dehydrogenase (FDH) were involved in the improved biosynthesis of acetate, ethanol, 1-propanol, and 1-butanol. AORs and FDH contribute to the fatty acids re-assimilation pathway and the Wood-Ljungdahl pathway, respectively.
  
  
  CONCLUSIONS
  This study presented here shows that optimization of microbial catalyst growth medium can improve productivity and lead to the biosynthesis of different products by gas fermentation and MES. It also provides insights on the metabolism of biofuels production in acetogens and demonstrates that S. ovata has an important untapped metabolic potential for the production of other chemicals than acetate via CO2-converting bioprocesses including MES.
authors: The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2970 Hørsholm, Denmark.
authors: Fariza
authors: F
authors: Ammam
authors: The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2970 Hørsholm, Denmark ; School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan, 430070 People's Republic of China.
authors: Pier-Luc
authors: 0000-0002-0230-7837
authors: PL
authors: Tremblay
authors: The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2970 Hørsholm, Denmark.
authors: Dawid M
authors: DM
authors: Lizak
authors: The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2970 Hørsholm, Denmark ; School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan, 430070 People's Republic of China.
authors: Tian
authors: T
authors: Zhang
keywords: Aldehyde ferredoxin oxidoreductase; Gas fermentation; Medium optimization; Microbial electrosynthesis; Sporomusa ovata