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Background  Microbial electrosynthesis (MES) and gas fermentation are bioenergy technologies in which a microbial catalyst reduces CO 2  into organic carbon molecules with electrons from the cathode of a bioelectrochemical system or from gases such as H 2 . The acetogen  Sporomusa ovata  has the capacity of reducing CO 2  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 H 2 :CO 2 -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 CO 2 -converting bioprocesses including MES.    Electronic supplementary material  The online version of this article (doi:10.1186/s13068-016-0576-0) contains supplementary material, which is available to authorized users.

Effect of tungstate on acetate and ethanol production by the electrosynthetic bacterium Sporomusa ovata