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Recent efforts to combat increasing greenhouse gas emissions include their capture into advanced biofuels, such as butanol. Traditionally, biobutanol research has been centered solely on its generation from sugars. Our results show partial re-assimilation of CO 2  and H 2  by n-butanol-producer  C .  beijerinckii . This was detected as synchronous CO 2 /H 2  oscillations by direct (real-time) monitoring of their fermentation gasses. Additional functional analysis demonstrated increased total carbon recovery above heterotrophic values associated to mixotrophic assimilation of synthesis gas (H 2 , CO 2  and CO). This was further confirmed using  13 C-Tracer experiments feeding  13 CO 2  and measuring the resulting labeled products. Genome- and transcriptome-wide analysis revealed transcription of key C-1 capture and additional energy conservation genes, including partial Wood-Ljungdahl and complete reversed pyruvate ferredoxin oxidoreductase / pyruvate-formate-lyase-dependent (rPFOR/Pfl) pathways. Therefore, this report provides direct genetic and physiological evidences of mixotrophic inorganic carbon-capture by  C .  beijerinckii .

Evidence of mixotrophic carbon-capture by n-butanol-producer Clostridium beijerinckii