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Consolidated bioprocessing (CBP), which merges enzyme production, biomass hydrolysis, and fermentation into a single step, has the potential to become an efficient and economic strategy for the bioconversion of lignocellulosic feedstocks to transportation fuels or chemicals. In this study, we evaluated wild-type , , and , three thermophilic, cellulolytic, mixed-acid fermenting candidate CBP microorganisms, for their fermentation capabilities using dilute acid pretreated  as a model biomass feedstock. Under pH-controlled anaerobic fermentation conditions, each candidate successfully digested a minimum of 75 % of the cellulose from dilute acid pretreated , as indicated by an increase in planktonic cells and end-product metabolites and a concurrent decrease in glucan content. , which employs a cellulosomal approach to biomass degradation, required approximately 50 h to achieve 75 % cellulose utilization. In contrast, the noncellulosomal, secreted hydrolytic enzyme system of the  sp. required about 100 h after a significant lag phase to achieve similar results. End-point fermentation conversions for , , and  were determined to be 0.29, 0.34, and 0.38 g of total metabolites per gram of loaded glucan, respectively. These data provide a starting point for future strain engineering efforts that can serve to improve the biomass fermentation capabilities of these three promising candidate CBP platforms.

Fermentation of Dilute Acid Pretreated Populus by Clostridium thermocellum, Caldicellulosiruptor bescii, and Caldicellulosiruptor obsidiansis