Fermentation of dilute acid pretreated Populus by Clostridium thermocellum, Caldicellulosiruptor bescii, and Caldicellulosiruptor obsidiansis
Abstract
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 Clostridium thermocellum, Caldicellulosiruptor bescii, and Caldicellulosiruptor obsidiansis, three , thermophilic,cellulolytic, mixed-acid fermenting candidate CBP microorganisms, for their fermentation capabilities using dilute acid pretreated Populus 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 Populus, as indicated by an increase in planktonic cells and end-product metabolites and a concurrent decrease in glucan content. C. thermocellum, which employs a cellulosomal approach to biomass degradation, required 120 hours to achieve 75% cellulose utilization. In contrast, the non-cellulosomal, secreted hydrolytic enzyme system of the Caldicellulosiruptor sp. required 300 hours to achieve similar results. End-point fermentation conversions for C. thermocellum, C. bescii, and C. obsidiansis were determined to be 0.29, 0.34, and 0.38 grams of total metabolites per gram of loaded glucan, respectively. This data provide a starting point for future strain engineering efforts that can serve to improve the biomass fermentation capabilities of these three promisingmore »
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Genomatica Inc., San Diego, CA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Dessert Research Institute, Las Vegas, NV (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); White Cliff Biosystems, Rockwood, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1221721
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- BioEnergy Research
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 3; Conference: San Jose, California United States, 8-13 June 2014; Journal ID: ISSN 1939-1234
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 09 BIOMASS FUELS; consolidated bioprocessing; Clostridia thermocellum; Caldicellulosiruptor; Caldicellulosiruptor bescii; dilute acid pretreated Populus; thermophilic fermentation
Citation Formats
Yee, Kelsey L., Rodriguez, Jr., Miguel, Hamilton, Choo Yieng, Hamilton-Brehm, Scott D., Thompson, Olivia A., Elkins, James G., Davison, Brian H., and Mielenz, Jonathan R. Fermentation of dilute acid pretreated Populus by Clostridium thermocellum, Caldicellulosiruptor bescii, and Caldicellulosiruptor obsidiansis. United States: N. p., 2015.
Web. doi:10.1007/s12155-015-9659-1.
Yee, Kelsey L., Rodriguez, Jr., Miguel, Hamilton, Choo Yieng, Hamilton-Brehm, Scott D., Thompson, Olivia A., Elkins, James G., Davison, Brian H., & Mielenz, Jonathan R. Fermentation of dilute acid pretreated Populus by Clostridium thermocellum, Caldicellulosiruptor bescii, and Caldicellulosiruptor obsidiansis. United States. https://doi.org/10.1007/s12155-015-9659-1
Yee, Kelsey L., Rodriguez, Jr., Miguel, Hamilton, Choo Yieng, Hamilton-Brehm, Scott D., Thompson, Olivia A., Elkins, James G., Davison, Brian H., and Mielenz, Jonathan R. 2015.
"Fermentation of dilute acid pretreated Populus by Clostridium thermocellum, Caldicellulosiruptor bescii, and Caldicellulosiruptor obsidiansis". United States. https://doi.org/10.1007/s12155-015-9659-1. https://www.osti.gov/servlets/purl/1221721.
@article{osti_1221721,
title = {Fermentation of dilute acid pretreated Populus by Clostridium thermocellum, Caldicellulosiruptor bescii, and Caldicellulosiruptor obsidiansis},
author = {Yee, Kelsey L. and Rodriguez, Jr., Miguel and Hamilton, Choo Yieng and Hamilton-Brehm, Scott D. and Thompson, Olivia A. and Elkins, James G. and Davison, Brian H. and Mielenz, Jonathan R.},
abstractNote = {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 Clostridium thermocellum, Caldicellulosiruptor bescii, and Caldicellulosiruptor obsidiansis, three , thermophilic,cellulolytic, mixed-acid fermenting candidate CBP microorganisms, for their fermentation capabilities using dilute acid pretreated Populus 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 Populus, as indicated by an increase in planktonic cells and end-product metabolites and a concurrent decrease in glucan content. C. thermocellum, which employs a cellulosomal approach to biomass degradation, required 120 hours to achieve 75% cellulose utilization. In contrast, the non-cellulosomal, secreted hydrolytic enzyme system of the Caldicellulosiruptor sp. required 300 hours to achieve similar results. End-point fermentation conversions for C. thermocellum, C. bescii, and C. obsidiansis were determined to be 0.29, 0.34, and 0.38 grams of total metabolites per gram of loaded glucan, respectively. This 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.},
doi = {10.1007/s12155-015-9659-1},
url = {https://www.osti.gov/biblio/1221721},
journal = {BioEnergy Research},
issn = {1939-1234},
number = 3,
volume = 8,
place = {United States},
year = {Sat Jul 25 00:00:00 EDT 2015},
month = {Sat Jul 25 00:00:00 EDT 2015}
}
Web of Science
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