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Title: Fermentation of dilute acid pretreated Populus by Clostridium thermocellum, Caldicellulosiruptor bescii, and Caldicellulosiruptor obsidiansis

Journal Article · · BioEnergy Research
 [1];  [2];  [3];  [4];  [2];  [2];  [2];  [5]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Genomatica Inc., San Diego, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Dessert Research Institute, Las Vegas, NV (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); White Cliff Biosystems, Rockwood, TN (United States)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1221721
Journal Information:
BioEnergy Research, Vol. 8, Issue 3; Conference: San Jose, California United States, 8-13 June 2014; ISSN 1939-1234
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

References (43)

The Path Forward for Biofuels and Biomaterials journal January 2006
Ethanol Can Contribute to Energy and Environmental Goals journal January 2006
Potential Synergies and Challenges in Refining Cellulosic Biomass to Fuels, Chemicals, and Power journal April 2003
Ethanol fermentation from biomass resources: current state and prospects journal December 2005
Lignin modification improves fermentable sugar yields for biofuel production journal June 2007
Genetic modification of lignin biosynthesis for improved biofuel production journal May 2009
Outlook for cellulase improvement: Screening and selection strategies journal September 2006
The challenge of enzyme cost in the production of lignocellulosic biofuels journal November 2011
Microbial Cellulose Utilization: Fundamentals and Biotechnology journal December 2002
Consolidated bioprocessing of cellulosic biomass: an update journal October 2005
Process Design and Costing of Bioethanol Technology: A Tool for Determining the Status and Direction of Research and Development journal October 1999
Recent progress in consolidated bioprocessing journal June 2012
Thermophilic lignocellulose deconstruction journal May 2014
Impact of Pretreated Switchgrass and Biomass Carbohydrates on Clostridium thermocellum ATCC 27405 Cellulosome Composition: A Quantitative Proteomic Analysis journal April 2009
Conversion for Avicel and AFEX pretreated corn stover by Clostridium thermocellum and simultaneous saccharification and fermentation: Insights into microbial conversion of pretreated cellulosic biomass journal September 2011
Extremely thermophilic microorganisms for biomass conversion status and prospects journal June 2008
Clostridium thermocellum transcriptomic profiles after exposure to furfural or heat stress journal January 2013
Cellulase, Clostridia, and Ethanol journal March 2005
High Ethanol Titers from Cellulose by Using Metabolically Engineered Thermophilic, Anaerobic Microbes journal September 2011
Genetic manipulation of lignin reduces recalcitrance and improves ethanol production from switchgrass journal February 2011
Consolidated bioprocessing of transgenic switchgrass by an engineered and evolved Clostridium thermocellum strain journal January 2014
Single-step ethanol production from lignocellulose using novel extremely thermophilic bacteria journal January 2013
Thermophilic biohydrogen production from energy plants by Caldicellulosiruptor saccharolyticus and comparison with related studies journal May 2009
Biohydrogen Production from Biomass and Wastes via Dark Fermentation: A Review journal February 2010
Efficient hydrogen production from the lignocellulosic energy crop Miscanthus by the extreme thermophilic bacteria Caldicellulosiruptor saccharolyticus and Thermotoga neapolitana journal January 2009
A quantitative analysis of hydrogen production efficiency of the extreme thermophile Caldicellulosiruptor owensensis OLT journal February 2010
Methylation by a Unique α-class N4-Cytosine Methyltransferase Is Required for DNA Transformation of Caldicellulosiruptor bescii DSM6725 journal August 2012
Construction of a Stable Replicating Shuttle Vector for Caldicellulosiruptor Species: Use for Extending Genetic Methodologies to Other Members of This Genus journal May 2013
Overcoming restriction as a barrier to DNA transformation in Caldicellulosiruptor species results in efficient marker replacement journal January 2013
Metabolic engineering of Caldicellulosiruptor bescii yields increased hydrogen production from lignocellulosic biomass journal January 2013
Direct conversion of plant biomass to ethanol by engineered Caldicellulosiruptor bescii journal June 2014
Label-free Quantitative Proteomics for the Extremely Thermophilic Bacterium Caldicellulosiruptor obsidiansis Reveal Distinct Abundance Patterns upon Growth on Cellobiose, Crystalline Cellulose, and Switchgrass journal December 2011
Use of Label-Free Quantitative Proteomics To Distinguish the Secreted Cellulolytic Systems of Caldicellulosiruptor bescii and Caldicellulosiruptor obsidiansis journal April 2011
Caldicellulosiruptor obsidiansis sp. nov., an Anaerobic, Extremely Thermophilic, Cellulolytic Bacterium Isolated from Obsidian Pool, Yellowstone National Park journal December 2009
Degradation of high loads of crystalline cellulose and of unpretreated plant biomass by the thermophilic bacterium Caldicellulosiruptor bescii journal January 2014
Evaluation of the bioconversion of genetically modified switchgrass using simultaneous saccharification and fermentation and a consolidated bioprocessing approach journal January 2012
Global transcriptome analysis of Clostridium thermocellum ATCC 27405 during growth on dilute acid pretreated Populus and switchgrass journal January 2013
Kinetic modeling of batch fermentation for Populus hydrolysate tolerant mutant and wild type strains of Clostridium thermocellum journal November 2013
Carbohydrate and lignin are simultaneously solubilized from unpretreated switchgrass by microbial action at high temperature journal January 2013
The exometabolome of Clostridium thermocellum reveals overflow metabolism at high cellulose loading journal October 2014
Closing the carbon balance for fermentation by Clostridium thermocellum (ATCC 27405) journal January 2012
Deposition of Lignin Droplets Produced During Dilute Acid Pretreatment of Maize Stems Retards Enzymatic Hydrolysis of Cellulose journal December 2007
Access of cellulase to cellulose and lignin for poplar solids produced by leading pretreatment technologies journal May 2009

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