A Thermophilic Ionic Liquid-Tolerant Cellulase Cocktail for the Production of Cellulosic Biofuels
Abstract
Generation of biofuels from sugars in lignocellulosic biomass is a promising alternative to liquid fossil fuels, but efficient and inexpensive bioprocessing configurations must be developed to make this technology commercially viable. One of the major barriers to commercialization is the recalcitrance of plant cell wall polysaccharides to enzymatic hydrolysis. Biomass pretreatment with ionic liquids (ILs) enables efficient saccharification of biomass, but residual ILs inhibit both saccharification and microbial fuel production, requiring extensive washing after IL pretreatment. Pretreatment itself can also produce biomass-derived inhibitory compounds that reduce microbial fuel production. Therefore, there are multiple points in the process from biomass to biofuel production that must be interrogated and optimized to maximize fuel production. Here, we report the development of an IL-tolerant cellulase cocktail by combining thermophilic bacterial glycoside hydrolases produced by a mixed consortia with recombinant glycoside hydrolases. This enzymatic cocktail saccharifies IL-pretreated biomass at higher temperatures and in the presence of much higher IL concentrations than commercial fungal cocktails. Sugars obtained from saccharification of IL-pretreated switchgrass using this cocktail can be converted into biodiesel (fatty acid ethyl-esters or FAEEs) by a metabolically engineered strain of E. coli. During these studies, we found that this biodiesel-producing E. coli strain was sensitivemore »
- Authors:
-
- Sandia National Lab. (SNL-CA), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23), Biological Systems Science Division (SC-23.2 )
- OSTI Identifier:
- 1511337
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- PLoS ONE
- Additional Journal Information:
- Journal Volume: 7; Journal Issue: 5; Journal ID: ISSN 1932-6203
- Publisher:
- Public Library of Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 09 BIOMASS FUELS
Citation Formats
Park, Joshua I., Steen, Eric J., Burd, Helcio, Evans, Sophia S., Redding-Johnson, Alyssa M., Batth, Tanveer, Benke, Peter I., D'haeseleer, Patrik, Sun, Ning, Sale, Kenneth L., Keasling, Jay D., Lee, Taek Soon, Petzold, Christopher J., Mukhopadhyay, Aindrila, Singer, Steven W., Simmons, Blake A., and Gladden, John M. A Thermophilic Ionic Liquid-Tolerant Cellulase Cocktail for the Production of Cellulosic Biofuels. United States: N. p., 2012.
Web. doi:10.1371/journal.pone.0037010.
Park, Joshua I., Steen, Eric J., Burd, Helcio, Evans, Sophia S., Redding-Johnson, Alyssa M., Batth, Tanveer, Benke, Peter I., D'haeseleer, Patrik, Sun, Ning, Sale, Kenneth L., Keasling, Jay D., Lee, Taek Soon, Petzold, Christopher J., Mukhopadhyay, Aindrila, Singer, Steven W., Simmons, Blake A., & Gladden, John M. A Thermophilic Ionic Liquid-Tolerant Cellulase Cocktail for the Production of Cellulosic Biofuels. United States. https://doi.org/10.1371/journal.pone.0037010
Park, Joshua I., Steen, Eric J., Burd, Helcio, Evans, Sophia S., Redding-Johnson, Alyssa M., Batth, Tanveer, Benke, Peter I., D'haeseleer, Patrik, Sun, Ning, Sale, Kenneth L., Keasling, Jay D., Lee, Taek Soon, Petzold, Christopher J., Mukhopadhyay, Aindrila, Singer, Steven W., Simmons, Blake A., and Gladden, John M. Wed .
"A Thermophilic Ionic Liquid-Tolerant Cellulase Cocktail for the Production of Cellulosic Biofuels". United States. https://doi.org/10.1371/journal.pone.0037010. https://www.osti.gov/servlets/purl/1511337.
@article{osti_1511337,
title = {A Thermophilic Ionic Liquid-Tolerant Cellulase Cocktail for the Production of Cellulosic Biofuels},
author = {Park, Joshua I. and Steen, Eric J. and Burd, Helcio and Evans, Sophia S. and Redding-Johnson, Alyssa M. and Batth, Tanveer and Benke, Peter I. and D'haeseleer, Patrik and Sun, Ning and Sale, Kenneth L. and Keasling, Jay D. and Lee, Taek Soon and Petzold, Christopher J. and Mukhopadhyay, Aindrila and Singer, Steven W. and Simmons, Blake A. and Gladden, John M.},
abstractNote = {Generation of biofuels from sugars in lignocellulosic biomass is a promising alternative to liquid fossil fuels, but efficient and inexpensive bioprocessing configurations must be developed to make this technology commercially viable. One of the major barriers to commercialization is the recalcitrance of plant cell wall polysaccharides to enzymatic hydrolysis. Biomass pretreatment with ionic liquids (ILs) enables efficient saccharification of biomass, but residual ILs inhibit both saccharification and microbial fuel production, requiring extensive washing after IL pretreatment. Pretreatment itself can also produce biomass-derived inhibitory compounds that reduce microbial fuel production. Therefore, there are multiple points in the process from biomass to biofuel production that must be interrogated and optimized to maximize fuel production. Here, we report the development of an IL-tolerant cellulase cocktail by combining thermophilic bacterial glycoside hydrolases produced by a mixed consortia with recombinant glycoside hydrolases. This enzymatic cocktail saccharifies IL-pretreated biomass at higher temperatures and in the presence of much higher IL concentrations than commercial fungal cocktails. Sugars obtained from saccharification of IL-pretreated switchgrass using this cocktail can be converted into biodiesel (fatty acid ethyl-esters or FAEEs) by a metabolically engineered strain of E. coli. During these studies, we found that this biodiesel-producing E. coli strain was sensitive to ILs and inhibitors released by saccharification. This cocktail will enable the development of novel biomass to biofuel bioprocessing configurations that may overcome some of the barriers to production of inexpensive cellulosic biofuels.},
doi = {10.1371/journal.pone.0037010},
journal = {PLoS ONE},
number = 5,
volume = 7,
place = {United States},
year = {Wed May 23 00:00:00 EDT 2012},
month = {Wed May 23 00:00:00 EDT 2012}
}
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Cited by: 140 works
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Figures / Tables:
Figure 1: A flow diagram of two potential biomass-to-biofuel bioprocessing configurations that utilize IL-pretreatment. A) Diagrams a configuration based on methods currently established in the literature and lists some potential barriers to commercialization (Problems). B) This configuration combines IL-pretreatment and saccharification into a single pot and may overcome barriers outlinedmore »
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- Amaike Campen, Saori; Lynn, Jed; Sibert, Stephanie J.
- PLOS ONE, Vol. 12, Issue 12
Exploring the Synergy between Cellobiose Dehydrogenase from Phanerochaete chrysosporium and Cellulase from Trichoderma reesei
journal, April 2016
- Wang, Min; Lu, Xuefeng
- Frontiers in Microbiology, Vol. 7
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