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Title: Development of an E. coli strain for one-pot biofuel production from ionic liquid pretreated cellulose and switchgrass

Abstract

Biological production of chemicals and fuels using microbial transformation of sustainable carbon sources, such as pretreated and saccharified plant biomass, is a multi-step process. Typically, each segment of the workflow is optimized separately, often generating conditions that may not be suitable for integration or consolidation with the upstream or downstream steps. While significant effort has gone into developing solutions to incompatibilities at discrete steps, very few studies report the consolidation of the multi-step workflow into a single pot reactor system. Here we demonstrate a one-pot biofuel production process that uses the ionic liquid 1-ethyl-3-methylimidazolium acetate (C 2C 1Im][OAc] ) for pretreatment of switchgrass biomass. [C 2C 1Im][OAc] is highly effective in deconstructing lignocellulose, but nonetheless leaves behind residual reagents that are toxic to standard saccharification enzymes and the microbial production host. We report the discovery of an [C 2C 1Im]-tolerant E. coli strain, where [C 2C 1Im] tolerance is bestowed by a P7Q mutation in the transcriptional regulator encoded by rcdA. We establish that the causal impact of this mutation is the derepression of a hitherto uncharacterized major facilitator family transporter, YbjJ. To develop the strain for a one-pot process we engineered this [C 2C 1Im]-tolerant strain to express amore » recently reported d-limonene production pathway. We also screened previously reported [C 2C 1Im]-tolerant cellulases to select one that would function with the range of E. coli cultivation conditions and expressed it in the [C 2C 1 Im]-tolerant E. coli strain so as to secrete this [C 2C 1Im]-tolerant cellulase. The final strain digests pretreated biomass, and uses the liberated sugars to produce the bio-jet fuel candidate precursor d-limonene in a one-pot process.« less

Authors:
 [1];  [2];  [1];  [3];  [3];  [4];  [4];  [5];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States)
  2. Total New Energies Inc., Emeryville, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Advanced Biofuels Process Demonstration Unit, Emeryville, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1378746
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Green Chemistry
Additional Journal Information:
Journal Volume: 18; Journal Issue: 15; Journal ID: ISSN 1463-9262
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; E. Coli; biofuels

Citation Formats

Frederix, Marijke, Mingardon, Florence, Hu, Matthew, Sun, Ning, Pray, Todd, Singh, Seema, Simmons, Blake A., Keasling, Jay D., and Mukhopadhyay, Aindrila. Development of an E. coli strain for one-pot biofuel production from ionic liquid pretreated cellulose and switchgrass. United States: N. p., 2016. Web. doi:10.1039/c6gc00642f.
Frederix, Marijke, Mingardon, Florence, Hu, Matthew, Sun, Ning, Pray, Todd, Singh, Seema, Simmons, Blake A., Keasling, Jay D., & Mukhopadhyay, Aindrila. Development of an E. coli strain for one-pot biofuel production from ionic liquid pretreated cellulose and switchgrass. United States. doi:10.1039/c6gc00642f.
Frederix, Marijke, Mingardon, Florence, Hu, Matthew, Sun, Ning, Pray, Todd, Singh, Seema, Simmons, Blake A., Keasling, Jay D., and Mukhopadhyay, Aindrila. Mon . "Development of an E. coli strain for one-pot biofuel production from ionic liquid pretreated cellulose and switchgrass". United States. doi:10.1039/c6gc00642f. https://www.osti.gov/servlets/purl/1378746.
@article{osti_1378746,
title = {Development of an E. coli strain for one-pot biofuel production from ionic liquid pretreated cellulose and switchgrass},
author = {Frederix, Marijke and Mingardon, Florence and Hu, Matthew and Sun, Ning and Pray, Todd and Singh, Seema and Simmons, Blake A. and Keasling, Jay D. and Mukhopadhyay, Aindrila},
abstractNote = {Biological production of chemicals and fuels using microbial transformation of sustainable carbon sources, such as pretreated and saccharified plant biomass, is a multi-step process. Typically, each segment of the workflow is optimized separately, often generating conditions that may not be suitable for integration or consolidation with the upstream or downstream steps. While significant effort has gone into developing solutions to incompatibilities at discrete steps, very few studies report the consolidation of the multi-step workflow into a single pot reactor system. Here we demonstrate a one-pot biofuel production process that uses the ionic liquid 1-ethyl-3-methylimidazolium acetate (C2C1Im][OAc] ) for pretreatment of switchgrass biomass. [C2C1Im][OAc] is highly effective in deconstructing lignocellulose, but nonetheless leaves behind residual reagents that are toxic to standard saccharification enzymes and the microbial production host. We report the discovery of an [C2C1Im]-tolerant E. coli strain, where [C2C1Im] tolerance is bestowed by a P7Q mutation in the transcriptional regulator encoded by rcdA. We establish that the causal impact of this mutation is the derepression of a hitherto uncharacterized major facilitator family transporter, YbjJ. To develop the strain for a one-pot process we engineered this [C2C1Im]-tolerant strain to express a recently reported d-limonene production pathway. We also screened previously reported [C2C1Im]-tolerant cellulases to select one that would function with the range of E. coli cultivation conditions and expressed it in the [C2C1 Im]-tolerant E. coli strain so as to secrete this [C2C1Im]-tolerant cellulase. The final strain digests pretreated biomass, and uses the liberated sugars to produce the bio-jet fuel candidate precursor d-limonene in a one-pot process.},
doi = {10.1039/c6gc00642f},
journal = {Green Chemistry},
issn = {1463-9262},
number = 15,
volume = 18,
place = {United States},
year = {2016},
month = {4}
}

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Cited by: 22 works
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