Directed combinatorial mutagenesis of Escherichia coli for complex phenotype engineering
Abstract
Strain engineering for industrial production requires a targeted improvement of multiple complex traits, which range from pathway flux to tolerance to mixed sugar utilization. Here, we report the use of an iterative CRISPR EnAbled Trackable genome Engineering (iCREATE) method to engineer rapid glucose and xylose co-consumption and tolerance to hydrolysate inhibitors in E. coli. Deep mutagenesis libraries were rationally designed, constructed, and screened to target ~40,000 mutations across 30 genes. These libraries included global and high-level regulators that regulate global gene expression, transcription factors that play important roles in genome-level transcription, enzymes that function in the sugar transport system, NAD(P)H metabolism, and the aldehyde reduction system. Specific mutants that conferred increased growth in mixed sugars and hydrolysate tolerance conditions were isolated, confirmed, and evaluated for changes in genome-wide expression levels. As a result, we tested the strain with positive combinatorial mutations for 3-hydroxypropionic acid (3HP) production under high furfural and high acetate hydrolysate fermentation, which demonstrated a 7- and 8-fold increase in 3HP productivity relative to the parent strain, respectively.
- Authors:
-
- Univ. of Colorado, Boulder, CO (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Bioenergy Technologies Office
- OSTI Identifier:
- 1432610
- Alternate Identifier(s):
- OSTI ID: 1632227
- Report Number(s):
- NREL/JA-5100-71281
Journal ID: ISSN 1096-7176; MainId:16871;UUID:66cfdc6a-5538-e811-9c15-2c44fd93e385;MainAdminID:5349
- Grant/Contract Number:
- AC36-08GO28308; FOA-0000996
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Metabolic Engineering
- Additional Journal Information:
- Journal Volume: 47; Journal Issue: C; Journal ID: ISSN 1096-7176
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 09 BIOMASS FUELS; Iterative CRISPR EnAbled Trackable genome; engineering; genome engineering; combinatorial mutagenesis; lignocellulosic biomass
Citation Formats
Liu, Rongming, Liang, Liya, Garst, Andrew D., Choudhury, Alaksh, Nogue, Violeta Sanchez i., Beckham, Gregg T., and Gill, Ryan T. Directed combinatorial mutagenesis of Escherichia coli for complex phenotype engineering. United States: N. p., 2018.
Web. doi:10.1016/j.ymben.2018.02.007.
Liu, Rongming, Liang, Liya, Garst, Andrew D., Choudhury, Alaksh, Nogue, Violeta Sanchez i., Beckham, Gregg T., & Gill, Ryan T. Directed combinatorial mutagenesis of Escherichia coli for complex phenotype engineering. United States. https://doi.org/10.1016/j.ymben.2018.02.007
Liu, Rongming, Liang, Liya, Garst, Andrew D., Choudhury, Alaksh, Nogue, Violeta Sanchez i., Beckham, Gregg T., and Gill, Ryan T. Thu .
"Directed combinatorial mutagenesis of Escherichia coli for complex phenotype engineering". United States. https://doi.org/10.1016/j.ymben.2018.02.007. https://www.osti.gov/servlets/purl/1432610.
@article{osti_1432610,
title = {Directed combinatorial mutagenesis of Escherichia coli for complex phenotype engineering},
author = {Liu, Rongming and Liang, Liya and Garst, Andrew D. and Choudhury, Alaksh and Nogue, Violeta Sanchez i. and Beckham, Gregg T. and Gill, Ryan T.},
abstractNote = {Strain engineering for industrial production requires a targeted improvement of multiple complex traits, which range from pathway flux to tolerance to mixed sugar utilization. Here, we report the use of an iterative CRISPR EnAbled Trackable genome Engineering (iCREATE) method to engineer rapid glucose and xylose co-consumption and tolerance to hydrolysate inhibitors in E. coli. Deep mutagenesis libraries were rationally designed, constructed, and screened to target ~40,000 mutations across 30 genes. These libraries included global and high-level regulators that regulate global gene expression, transcription factors that play important roles in genome-level transcription, enzymes that function in the sugar transport system, NAD(P)H metabolism, and the aldehyde reduction system. Specific mutants that conferred increased growth in mixed sugars and hydrolysate tolerance conditions were isolated, confirmed, and evaluated for changes in genome-wide expression levels. As a result, we tested the strain with positive combinatorial mutations for 3-hydroxypropionic acid (3HP) production under high furfural and high acetate hydrolysate fermentation, which demonstrated a 7- and 8-fold increase in 3HP productivity relative to the parent strain, respectively.},
doi = {10.1016/j.ymben.2018.02.007},
journal = {Metabolic Engineering},
number = C,
volume = 47,
place = {United States},
year = {Thu Mar 29 00:00:00 EDT 2018},
month = {Thu Mar 29 00:00:00 EDT 2018}
}
Web of Science
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