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Title: A functional metagenomic approach for expanding the synthetic biology toolbox for biomass conversion

Journal Article · · Molecular Systems Biology
 [1];  [2];  [3]
  1. Harvard Medical School, Boston, MA (United States). Dept. of Genetics; DOE/OSTI
  2. Harvard Medical School, Boston, MA (United States). Dept. of Genetics
  3. Washington Univ., St. Louis, MO (United States). School of Medicine, Center for Genome Sciences and Systems Biology, Dept. of Pathology and Immunology

Sustainable biofuel alternatives to fossil fuel energy are hampered by recalcitrance and toxicity of biomass substrates to microbial biocatalysts. To address this issue, we present a cultureindependent functional metagenomic platform for mining Nature’s vast enzymatic reservoir and show its relevance to biomass conversion. We performed functional selections on 4.7 Gb of metagenomic fosmid libraries and show that genetic elements conferring tolerance toward seven important biomass inhibitors can be identified. We select two metagenomic fosmids that improve the growth of Escherichia coli by 5.7- and 6.9-fold in the presence of inhibitory concentrations of syringaldehyde and 2-furoic acid, respectively, and identify the individual genes responsible for these tolerance phenotypes. Finally, we combine the individual genes to create a three-gene construct that confers tolerance to mixtures of these important biomass inhibitors. This platform presents a route for expanding the repertoire of genetic elements available to synthetic biology and provides a starting point for efforts to engineer robust strains for biofuel generation.

Research Organization:
Harvard Medical School, Boston, MA (United States)
Sponsoring Organization:
Det Kongelige Danske Videnskabernes Selskab; The Hartmann Foundation; USDOE
OSTI ID:
1623797
Journal Information:
Molecular Systems Biology, Journal Name: Molecular Systems Biology Journal Issue: 1 Vol. 6; ISSN 1744-4292
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Long-Chain N -Acyl Amino Acid Antibiotics Isolated from Heterologously Expressed Environmental DNA journal December 2000
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The metagenomics of soil journal June 2005
Engineering Life: Building a FAB for Biology journal June 2006
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Uncultured soil bacteria are a reservoir of new antibiotic resistance genes journal September 2004
Ethanol Can Contribute to Energy and Environmental Goals journal January 2006
Carbon-Negative Biofuels from Low-Input High-Diversity Grassland Biomass journal December 2006
Biomass Recalcitrance: Engineering Plants and Enzymes for Biofuels Production journal February 2007
Use of U.S. Croplands for Biofuels Increases Greenhouse Gases Through Emissions from Land-Use Change journal February 2008
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Synthetic biology approaches to improve biocatalyst identification in metagenomic library screening journal August 2014
Chapter 12: Human Microbiome Analysis journal December 2012
Evaluation of a Pooled Strategy for High-Throughput Sequencing of Cosmid Clones from Metagenomic Libraries journal June 2014
Novel resistance functions uncovered using functional metagenomic investigations of resistance reservoirs journal January 2013
Current and future resources for functional metagenomics journal October 2015
Reference-free resolving of long-read metagenomic data collection January 2018
A load driver device for engineering modularity in biological networks journal November 2014
Predictable tuning of protein expression in bacteria journal January 2016
Synthetic and systems biology for microbial production of commodity chemicals journal April 2016
Diverse genetic error modes constrain large-scale bio-based production journal February 2018
The evolving interface between synthetic biology and functional metagenomics journal July 2018
Thermochemical wastewater valorization via enhanced microbial toxicity tolerance journal January 2018
Novel acid resistance genes from the metagenome of the Tinto River, an extremely acidic environment: Novel acid-resistance genes in bacteria journal November 2012
Exploring the diversity of arsenic resistance genes from acid mine drainage microorganisms: Arsenic-resistance genes in bacteria journal June 2014
Combinatorial Strategies for Improving Multiple-Stress Resistance in Industrially Relevant Escherichia coli Strains journal August 2014
Chapter 12: Human Microbiome Analysis journal December 2012
Current and future resources for functional metagenomics journal October 2015