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Title: Metatranscriptomic analysis of lignocellulolytic microbial communities involved in high-solids decomposition of rice straw

Journal Article · · Biotechnology for Biofuels
 [1];  [1];  [2];  [2];  [3];  [3];  [4];  [5];  [2];  [1]
  1. Joint BioEnergy Institute, Emeryville, CA (United States); Univ. of California, Davis, CA (United States)
  2. Joint BioEnergy Institute, Emeryville, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Joint Genome Institute, Walnut Creek, CA (United States)
  4. Joint BioEnergy Institute, Emeryville, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  5. Joint BioEnergy Institute, Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

New lignocellulolytic enzymes are needed that maintain optimal activity under the harsh conditions present during industrial enzymatic deconstruction of biomass, including high temperatures, the absence of free water, and the presence of inhibitors from the biomass. Enriching lignocellulolytic microbial communities under these conditions provides a source of microorganisms that may yield robust lignocellulolytic enzymes tolerant to the extreme conditions needed to improve the throughput and efficiency of biomass enzymatic deconstruction. Identification of promising enzymes from these systems is challenging due to complex substrate-enzyme interactions and requirements to assay for activity. In this study, metatranscriptomes from compost-derived microbial communities enriched on rice straw under thermophilic and mesophilic conditions were sequenced and analyzed to identify lignocellulolytic enzymes overexpressed under thermophilic conditions. To determine differential gene expression across mesophilic and thermophilic treatments, a method was developed which pooled gene expression by functional category, as indicated by Pfam annotations, since microbial communities performing similar tasks are likely to have overlapping functions even if they share no specific genes. Differential expression analysis identified enzymes from glycoside hydrolase family 48, carbohydrate binding module family 2, and carbohydrate binding module family 33 domains as significantly overexpressed in the thermophilic community. Overexpression of these protein families in the thermophilic community resulted from expression of a small number of genes not currently represented in any protein database. Genes in overexpressed protein families were predominantly expressed by a single Actinobacteria genus, Micromonospora. In conclusion, coupling measurements of deconstructive activity with comparative analyses to identify overexpressed enzymes in lignocellulolytic communities provides a targeted approach for discovery of candidate enzymes for more efficient biomass deconstruction. Furthermore, glycoside hydrolase family 48 cellulases and carbohydrate binding module family 33 polysaccharide monooxygenases with carbohydrate binding module family 2 domains may improve saccharification of lignocellulosic biomass under high-temperature and low moisture conditions relevant to industrial biofuel production.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Joint BioEnergy Institute (JBEI), Emeryville, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); UC Office of the President; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC02-05CH11231; 237496; AC52-07NA27344
OSTI ID:
1257270
Alternate ID(s):
OSTI ID: 1860859
Report Number(s):
LLNL-JRNL-831202; PII: 180
Journal Information:
Biotechnology for Biofuels, Vol. 7, Issue 1; ISSN 1754-6834
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Microbial community structure and dynamics in thermophilic composting viewed through metagenomics and metatranscriptomics journal December 2016
The initial soil microbiota impacts the potential for lignocellulose degradation during soil solarization journal January 2019
Nutrient availability shapes the microbial community structure in sugarcane bagasse compost-derived consortia journal December 2016
Targeted metatranscriptomics of compost-derived consortia reveals a GH11 exerting an unusual exo-1,4-β-xylanase activity journal November 2017
Structural Basis of Stereospecificity in the Bacterial Enzymatic Cleavage of β-Aryl Ether Bonds in Lignin journal December 2015
Genome-Centric Analysis of a Thermophilic and Cellulolytic Bacterial Consortium Derived from Composting journal April 2017
The structural and functional contributions of β-glucosidase-producing microbial communities to cellulose degradation in composting journal February 2018
The distribution of active β-glucosidase-producing microbial communities in composting journal December 2017
Metasecretome analysis of a lignocellulolytic microbial consortium grown on wheat straw, xylan and xylose journal December 2015
Characterization of three plant biomass-degrading microbial consortia by metagenomics- and metasecretomics-based approaches journal July 2016
Metagenomic mining pectinolytic microbes and enzymes from an apple pomace-adapted compost microbial community journal August 2017
Discovery and characterization of a thermostable two-domain GH6 endoglucanase from a compost metagenome journal May 2018
Temporal Expression Dynamics of Plant Biomass-Degrading Enzymes by a Synthetic Bacterial Consortium Growing on Sugarcane Bagasse journal February 2018