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A High Throughput Screen for Biomining Cellulase Activity from Metagenomic Libraries
Published on: February 1, 2011
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Multi-omic Directed Discovery of Cellulosomes, Polysaccharide Utilization Loci, and Lignocellulases from an Enriched
Geizecler Tomazetto1,2, Agnes C Pimentel3, Daniel Wibberg4
1Programa de Processos Tecnológicos e Ambientais, Universidade de Sorocaba, Sorocaba, Brazil.
Applied and Environmental Microbiology
|July 19, 2020
Summary
Researchers developed an enriched rumen anaerobic consortium (ERAC) to efficiently break down lignocellulose. This microbial community possesses a diverse array of enzymes, offering a promising strategy for sustainable biofuel and chemical production.
Area of Science:
- Microbiology and Biotechnology
- Biorefining and Renewable Energy
Background:
- Lignocellulose is an abundant renewable resource, but its efficient breakdown for fuel and chemical production is economically challenging.
- Enzyme mixtures from single strains often lack the necessary synergistic carbohydrate-active enzymes (CAZymes) for effective lignocellulose saccharification.
- Microbial enrichment strategies can create consortia with enhanced CAZyme capabilities for improved lignocellulose deconstruction.
Purpose of the Study:
- To analyze an enriched rumen anaerobic consortium (ERAC) developed on sugarcane bagasse (SB) for its lignocellulolytic potential.
- To characterize the microbial community composition and genetic makeup responsible for efficient lignocellulose degradation.
- To identify novel enzymes and enzymatic complexes for potential applications in biorefineries.
Main Methods:
- Enrichment of a rumen anaerobic consortium on sugarcane bagasse.
- Analysis of lignocellulose depolymerization using scanning electron microscopy, enzymatic assays, and mass spectrometry.
- Taxonomic analysis via 16S rRNA sequencing and shotgun metagenomic sequencing to identify microbial composition and functional genes.
Main Results:
- The ERAC demonstrated significant lignocellulolytic activity, effectively deconstructing sugarcane bagasse.
- Taxonomic analysis revealed a dominance of *Firmicutes* and *Synergistetes* species in the enriched consortium.
- Metagenomic analysis identified 41 metagenome-assembled genomes (MAGs) with diverse CAZymes, cellulosomes, and polysaccharide utilization loci (PULs).
- A novel clostridial MAG was identified, producing cellulosomal proteins with scaffoldin and dockerin modules.
Conclusions:
- The ERAC possesses a unique and diverse enzymatic arsenal for plant polysaccharide degradation.
- The identified MAGs expand the known genomic resources for lignocellulose breakdown in rumen bacteria.
- This study provides a valuable resource for developing biocatalytic strategies for lignocellulose-based biorefineries.
