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Title: Genus-wide assessment of lignocellulose utilization in the extremely thermophilic Caldicellulosiruptor by genomic, pan-genomic and metagenomic analysis

Journal Article · · Applied and Environmental Microbiology
DOI:https://doi.org/10.1128/AEM.02694-17· OSTI ID:1432145
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [3];  [2];  [2];  [4];  [2];  [5];  [1]
  1. North Carolina State Univ., Raleigh, NC (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States)
  5. Univ. of Georgia, Athens, GA (United States)

Metagenomic data from Obsidian Pool (Yellowstone National Park, USA) and thirteen genome sequences were used to re-assess genus-wide biodiversity for the extremely thermophilicCaldicellulosiruptor. The updated core-genome contains 1,401 ortholog groups (average genome size for thirteen species = 2,516 genes). The pan-genome, which remains open with a revised total of 3,493 ortholog groups, encodes a variety of multi-domain glycoside hydrolases (GH). These include three cellulases with GH48 domains that are co-located in the Glucan Degradation Locus (GDL) and are specific determinants for microcrystalline cellulose utilization. Three recently sequenced species,Caldicellulosiruptorsp. str. Rt8.B8 (re-named hereCaldicellulosiruptor morganii),Thermoanaerobacter cellulolyticusstr. NA10 (re-named hereCaldicellulosiruptor naganoensisNA10), andCaldicellulosiruptorsp. str. Wai35.B1 (re-named hereCaldicellulosiruptor danielii) degraded Avicel and lignocellulose (switchgrass).C. morganiiwas more efficient thanC. besciiin this regard and differed from the other twelve species examined here, both based on genome content and organization and in the specific domain features of conserved GHs. Metagenomic analysis of lignocellulose-enriched samples from Obsidian Pool revealed limited new information on genus biodiversity. Enrichments yielded genomic signatures closely related toCaldicellulosiruptor obsidiansis, but there was also evidence for other thermophilic fermentative anaerobes (Caldanaerobacter,Fervidobacterium,Caloramator, andClostridium). One enrichment, containing 89.7%Caldicellulosiruptorand 9.7%Caloramator, had a capacity for switchgrass solubilization comparable toC. bescii. These results refine the known biodiversity ofCaldicellulosiruptorand indicate that microcrystalline cellulose degradation at temperatures above 70°C, based on current information, is limited to certain members of this genus that produce GH48 domain-containing enzymes. The genusCaldicellulosiruptorcontains the most thermophilic bacteria capable of lignocellulose deconstruction and are promising candidates for consolidated bioprocessing for the production of biofuels and bio-based chemicals. The focus here is on the extant capability of this genus for plant biomass degradation and the extent to which this can be inferred from the core and pan-genomes, based on analysis of thirteen species and metagenomic sequence information from environmental samples. Key to microcrystalline hydrolysis is the content of the Glucan Degradation Locus (GDL), a set of genes encoding glycoside hydrolases (GH), several of which have GH48 and family 3 carbohydrate binding module domains, that function as primary cellulases. Resolving the relationship between the GDL and lignocellulose degradation will inform efforts to identify more prolific members of the genus and to develop metabolic engineering strategies to improve this characteristic

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1432145
Journal Information:
Applied and Environmental Microbiology, Vol. 84, Issue n/a; ISSN 0099-2240
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (9)

The GH10 and GH48 dual-functional catalytic domains from a multimodular glycoside hydrolase synergize in hydrolyzing both cellulose and xylan journal December 2019
Quantitative fermentation of unpretreated transgenic poplar by Caldicellulosiruptor bescii journal August 2019
Lignocellulose solubilization and conversion by extremely thermophilic Caldicellulosiruptor bescii improves by maintaining metabolic activity journal May 2019
Distinct nitrogen cycling and steep chemical gradients in Trichodesmium colonies journal October 2019
Novel multidomain, multifunctional glycoside hydrolases from highly lignocellulolytic Caldicellulosiruptor species journal August 2018
Complete Genome Sequence of Caldicellulosiruptor changbaiensis CBS-Z, an Extremely Thermophilic, Cellulolytic Bacterium Isolated from a Hot Spring in China journal February 2019
The thermophilic biomass-degrading bacterium Caldicellulosiruptor bescii utilizes two enzymes to oxidize glyceraldehyde 3-phosphate during glycolysis journal May 2019
Genomic and physiological analyses reveal that extremely thermophilic Caldicellulosiruptor changbaiensis deploys uncommon cellulose attachment mechanisms journal August 2019
Multidisciplinary involvement and potential of thermophiles journal November 2018