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Title: Specialized activities and expression differences for Clostridium thermocellum biofilm and planktonic cells

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep43583· OSTI ID:1361314
 [1];  [1];  [1];  [1];  [2];  [2];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC) and Biosciences Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC) and Chemical Sciences Division

Clostridium thermocellum forms biofilms adherent to lignocellulosic feedstock in a typical continuous cell-monolayer to efficiently break down and uptake cellulose hydrolysates. The sessile cells of biofilms may revert to non-adherent planktonic cells through generation of offspring cells or microenvironment constraints such as limited surface area. These interdependent cell populations co-exist and have different contributions to culture activity and growth. Here, we developed a novel bioreactor design to rapidly harvest sessile and planktonic cell populations for omics studies. In RNA-seq analyses, within 3299 protein coding genes, 59% (or 1958 genes) were differentially expressed with a minimum two-fold change between the two cell populations isolated simultaneously at high culture activity. Furthermore, sessile cells had definitive greater expression of genes involved in catabolism of carbohydrates by glycolysis and pyruvate fermentation, ATP generation by proton gradient, the anabolism of proteins and lipids and cellular functions critical for cell division; planktonic cells had notably higher gene expression for flagellar motility and chemotaxis, cellulosomal cellulases and anchoring scaffoldins, and a range of stress induced homeostasis mechanisms such as oxidative stress protection by antioxidants and flavoprotein co-factors, methionine repair, Fe-S cluster assembly and repair in redox proteins, cell growth control through tRNA thiolation, recovery of damaged DNA by nucleotide excision repair and removal of terminal proteins by proteases. Our knowledge of these cellular adaptations will aid the engineering of industrially relevant strains for consolidated bioprocessing of solid lignocellulosic biomass

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1361314
Journal Information:
Scientific Reports, Vol. 7; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (4)

Cellulosomes localise on the surface of membrane vesicles from the cellulolytic bacterium Clostridium thermocellum journal June 2019
Clostridium thermocellum LL1210 pH homeostasis mechanisms informed by transcriptomics and metabolomics journal April 2018
A global analysis of gene expression in Fibrobacter succinogenes S85 grown on cellulose and soluble sugars at different growth rates journal October 2018
Anaerobic microplate assay for direct microbial conversion of switchgrass and Avicel using Clostridium thermocellum journal November 2017

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