Transcriptomic analysis of a Clostridium thermocellum strain engineered to utilize xylose: responses to xylose versus cellobiose feeding
Autor: | Luis H. Reyes, Trevor Croft, Albert Enrique Tafur Rangel, Katherine J. Chou, Pin-Ching Maness, Andrés Fernando González Barrios |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
0301 basic medicine
Cellobiose Molecular biology lcsh:Medicine Xylose Transketolase Microbiology Article Clostridium thermocellum 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Clostridium Xylose metabolism Bacterial Proteins Polysaccharides Hemicellulose Cellulose lcsh:Science Multidisciplinary biology lcsh:R Gene Expression Regulation Bacterial biology.organism_classification Computational biology and bioinformatics 030104 developmental biology chemistry Biochemistry lcsh:Q Systems biology Transcriptome 030217 neurology & neurosurgery Bacteria Biotechnology |
Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-15 (2020) Scientific Reports |
ISSN: | 2045-2322 |
DOI: | 10.1038/s41598-020-71428-6 |
Popis: | Clostridium (Ruminiclostridium) thermocellum is recognized for its ability to ferment cellulosic biomass directly, but it cannot naturally grow on xylose. Recently, C. thermocellum (KJC335) was engineered to utilize xylose through expressing a heterologous xylose catabolizing pathway. Here, we compared KJC335′s transcriptomic responses to xylose versus cellobiose as the primary carbon source and assessed how the bacteria adapted to utilize xylose. Our analyses revealed 417 differentially expressed genes (DEGs) with log2 fold change (FC) >|1| and 106 highly DEGs (log2 FC >|2|). Among the DEGs, two putative sugar transporters, cbpC and cbpD, were up-regulated, suggesting their contribution to xylose transport and assimilation. Moreover, the up-regulation of specific transketolase genes (tktAB) suggests the importance of this enzyme for xylose metabolism. Results also showed remarkable up-regulation of chemotaxis and motility associated genes responding to xylose feeding, as well as widely varying gene expression in those encoding cellulosomal enzymes. For the down-regulated genes, several were categorized in gene ontology terms oxidation–reduction processes, ATP binding and ATPase activity, and integral components of the membrane. This study informs potentially critical, enabling mechanisms to realize the conceptually attractive Next-Generation Consolidated BioProcessing approach where a single species is sufficient for the co-fermentation of cellulose and hemicellulose. |
Databáze: | OpenAIRE |
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