Effect of ethanol supplementation on the transcriptional landscape of bionanocellulose producer Komagataeibacter xylinus E25.
Małgorzata RyngajłłoPaulina JacekIzabela CieleckaHalina KalinowskaStanisław BieleckiPublished in: Applied microbiology and biotechnology (2019)
Ethanol exerts a strong positive effect on the cellulose yields from the widely exploited microbial producers of the Komagataeibacter genus. Ethanol is postulated to provide an alternative energy source, enabling effective use of glucose for cellulose biosynthesis rather than for energy acquisition. In this paper, we investigate the effect of ethanol supplementation on the global gene expression profile of Komagataeibacter xylinus E25 using RNA sequencing technology (RNA-seq). We demonstrate that when ethanol is present in the culture medium, glucose metabolism is directed towards cellulose production due to the induction of genes related to UDP-glucose formation and the repression of genes involved in glycolysis and acetan biosynthesis. Transcriptional changes in the pathways of cellulose biosynthesis and c-di-GMP metabolism are also described. The transcript level profiles suggest that Schramm-Hestrin medium supplemented with ethanol promotes bacterial growth by inducing protein biosynthesis and iron uptake. We observed downregulation of genes encoding transposases of the IS110 family which may provide one line of evidence explaining the positive effect of ethanol supplementation on the genotypic stability of K. xylinus E25. The results of this study increase knowledge and understanding of the regulatory effects imposed by ethanol on cellulose biosynthesis, providing new opportunities for directed strain improvement, scaled-up bionanocellulose production, and wider industrial exploitation of the Komagataeibacter species as bacterial cellulose producers.
Keyphrases
- rna seq
- ionic liquid
- single cell
- gene expression
- genome wide
- cell wall
- transcription factor
- healthcare
- aqueous solution
- silver nanoparticles
- metabolic syndrome
- adipose tissue
- type diabetes
- heavy metals
- signaling pathway
- cell proliferation
- microbial community
- staphylococcus aureus
- dna methylation
- skeletal muscle
- escherichia coli
- blood glucose
- weight loss
- small molecule
- amino acid
- heat stress
- heat shock
- binding protein
- protein protein