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RNA expression for ethanologenic E coli strains LY180, EMFR9 and EMFR35 in the absence and presence of 5mM and 15 mM furfural for 15 min

ABSTRACT: The data explore the transcriptional response of strains LY180 and EMFR9 to 5 mM furfural under anaerobic fermentation condition The data explore the transcriptional response of strains LY180 and EMFR35 to 15 mM furfural under anaerobic fermentation condition The expression differences of polyamine transporters in LY180 vs EMFR9 and EMFR35 are further described in RD Geddes,X Wang, LP Yomano, EN Miller, H Zheng, KT Shanmugam, and LO Ingram. 2013. Selected Polyamines and Polyamine Transporters Increase Furfural Tolerance (in preparation for submission to Appl Env Microbiol)

ORGANISM(S): Escherichia coli str. K-12 substr. MG1655 Escherichia coli W

PROVIDER: GSE46442 | GEO | 2013/04/29

SECONDARY ACCESSION(S): PRJNA200544

REPOSITORIES: GEO

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Project description:Furfural is the prevalent microbial inhibitor generated during pretreatment and hydrolysis of lignocellulosic biomass to monomeric sugars, but the molecular response of Clostridium beijerinckii NCIMB 8052 to this compound is unknown. To discern the effect of furfural on C. beijerinckii and to gain insights into the molecular mechanisms of action and detoxification, we studied the physiological changes of furfural-stressed cultures during acetone-butanol-ethanol (ABE) fermentation, and profiled differentially expressed genes by genome-wide transcriptional analysis. C. beijerinckii exposed to furfural stress during the acidogenic growth phase produced 13% more ABE than the unstressed control. The growth and ABE by C. beijerinckii ceased following exposure to furfural stress during the solventogenic growth phase. By comparing gene expression of furfural-stressed cultures to that of the unstressed control, at both the acidogenic and solventogenic phases, we ascertained that furfural induces expression of several genes including those that code for heat shock proteins, redox enzymes and cofactor associated proteins, and ATP-binding cassette transporters, and represses genes belonging to the phosphotransferase system, two-component system, chemotaxis and cell motility. Based on these results, we discuss the underpinning for furfural-mediated change in ABE fermentation by the solventogenic Clostridium species. C. beijerinckii 8052 pre-culture was incubated anaerobically to attain acidogenic or solventogenic growth phase. The culture was then subdivided into two bottles. One bottle was challenged with furfural and the other bottle was left unchallenged. After 3 h growth, C. beijerinckii 8052 samples were collected, during which the original concentration of furfural in the growth medium was reduced to more than half. Total RNA was isolated, purified, converted to enriched mRNA, and dye-coupled (Alexa Fluor 555) complementary cRNA. This was followed by hybridization and microarray data analysis.

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RNA expression for ethanologenic E coli strains LY180, EMFR9 and EMFR35 in the absence and presence of 5mM and 15 mM furfural for 15 min

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