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Clostridium acetobutylicum ATCC 824 butyrate stress (29 mM)

ABSTRACT: Metabolite accumulation has pleiotropic, including toxic, effects on cellular physiology, but such effects are not well understood at the genomic level. Using DNA microarrays, the Clostridium acetobutylicum transcriptional stress response to butyrate was analyzed. Keywords: stress response

ORGANISM(S): Clostridium acetobutylicum Clostridium acetobutylicum ATCC 824

PROVIDER: GSE4992 | GEO | 2007/12/29

SECONDARY ACCESSION(S): PRJNA104503

REPOSITORIES: GEO

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Clostridium acetobutylicum ATCC 824 acetate stress (43 mM)

Project description:Metabolite accumulation has pleiotropic, including toxic, effects on cellular physiology, but such effects are not well understood at the genomic level. Using DNA microarrays, the Clostridium acetobutylicum transcriptional stress response to acetate was analyzed. Keywords: stress response

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Expression analysis of Clostridium acetobutylicum ATCC 824 grown on different carbohydrates

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Clostridium acetobutylicum ATCC 824 (pRDNA7) butyrate stress (0.6%)

Project description:An intergenic region found to be enriched from a genomic library under butyrate stress was overexpressed and challenged with butyrate (0.6%). The overexpression strain was compared to the plasmid control to determine the transcriptional changes due to overexpression and butyrate stress. RNA samples were taken from both the overexpression strain (pRDNA7) and the plasmid control strain (pSOS95del) at 0, 15, 40, 120, 240, and 360 min post a 0.6% butyrate (pH 6.7) stress. Two slides per timepoint were hybridized on a dye swap configuration.

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CcpA, a Pleiotropic Key Regulator in Butanol-producing Clostridium acetobutylicum ATCC 824

Project description:Clostridium acetobutylicum is a typical bacterium of major importance to industrial butanol production. In order to dissect the regulatory network pertaining to the industrial application of this bacterium, catabolite control protein A (CcpA) was investigated for its global function by DNA microarray.It showed that CcpA of C. acetobutylicum controls hundreds of genes, not only carbon metabolism, but also solvent production and sporulation in the life cycle.The results here demonstrated that CcpA is an important pleiotropic regulator related to some specific physiological and biochemical process in butanol-producing C. acetobutylicum.

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Metabolite stress response to butyric acid in Clostridium acetobutylicum ATCC 824

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Metabolite stress response to butanol in Clostridium acetobutylicum ATCC 824

Project description:Clostridium acetobutylicum is a Gram positive, endospore forming firmicute that has been known as the model organims for ABE (acetone-butanol-ethanol) fermentation. With its ability to consume a wide variety of substrates, C. acetobutylicum carries out a biphasic ABE fermentation, which consists of the acidogenic growth phase with the formation of butyric acid and acetic acid, followed by the solventogenic stationary phase with the formation of acetone, butanol and ethanol, characterised by the reassimilation of acids. The production butanol is of renewed ineterest both as a potential biofuel and bulk chemical production. Both butanol and butyrate posses toxic characteristic and here, we focus on understanding and modeling the stress response of C. acetobutylicum to one of the two important toxic metabolites: butanol. C. acetobutylicum cultures were grown, three biological replicates, to mid-exponential phase and then stressed with four levels of butanol (0 mM - No stress; 30 mM - Low stress; 60 mM - Medium stress; & 90 mM - High stress). Samples were collected following the stress at 0, 15, 30, 45, 60 and 75 min, post stress. These sampling times, which are of the order of the doubling time of these cells, were meant to capture largely the direct and immediate impact of these stresses on gene expression. The RNA extracted from two biological replicates were used for microarray hybridization foloowing cDNA generationa nd labelling using Agilent 44K arrays, while the third was used for q-RT-PCR validation. For each stress level, 6 time points with 2 biological replicates and dye swaps (Cy3/Cy5) were prepared for comparison. The hybridization was perfomed against an equal amount of oppositely labeled cDNA from common reference pool prepared using equal amounts of labeled cDNA from all four stress levels.

2013-08-20 | E-GEOD-48031 | biostudies-arrayexpress

Clostridium acetobutylicum ATCC 824 60-mer selection

Project description:Several custom made Agilent arrays were hybridized to select the best 60-mers for the transcriptional profiling of C. acetobutylicum strains. Keywords: Test of 60-mer performance

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