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Expression profile of E. coli in response to exogenous addition of isopentenol

ABSTRACT: Exogenous isopentenol was added to a culture of E. coli and the RNA expression response was measured using Nimblegen arrays. Genes highly upregulated were then subsequently overexpressed to improve the tolerance to isopentenol toxicity. In addition a subset of genes that improved the tolerance were also overexpressed in a producing strain, leading to improved production over the empty vector control. This work is described in Foo et al, Improving microbial bio-gasoline production in E. coli using tolerance engineering (in preparation)

ORGANISM(S): Escherichia coli Escherichia coli K-12

PROVIDER: GSE53138 | GEO | 2013/12/10

SECONDARY ACCESSION(S): PRJNA230972

REPOSITORIES: GEO

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Expression profile of E. coli in response to exogenous addition of isopentenol

Project description:Exogenous isopentenol was added to a culture of E. coli and the RNA expression response was measured using Nimblegen arrays. Genes highly upregulated were then subsequently overexpressed to improve the tolerance to isopentenol toxicity. In addition a subset of genes that improved the tolerance were also overexpressed in a producing strain, leading to improved production over the empty vector control. This work is described in Foo et al, Improving microbial bio-gasoline production in E. coli using tolerance engineering (in preparation) Six independent biological replicates were grown in M9 medium. 0.2% v/v isopentenol was added to 3 cultures while 3 cultures received no treatment, and 2.5 hr later total RNA was extracted. One sample from each culture was hybridized.

2013-12-10 | E-GEOD-53138 | biostudies-arrayexpress

Functional Genomic Study of Exogenous n-Butanol Stress in Escherichia coli

Project description:n-Butanol has been proposed as an alternative biofuel to ethanol, and both Escherichia coli and Saccharomyces cerevisiae have been engineered to produce it. Unfortunately, n-butanol is more toxic than ethanol to these organisms. To understand the basis for its toxicity, cell wide studies were conducted at the transcript, protein and metabolite levels to obtain a global view of the n-butanol stress response. Analysis of the data indicate that n-butanol stress has components common to other stress responses and includes perturbation in respiratory functions (nuo, cyo operons), oxidative stress (sodC, katG, yqhD), heat shock and cell envelope stress (rpoE, clpB, htpG, degP, cpxPR), metabolite transport (malE, opp operon) and biosynthesis. Inducible expression of the yqhD gene was found to improve the hostâs tolerance to exogenous n-butanol and confirms the role of this gene in coping with butanol stress. To survey for other potential candidates that may serve to improve host tolerance, mutant strains in several candidates which show changes at the transcript and protein levels were examined for sensitivity during butanol exposure. Chassis engineering based on these cues may be required in a high production titer, butanol-producing host. This comparison is between E. coli DH1 cells treated with 0.8% n-butanol and untreated cells at 0, 30, 80, and 195 minutes after addition. 3 biological replicates were grown, total RNA was extracted, labeled, and hybridized on 3 slides for each time point. http://www.microbesonline.org/cgi-bin/microarray/viewExp.cgi?expId=1266

2010-05-16 | E-GEOD-16973 | biostudies-arrayexpress

Corynebacterium glutamicum as a powerful host for the production of 5-aminovalerate from glucose fermentation

Project description:5-aminovalerate (5AVA), L-lysine derived compound, represents a potential building block for the production of the bio-plastic nylon-5. Escherichia coli has been engineered for the production of 5AVA, but Corynebacterium glutamicum has never been engineered for the production of 5AVA, but, a lot of work was done in the last decades to optimize the production of the precursor L-lysine and more recently cadaverine. 5AVA added to the growth medium hardly affected growth rate of C. glutamicum, since, a half-inhibitory concentration of 1.1 M 5AVA was determined. While in E. coli, 5AVA production was engineered by using the DavBA pathway from Pseudomonas putida, here a pathway based on the route described in P. aeruginosa was established. C. glutamicum wild type was converted into a 5AVA producing strain by heterologous expression of L-lysine decarboxylase (LdcC), putrescine transaminase (PatA) and γ-aminobutyraldehyde dehydrogenase (PatD) genes from E. coli. 5AVA production was improved by using a strain previously engineered for high L-lysine production, by de-repressing phosphoenolpyruvate phosphotransferase system (PTS) and glycolysis and by avoiding formation of the by-product L-lactate. 5AVA accumulation by this strain was increased to 44.9 mM, representing a yield of 202 mmol mol-1 glucose, which is about three times higher than the highest yield achieved in E. coli for the production of 5AVA from glucose fermentation.

2016-06-17 | GSE83413 | GEO

Expression data from 15h-grown E. coli

Project description:The production of lycopene in E. coli can be improved by mutated CRP.CRP is a well-known global transcription factor regulating the expression of more than 400 genes that belong to different functional groups of E. coli. During the accumulation of lycopene in E. coli, the engineered CRP alters the expression level of many genes, such as the genes belong to lycopene production pathway, which leads to the improved lycopene production. We used microarrays to detail the gene expression under the condition of engineered CRP and identified distinct classes of up-regulated and down-regulated genes. E. coli growed for 15h was selected for RNA extraction and hybridization on Affymetrix microarrays. As we know that the biggest difference in lycopene production was at 15h during cultivation, so we chose 15h as the time-point.

2016-07-01 | E-GEOD-59067 | biostudies-arrayexpress

Determinants of heat resistance in Escherichia coli AW1.7

Project description:Microarray hybridization of cDNA libraries obtained from exponentially growing or heat-shocked AW1.7 or GGG10 cultures was performed to compare gene expression of these two strains. Expression of selected genes from different functional groups was quantified by quantitative PCR (q-PCR). DnaK, 30S and 50S risobomal subunits were overexpressed in E. coli GGG10 relative to E. coli AW1.7 upon heat shock at 50°C, indicating improved ribosome stability. The outer membrane porin NmpC and several transport proteins were overexpressed in exponentially growing E. coli AW1.7.

2011-03-02 | GSE27607 | GEO

Functional Genomic Study of Exogenous n-Butanol Stress in Escherichia coli

Project description:n-Butanol has been proposed as an alternative biofuel to ethanol, and both Escherichia coli and Saccharomyces cerevisiae have been engineered to produce it. Unfortunately, n-butanol is more toxic than ethanol to these organisms. To understand the basis for its toxicity, cell wide studies were conducted at the transcript, protein and metabolite levels to obtain a global view of the n-butanol stress response. Analysis of the data indicate that n-butanol stress has components common to other stress responses and includes perturbation in respiratory functions (nuo, cyo operons), oxidative stress (sodC, katG, yqhD), heat shock and cell envelope stress (rpoE, clpB, htpG, degP, cpxPR), metabolite transport (malE, opp operon) and biosynthesis. Inducible expression of the yqhD gene was found to improve the host’s tolerance to exogenous n-butanol and confirms the role of this gene in coping with butanol stress. To survey for other potential candidates that may serve to improve host tolerance, mutant strains in several candidates which show changes at the transcript and protein levels were examined for sensitivity during butanol exposure. Chassis engineering based on these cues may be required in a high production titer, butanol-producing host.

2009-12-31 | GSE16973 | GEO

Time-lapse Deep-seq of E. coli Metabolite Production Pathway

Project description:Understand the mechanisms of evolution in large-scale bio-production by tracking population dynamics leading to production decline in mevalonic acid-producing Escherichia coli. Industrial bioproduction entails growth of the production host to large bioreactors (e.g. 1-300 m3). This may put the organism at risk for generating non-producing subpopulations of genetic heterogeneity, which is not phenotypically detected at lab-scale (e.g. 2 L). To study these dynamics, we experimentally simulated these growth durations by passing mevalonic acid-producing E. coli to maintain the populations in exponential growth for 45 generations.

2018-01-19 | E-MTAB-5862 | biostudies-arrayexpress

Expression data from 15h-grown E. coli

2016-07-01 | GSE59067 | GEO

Saccharomyces cerevisiae

Project description:Engineering Yeast Transcription Machinery for Improved Ethanol Tolerance and Production

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Improvement of isopropanol tolerance of Escherichia coli using adaptive laboratory evolution and omics technologies

Project description:To understand the mechanism of isopropanol tolerance of Escherichia coli for improvement of isopropanol production, we performed genome re-sequencing and transcriptome analysis of isopropanol tolerant E. coli strains obtained from parallel adaptive laboratory evolution under IPA stress.

2017-06-21 | GSE89685 | GEO

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