Heme_k2_Filtered bckg correct trans-norm
Ontology highlight
ABSTRACT:
ORGANISM(S): Lactiplantibacillus plantarum WCFS1 Lactiplantibacillus plantarum
PROVIDER: GSE8744 | GEO | 2007/08/16
SECONDARY ACCESSION(S): PRJNA102011
REPOSITORIES: GEO
Similar Datasets
Project description:We ran for each studied culture (WCFS1 NZ7608 and NZ7603) one aerobe and one anaerobe batch cultivation and designed one experiment. The hybridization scheme of the experiment (6 arrays) was as follows: WCFS1_aerobe NZ7608-aerobe NZ7603-aerobe WCFS1_aerobe and then three extra hybridizations: WCFS1_anaerobe w WCFS1_aerobe; NZ7608_anaerobe NZ7608_aerobe; and NZ7603_anaerobe NZ7603_aerobe. In the experiment we compared (1) the effect of oxygen in each studied culture and (2) the difference in response toward aerobe and anaerobe conditions of each mutant compared to the wild type Keywords: comparative genomic hybridization
2007-08-16 | GSE8743 | GEO
Project description:In this experiment we analyzed the impact of the disruption of trxB1in Lactobacillus plantarum at the transcriptome level. Furthermore we studied the effect of 3.5 mM peroxide effect on both Lactobacillus plantarum wild type (strain WCFS1) and a trxB1 mutant (strain NZ7608). Keywords: mutant analysis of trxB1, hydrogen peroxide stress
2007-08-09 | GSE8672 | GEO
Project description:Background Microorganisms adapt their transcriptome by integrating multiple chemical and physical signals from their environment. Shake-flask cultivation does not allow precise manipulation of individual culture parameters and therefore precludes a quantitative analysis of the (combinatorial) influence of these parameters on transcriptional regulation. Steady-state chemostat cultures, which do enable accurate control, measurement and manipulation of individual cultivation parameters (e.g. specific growth rate, temperature, identity of the growth-limiting nutrient) appear to provide a promising experimental platform for such a combinatorial analysis. Results A microarray compendium of 170 steady-state chemostat cultures of the yeast Saccharomyces cerevisiae is presented and analyzed. The 170 microarrays encompass 55 unique conditions, which can be characterized by the combined settings of 10 different cultivation parameters. By applying a regression model to assess the impact of (combinations of) cultivation parameters on the transcriptome, most S. cerevisiae genes were shown to be influenced by multiple cultivation parameters, and in many cases by combinatorial effects of cultivation parameters. The inclusion of these combinatorial effects in the regression model led to higher explained variance of the gene expression patterns and resulted in higher function enrichment in subsequent analysis. We further demonstrate the usefulness of the compendium and regression analysis for interpretation of shake-flask-based transcriptome studies and for guiding functional analysis of (uncharacterized) genes and pathways. Conclusions Modeling the combinatorial effects of environmental parameters on the transcriptome is crucial for understanding transcriptional regulation. Chemostat cultivation offers a powerful tool for such an approach. Keywords: chemostat steady state samples
2009-02-05 | GSE11452 | GEO
Project description:The effect of respiration (aerobic cultivation in the presence of heme and vitamin K2) was compared with unsupplemented aerobic cultivation with Lactobacillus plantarum.
2010-01-01 | GSE18432 | GEO
Project description:The effect of nitrate reduction (anaerobic cultivation in the presence of heme, vitamin K2 and nitrate) was compared with anaerobic cultivation supplemented with citrate (Lactobacillus plantarum). The medium was chemically defined medium with mannitol as main carbon source
2010-01-01 | GSE18339 | GEO
Project description:Over expression of recombinant proteins is known to cause a metabolic burden to the host cells which leads to down regulation of both growth rates and protein expression. Most studies in this regard have been conducted in low density shake flask cultures which does not capture the essential features of an industrial scale bioprocess. In the present work we studied the transcriptomic profiling at different specific growth rates while expressing the recombinant human interferon beta in fed batch cultures with complex media. These conditions mimicked the industrial fermentations for recombinant proteins.
2011-04-07 | GSE28412 | GEO
Project description:The effect of nitrate reduction (anaerobic cultivation in the presence of heme, vitamin K2 and nitrate) was compared with anaerobic cultivation supplemented with citrate (Lactobacillus plantarum). The medium was chemically defined medium with mannitol as main carbon source Two-condition experiment, nitrate vs citrate reducing cells. Biological replicates: 4 nitrate reducing cultures, 4 citrate reducing cultures, independently grown and harvested. Two slides were used, each slide contained 8 Arrays. Citrate reducing cultures are called reactor 1-4, Nitrate reducing cultures are called reactor A-D
2010-05-16 | E-GEOD-18339 | biostudies-arrayexpress
Project description:To obtain insight in the genome-wide response of heterologous carotenoid production in Saccharomyces cerevisiae, we have analyzed the transcriptome of S. cerevisiae strains overexpressing carotenogenic genes from the yeast Xanthophyllomyces dendrorhous. For this purpose, two strains producing different levels of carotenoids were grown in carbon-limited continuous cultures and genome-wide expression was analyzed. The strain producing low carotenoid levels did not exhibit a clear genome-wide transcriptional response, suggesting that low carotenoid levels do not result in cellular stress. Transcriptome analysis of a strain producing high carotenoid levels resulted in specific induction of genes involved in pleiotropic drug resistance (PDR). These genes encode ATP-binding cassette (ABC) type transporters and major facilitator transporters which are involved in secretion of toxic compounds out of cells. Our results suggest that production of high amounts of carotenoids in S. cerevisiae lead to toxicity and that these cells are prone to secrete carotenoids out of the cell. Indeed, secretion of ï¢-carotene into sunflower oil was observed upon addition of this hydrophobic solvent to the growth medium. Finally, it was observed that deletion of the ABC transporter pdr10, one of the induced PDR transporters, highly decreased the transformation efficiency of an episomal vector containing carotenogenic genes. The few colored transformants that were obtained had decreased growth rates and lower carotenoid production levels compared to control strains transformed with the same carotenogenic genes. These results indicate that Pdr10 might be specifically involved in carotenoid tolerance in S. cerevisiae strains. Experiment Overall Design: The genome wide transcriptional response of S. cerevisiae cells that heterologously produce carotenoids might provide information concerning the impact of carotenoid production on yeast physiology and might identify bottlenecks relevant for the production of these compounds. DNA microarray experiments have been proven to be a powerful tool to study the genome wide transcriptional response of S. cerevisiae to changes of the physiological state and the environment (for example 3,. Genomics approaches on cells producing heterologous metabolites to study their impact on yeast physiology have not been reported yet for S. cerevisiae. Additionally, most transcriptome studies with S. cerevisiae have been performed with cells grown in shake flasks cultures. The main drawback of shake flask cultivation is that the environment is continuously changing, which may be of high influence on carotenoid production, and interpretation of transcriptome data . Chemostat cultivation offers advantages for studies with DNA microarrays because it enables cultivation of microorganisms under tightly defined environmental conditions. An interlaboratory comparison of transcriptome data obtained in chemostat cultures has indeed demonstrated that the accuracy and reproducibility of this approach are superior to those obtained in previous studies with shake-flask cultures .
2008-06-18 | E-GEOD-8451 | biostudies-arrayexpress
Project description:Lactobacillus plantarum WCFS1 was grown under anaerobic carbon-limited conditions in a chemostat with complete biomass retention (retentostat). In this cultivation system, the biomass concentration progressively increases while the dilution rate is kept constant, resulting in decreased specific susbtrate availibility, and hence, a progressive decrease in the specific growth rate. During the progressive transition from growth to virtually no growth, the global changes occurring at the level of metabolism and gene expression were studied using a genome-scale metabolic model and DNA microarrays.
2010-01-01 | GSE18340 | GEO
Project description:Corynebacterium glutamicum is well-known as an industrial workhorse, most notably for its use in the bulk production of amino acids in the feed and food sector. Fast growth and robustness against oscillatory oxygen availability, which can occur in large-scale bioreactors, are advantageous properties of this bacterium. However, previous studies of the effect of gradients in scale-down reactors with complex media disclosed an accumulation of several carboxylic acids and a parallel decrease of growth and product accumulation by C. glutamicum. This study addresses the impact of carboxylic acids, e.g. acetate and L-lactate, on the cultivation process and their potential role in scale up related performance losses. In order to mimic a discontinuous oxygen supply, a fluctuating power input in shake flask and stirred tank cultivations with mineral salt was applied. One focus of this study is to identify relative changes in the proteome due to the differing availability of carboxylic acids under discontinuous oxygen supply.
2019-03-14 | PXD012760 | Pride