Listeria monocytogenes EGD-e
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ABSTRACT:
PROVIDER: PRJNA221635 | ENA |
REPOSITORIES: ENA
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Project description:Transcriptional profile of wild type L. monocytogenes (EGDe) and a pycA mutant strain was compared on growth in BHI. The human pathogen L. monocytogenes is a facultatively intracellular bacterium that survives and replicates in the cytosol of many mammalian cells. The listerial metabolism, especially under intracellular conditions , is still poorly understood. Recent studies analyzed the carbon metabolism of L. monocytogenes by the 13C-isotopologue perturbation method in a defined minimal medium containing [U-13C6]glucose. It was shown that these bacteria produce oxaloacetate mainly by carboxylation of pyruvate due to an incomplete tricarboxylic acid cycle. Here we report that a pycA insertion mutant defective in pyruvate carboxylase (PYC) still grows, albeit at a reduced rate, in BHI medium, but is unable to multiply in a defined minimal medium with glucose or glycerol 36 as carbon source. Transcriptional profiling was performed on the pycA mutant and the wild type strain grown in BHI to get a closer insight into the effect of the pycA mutation in Listeria monocytogenes.
2010-02-10 | GSE19014 | GEO
Project description:In vivo transcriptome of Listeria monocytogenes EGDe
| PRJNA109977 | ENA
Project description:Transcriptional profile after growth in MM (minimal medium (Premaratne et al. 2001) supplemented with 50 mM Glucose. Note: strain "EGD" has not been deposited at ATCC/NCTC. It is a derivative of the original Murray strain (Murray et al. 1926), obtained from S.H.E. Kaufmann. Strain "EGD-e" has been obtained from H. Hahn (Berlin) via T. Chakraborty (Gießen) and is deposited under ATTC BAA-679 and in the Pasteur culture collection. Keywords: strain comparison
2008-12-01 | GSE12146 | GEO
Project description:Transcriptional profile of wild type L. monocytogenes (EGDe) and a pycA mutant strain was compared on growth in BHI. The human pathogen L. monocytogenes is a facultatively intracellular bacterium that survives and replicates in the cytosol of many mammalian cells. The listerial metabolism, especially under intracellular conditions , is still poorly understood. Recent studies analyzed the carbon metabolism of L. monocytogenes by the 13C-isotopologue perturbation method in a defined minimal medium containing [U-13C6]glucose. It was shown that these bacteria produce oxaloacetate mainly by carboxylation of pyruvate due to an incomplete tricarboxylic acid cycle. Here we report that a pycA insertion mutant defective in pyruvate carboxylase (PYC) still grows, albeit at a reduced rate, in BHI medium, but is unable to multiply in a defined minimal medium with glucose or glycerol 36 as carbon source. Transcriptional profiling was performed on the pycA mutant and the wild type strain grown in BHI to get a closer insight into the effect of the pycA mutation in Listeria monocytogenes. RNA from the two strains were isolated after growth in BHI and and compared using whole genome oligonucleotide microarrays
2010-02-09 | E-GEOD-19014 | biostudies-arrayexpress
Project description:The phenotypic and gene expression traits conferred by the alternative sigma factor protein σL in the food-borne pathogen L. monocytogenes were investigated. σL was shown to be important for the efficient growth of this pathogen exposed to food preservative measures such as low storage temperatures, elevated osmolarity and acidity. Based on high throughput phenotypic analysis, σL function was also found to be protective in L. monocytogenes EGDe cells exposed to several antimicrobial compounds including some of the antibiotics currently applied in listeriosis treatment. The expression of flagella genes and motility were significantly compromized upon loss of σL function. A comparative transcriptome analysis of exponential growth EGDe wild type and sigL null cells unveiled 394 genes that are positively controlled through σL dependent transcriptional regulation mechanisms in this bacterium during growth at low (3°C) and optimized (37°C) temperature conditions. Genes identified indicate that σL is a pleitropic transcription regulator mediating positive expression control of genes involved in diverse cellular processes including protein synthesis, molecular transport, energy metabolism, respiration, transcription regulation, metabolite biosynthesis, and cell envelope composition modification. Overall our observations have revealed that the loss of σL function leads to extensive gene expression defects in L. monocytogenes EGDe cells, and these are consistent with compromized nutrient assimilation, energy metabolism, protein synthesis, and metabolite biosynthesis processes as well as altered cell envelope composition and motility. Numerous gene expression changes imposed by σL loss in EGDe are thus also consistent with pleiotropic phenotypic defects detected in the L. monocytogenes EGDe ∆sigL strain.
2012-01-01 | GSE32434 | GEO
Project description:Transcriptional profile of prfA, the dependent genes and the PTS genes after growth in BHI (brain-heart-infusion), LB (Luria Bertani broth) and MM (minimal medium (Premaratne et al. 2001) (each supplemented with 50 mM Glucose). Keywords: media comparison
2008-12-01 | GSE12143 | GEO
Project description:Transcriptional profile of prfA, the dependent genes and the PTS genes after growth in MM (minimal medium (Premaratne et al. 2001) supplemented with 50 mM glucose, cellobiose or glycerol. Keywords: prfA overexpressing strains
2008-12-01 | GSE12145 | GEO
Project description:Analysis of σL dependent traits based on phenotypic and transcriptomic evaluation of the Listeria monocytogenes EGDe strain
| PRJNA147893 | ENA
Project description:Gene expression changes in L. monocytogenes EGDe during lag-phase associated cold acclimation were succesfully defined through expression profiling
2013-04-19 | GSE46182 | GEO
Project description:The phenotypic and gene expression traits conferred by the alternative sigma factor protein M-OM-^CL in the food-borne pathogen L. monocytogenes were investigated. M-OM-^CL was shown to be important for the efficient growth of this pathogen exposed to food preservative measures such as low storage temperatures, elevated osmolarity and acidity. Based on high throughput phenotypic analysis, M-OM-^CL function was also found to be protective in L. monocytogenes EGDe cells exposed to several antimicrobial compounds including some of the antibiotics currently applied in listeriosis treatment. The expression of flagella genes and motility were significantly compromized upon loss of M-OM-^CL function. A comparative transcriptome analysis of exponential growth EGDe wild type and sigL null cells unveiled 394 genes that are positively controlled through M-OM-^CL dependent transcriptional regulation mechanisms in this bacterium during growth at low (3M-BM-0C) and optimized (37M-BM-0C) temperature conditions. Genes identified indicate that M-OM-^CL is a pleitropic transcription regulator mediating positive expression control of genes involved in diverse cellular processes including protein synthesis, molecular transport, energy metabolism, respiration, transcription regulation, metabolite biosynthesis, and cell envelope composition modification. Overall our observations have revealed that the loss of M-OM-^CL function leads to extensive gene expression defects in L. monocytogenes EGDe cells, and these are consistent with compromized nutrient assimilation, energy metabolism, protein synthesis, and metabolite biosynthesis processes as well as altered cell envelope composition and motility. Numerous gene expression changes imposed by M-OM-^CL loss in EGDe are thus also consistent with pleiotropic phenotypic defects detected in the L. monocytogenes EGDe M-bM-^HM-^FsigL strain. Gene expression DNA-microarray. Two-color hybridizations on 8*15K Agilent arrays. Wild type and three KO mutants in three temperatures, three biological replicates in each condition.
2012-01-01 | E-GEOD-32434 | biostudies-arrayexpress