Similar effects of an NO challenge and an lpdA knockout on transcription of Salmonella enterica sv Typhimurium 14028
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ABSTRACT:
ORGANISM(S): Salmonella enterica Salmonella enterica subsp. enterica serovar Typhimurium
PROVIDER: GSE29735 | GEO | 2011/06/04
SECONDARY ACCESSION(S): PRJNA141157
REPOSITORIES: GEO
Similar Datasets
Project description:Transcriptional profiling of Salmonella enterica sv Typhimurium under NO stress and comparison of profiles between wild type and lpdA mutant cultures. We investigated the bacteriostatic nature of NO·. S. Typhmurium 14028s is prototrophic for all amino acids but cannot synthesize Methionine or Lysine during nitrosative stress. This MK auxotrophy results from reduced availability of succinyl-CoA, a consequence of NO· targeting lipoamide-dependent LpdA activity. LpdA is an essential component of the pyruvate and α-ketoglutarate dehydrogenase complexes. Additional effects of NO· on gene regulation prevent compensatory pathways of succinyl-CoA production. By microarray analysis, more than 50% of the transcriptional response of S. Typhimurium to nitrosative stress is attributable to LpdA inhibition. Two separate two-condition experiment: NO treated versus untreated, wild type versus lpdA mutant. Three biological replicates. Dye swaps performed on two of these.
2011-06-04 | E-GEOD-29735 | biostudies-arrayexpress
Project description:Lysine-succinylation is a subtype of protein acylation associated with metabolic regulation of succinyl-CoA in the TCA cycle. Deficiency of succinyl-CoA synthetase (SCS), the TCA-cycle enzyme catalyzing the reversible conversion of succinyl-CoA to succinate, leads to mitochondrial encephalomyopathy in humans and embryonic lethality in mice. This report presents a conditional forebrain-specific knock-out (KO0 mouse model of Sucla2, the gene encoding the ATP-specific beta isoform of SCS, resulting in postnatal deficiency of the entire SCS complex. Results demonstrate that the accumulation of succinyl-CoA in the absence of SCS leads to hyper-succinylation within the cerebral cortex of adult mice. With previous research identifying succinylation marks on histones, and with proteomic evidence of histone lysine-succinylation within the presented model, global chromatin accessibility was surveyed in Sucla2 mutant and control mice via ATAC-sequencing. Data show wide-scale alterations in chromatin landscape and global gene expression. Computational analysis of combined chromatin-accessibility and gene expression data reveal perturbation of neuronal transcriptional regulatory networks in the mutant forebrain, suggesting SCS-related changes in the protein succinylome and chromatin accessibility play a significant role in the neuronal pathogenesis of SCS-deficiency.
2022-07-27 | GSE208691 | GEO
Project description:Lysine-succinylation is a subtype of protein acylation associated with metabolic regulation of succinyl-CoA in the TCA cycle. Deficiency of succinyl-CoA synthetase (SCS), the TCA-cycle enzyme catalyzing the reversible conversion of succinyl-CoA to succinate, leads to mitochondrial encephalomyopathy in humans and embryonic lethality in mice. This report presents a conditional forebrain-specific knock-out (KO0 mouse model of Sucla2, the gene encoding the ATP-specific beta isoform of SCS, resulting in postnatal deficiency of the entire SCS complex. Results demonstrate that the accumulation of succinyl-CoA in the absence of SCS leads to hyper-succinylation within the cerebral cortex of adult mice. With previous research identifying succinylation marks on histones, and with proteomic evidence of histone lysine-succinylation within the presented model, global chromatin accessibility was surveyed in Sucla2 mutant and control mice via ATAC-sequencing. Data show wide-scale alterations in chromatin landscape and global gene expression. Computational analysis of combined chromatin-accessibility and gene expression data reveal perturbation of neuronal transcriptional regulatory networks in the mutant forebrain, suggesting SCS-related changes in the protein succinylome and chromatin accessibility play a significant role in the neuronal pathogenesis of SCS-deficiency.
2022-07-27 | GSE208690 | GEO
Project description:time course of transcriptional profile of Typhimurium 14028 wt versus 14028 cheY mutant on agar plate Keywords: time-course
2005-08-23 | GSE2340 | GEO
Project description:Background: Salmonella enterica serovar Typhimurium (S. Typhimurium) is a Gram-negative pathogen that must successfully adapt to the broad fluctuations in the concentration of dissolved dioxygen encountered in the host. In Escherichia coli, ArcA (Aerobic Respiratory Control) helps the cells to sense and respond to the presence of dioxygen. The global role of ArcA in E. coli is well characterized; however, little is known about its role in anaerobically grown S. Typhimurium. Results: We compared the transcriptional profiles of the virulent wild-type (WT) strain (ATCC 14028s) and its isogenic arcA mutant grown under anaerobic conditions. We found that ArcA directly or indirectly regulates 392 genes (8.5% of the genome); of these, 138 genes are poorly characterized. Regulation by ArcA in S. Typhimurium is similar, but distinct from that in E. coli. Thus, genes/operons involved in core metabolic pathways (e.g., succinyl-CoA, fatty acid degradation, cytochrome oxidase complexes, flagellar biosynthesis, motility, and chemotaxis) were regulated similarly in the two organisms. However, genes/operons present in both organisms, but regulated differently by ArcA in S. Typhimurium included those coding for ethanolamine utilization, lactate transport and metabolism, and succinate dehydrogenases. Salmonella-specific genes/operons regulated by ArcA included those required for propanediol utilization, flagellar genes (mcpAC, cheV), Gifsy-1 prophage genes, and a few SPI-3 genes (mgtBC, slsA, STM3784). In agreement with our microarray data, the arcA mutant was non-motile, lacked flagella, and was as virulent in mice as the WT. Furthermore, we identified a set of 120 genes whose regulation was shared with the anaerobic redox regulator, Fnr. Conclusion(s): We have identified the ArcA regulon in anaerobically grown S. Typhimurium. Our results demonstrated that in S. Typhimurium, ArcA serves as a transcriptional regulator coordinating cellular metabolism, flagella biosynthesis, and motility. Furthermore, ArcA and Fnr share in the regulation of 120 S. Typhimurium genes.
2011-02-10 | GSE24564 | GEO
Project description:Typically, the expression of sRNAs is activated in response to environmental stimuli in order to regulate gene expression through post-transcriptional mechanisms. In the present work we show that the Salmonella Typhimurium paralog sRNAs RyhB-1 and RyhB-2 are induced in response to the nitrosating agent S-nitrosoglutathione (GSNO). Inactivation of these sRNAs decreased S. Typhimurium resistance to GSNO and increased the levels of nitrosylated proteins. These results prompted us to evaluate a possible role of these sRNAs in nitrosative stress resistance. RNA profiling was used as a screening to identify novel RyhB-1 and RyhB-2 regulated targets, and a subset of genes was filtered based on their potential role in the response to nitrosative stress. To confirm our observation, expression of the candidate targets was analyzed by quantitative RT-PCR in a wild type, single and double mutant strains (M-NM-^TryhB1, M-NM-^TryhB2 and M-NM-^TryhB1 M-NM-^TryhB2) treated with GSNO. In response to GSNO RyhB-1 and RyhB-2 negatively regulate the expression of the genes cyoABC (cytochrome o oxidase complex), cydB (cytochrome d oxidase complex), cybC (cytochrome b-562), and positively regulate the nirBCD operon (nitrite reductase system). Together, these results suggest that RyhB-1 and RyhB-2 finely tune the expression of genes coding for cytochrome and the nitrate reductase system, allowing the cell to cope with GSNO-induced stress. Total RNA was harvested from two biological replicates of wt S. Typhimurium overexpressing the sRNA RyhB-2 grown in LB medium, in order to identify RhyB-2 targets that might be implicated in reactive nitrogen stress resistance.
2014-06-10 | E-GEOD-58110 | biostudies-arrayexpress
Project description:The bacteriostatic and bactericidal effects and the corresponding expression profiles of Mycobacterium tuberculosis to representative oxidative and nitrosative stresses were investigated by growth and survival studies and whole genome expression analysis. The response of M. tuberculosis to a range of hydrogen peroxide (H2O2) concentrations tended to fall into three distinct categories: (1) low level exposure resulted in induction of few H2O2 sensitive genes, (2) intermediate exposure resulted in massive transcriptional changes without an effect on growth or survival, and (3) high exposure resulted in a muted transcriptional response and eventual death. Nitric oxide (NO) exposure initiated much of the same transcriptional response as H2O2. However, unlike H2O2 exposure, NO exposure affected a dose-dependent bacteriostatic activity without killing and induction of dormancy-related genes. Included in the shared response to H2O2 and NO was the induction of genes encoding oxidative stress detoxification and iron-sulfur cluster repair functions. Expression of several key oxidative stress defense genes was constitutive, or increased moderately from an already elevated level, suggesting bacilli that are continually primed for oxidative stress defense. Deletion of the known oxidative stress responsive regulator, FurA, resulted in the constitutive expression of furA, katG, and Rv1907c; while other genes do not appear to be solely controlled by FurA. In contrast to Escherichia coli, M. tuberculosis appears highly resistant to DNA damage-dependent killing caused by low mill molar levels of H2O2. Furthermore, instead of limiting access to iron to prevent hydroxyl radical formation from H2O2 and thus DNA damage, M. tuberculosis induced iron uptake genes in response to H2O2 and NO. Set of arrays that are part of repeated experiments Compound Based Treatment: H2O2 or DETA/NO treatment
2010-05-18 | E-GEOD-16146 | biostudies-arrayexpress
Project description:Typically, the expression of sRNAs is activated in response to environmental stimuli in order to regulate gene expression through post-transcriptional mechanisms. In the present work we show that the Salmonella Typhimurium paralog sRNAs RyhB-1 and RyhB-2 are induced in response to the nitrosating agent S-nitrosoglutathione (GSNO). Inactivation of these sRNAs decreased S. Typhimurium resistance to GSNO and increased the levels of nitrosylated proteins. These results prompted us to evaluate a possible role of these sRNAs in nitrosative stress resistance. RNA profiling was used as a screening to identify novel RyhB-1 and RyhB-2 regulated targets, and a subset of genes was filtered based on their potential role in the response to nitrosative stress. To confirm our observation, expression of the candidate targets was analyzed by quantitative RT-PCR in a wild type, single and double mutant strains (ΔryhB1, ΔryhB2 and ΔryhB1 ΔryhB2) treated with GSNO. In response to GSNO RyhB-1 and RyhB-2 negatively regulate the expression of the genes cyoABC (cytochrome o oxidase complex), cydB (cytochrome d oxidase complex), cybC (cytochrome b-562), and positively regulate the nirBCD operon (nitrite reductase system). Together, these results suggest that RyhB-1 and RyhB-2 finely tune the expression of genes coding for cytochrome and the nitrate reductase system, allowing the cell to cope with GSNO-induced stress.
2014-06-10 | GSE58110 | GEO
Project description:Investigation of whole genome gene expression level changes in a Salmonella enterica serovar Typhimurium 14028 delta GidA mutant The mutant described in this study is further analyzed in Shippy, D. C., N. M. Eakley, P. N. Bochsler, and A. A. Fadl. 2011. Biological and virulence characteristics of Salmonella enterica serovar Typhimurium following deletion of glucose-inhibited division (gidA) gene. Microb Pathog. A single chip study using three separate cultures of wild-type Salmonella enterica serovar Typhimurium 14028 and three separate cultures of a single mutant, delta GidA Salmonella enterica serovar Typhimurium 14028.
2011-07-19 | E-GEOD-30787 | biostudies-arrayexpress
Project description:This study provides comprehensive information about plant responses to nitrosative stress at transcript level and would prove helpful in understanding and incorporating mechanisms associated with nitrosative stress responses in plants.
2016-05-13 | GSE81361 | GEO