Functional genomics uncovers pleiotropic role of rhomboids in C. glutamicum
Ontology highlight
ABSTRACT:
INSTRUMENT(S): HS4800 hybridization station
ORGANISM(S): Corynebacterium glutamicum ATCC 13032
SUBMITTER: Stefan Albaum
PROVIDER: E-MTAB-2558 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:Muconic acid production from engineered Corynebacterium glutamicum. Gene expression analysis in the pathway redesigned Corynebacterium glutamicum
2018-11-30 | E-MTAB-7350 | biostudies-arrayexpress
Project description:Background: Methanol is present in most ecosystems and may also occur in industrial applications, e.g. as an impurity of carbon sources such as technical glycerol. Methanol often inhibits growth of bacteria, thus, methanol tolerance may limit fermentative production processes. Results: The methanol tolerance of the amino acid producing soil bacterium Corynebacterium glutamicum was improved by genetic adaption in the presence of methanol. The resulting strain Tol1 exhibited significantly increased growth rates in the presence of up to 1 M methanol. However, neither transcriptional changes nor increased enzyme activities of the linear methanol oxidation pathway were observed, which was in accordance with the finding that tolerance to the downstream metabolites formaldehyde and formate was not improved. Genome sequence analysis of strain Tol1 revealed two point mutations potentially relevant to enhanced methanol tolerance: one leading to the amino acid exchange A165T of O-acetylhomoserine sulfhydrolase MetY and the other leading to shortened CoA transferase Cat (Q342*). Introduction of either mutation into the genome of C. glutamicum wild type increased methanol tolerance and introduction of both mutations into C. glutamicum was sufficient to achieve methanol tolerance almost indistinguishable from that of strain Tol1. Conclusion: The methanol tolerance of C. glutamicum can be increased by two point mutations leading to amino acid exchange of O-acetylhomoserine sulfhydrolase MetY and shortened CoA transferase Cat. Introduction of these mutations into producer strains may be helpful when using carbon sources containing methanol as component or impurity. The gene expression was analyzed in the methanol tolerant strain Tol1 in comparison to the C. glutamicumWT. Direct comparison in LB complex medium and analysis of expression response to methanol addition in mCGXII minimal medium with 100 mM glucose.
2015-08-01 | E-GEOD-71590 | biostudies-arrayexpress
Project description:The exploration of scale-down models to imitate the influence of large scale bioreactor inhomogeneities on cellular metabolism is a topic with increasing relevance. While gradients of substrates, pH, or dissolved oxygen are often investigated, oscillating CO2/HCO3- levels, a typical scenario in large industrial bioreactors, is rarely addressed. Hereby, we investigate the metabolic and transcriptional response in Corynebacterium glutamicum wild type as well as the impact on L-lysine production in a model strain exposed to pCO2 gradients of (75-315) mbar. A novel three-compartment cascade bioreactor system was developed and characterized that offers high flexibility for installing gradients and residence times to mimic industrial-relevant conditions, and provides the potential of accurate carbon balancing. The phenomenological analysis of cascade fermentations imposed to the pCO2 gradients at industry-relevant residence times of about 3.55 min did not significantly impair the process performance, with growth and product formation being similar to control conditions. However, transcriptional analysis disclosed up to 66 differentially expressed genes already after 3.55min under stimulus exposure, with the overall change in gene expression directly correlateable to the pCO2 gradient intensity and the residence time of the cells.
2014-05-15 | E-MTAB-2585 | biostudies-arrayexpress
Project description:The Gram-positive soil bacterium Corynebacterium glutamicum is widely used in industrial fermentative processes for the production of amino acids. The world production of L-lysine has surpassed 2 million tons per year. Glucose is taken up into the C. glutamicum cell by the phosphotransferase system PTS which can be replaced and/or enhanced by a permease and a glucokinase. Heterologous expression of the gene for the high-affinity glucose permease from Streptomyces coelicolor and of the Bacillus subitilis glucokinase gene fully compensated for the absence of the PTS in ï??hpr strains and strains grew as fast with glucose as C. glutamicum wild type. Growth of PTS-positive strains with glucose was accelerated when the endogenous inositol permease IolT2 and the glucokinase from Bacillus subtilis were overproduced using plasmid pEKEx3-IolTBest. When the genome-reduced C. glutamicum strain GRLys1 carrying additional in-frame deletions of sugR and ldhA to derepress glycolytic and PTS genes and to circumvent formation of L-lactate as by-product was transformed with this plasmid, a 40% higher L-lysine titer and a 30% higher volumetric productivity as compared to GRLys1(pEKEx3) resulted. The non-proteinogenic amino acid pipecolic acid (L-PA), a precursor of immunosuppressants, peptide antibiotics or piperidine alkaloids, can be derived from L-lysine. To enable production of L-PA by the L-lysine producing strain, the L-Lysine dehydrogenase gene lysDH from Silicibacter pomeroyi and the endogenous pyrroline 5-carboxylate reductase gene proC were expressed as synthetic operon. This enabled C. glutamicum to L-PA with a yield of 0.49 ± 0.03 gg-1 and a volumetric productivity of 0.04 ± 0.00 gL-1h-1.To the best of our knowledge, this is the first fermentative process for the production of L-PA. Two conditions tested, 200 mM NaCl Vs 200 mM pipecolic supplemented in the culture medium, control experiments done with the addition of 200mM of NaCl. Four technical replicates.
2016-03-30 | E-GEOD-79690 | biostudies-arrayexpress
Project description:Corynebacterium glutamicum, a gram-positive soil bacterium used for the industrial production of amino acids such as L-glutamate and L-lysine, is able to use a number of different nitrogen sources, such as ammonium, urea, or creatinine. In this communication, we show that L-glutamine serves as an excellent nitrogen source for C. glutamicum and allows similar growth rates in glucose minimal medium as ammonium. A transcriptome comparison revealed a strong induction of the nitrogen starvation response when glutamine was used as nitrogen source. Subsequent growth experiments with a variety of mutants defective in nitrogen metabolism showed that glutamate synthase is crucial for glutamine utilization, while a putative glutaminase is dispensable under the experimental conditions used. The fact that the glutamate synthase encoding gltBD operon is under strict nitrogen control explains the necessity for induction of the nitrogen starvation response. The paradox situation that the nitrogen starvation response is induced although intracellular L-glutamine levels are high has implications on nitrogen sensing. In contrast to other gram-positive and gram-negative bacteria such as Bacillus subtilis, Salmonella typhimurium, and Klebsiella pneumoniae, a drop in glutamine concentration obviously does not serve as a nitrogen starvation signal in C. glutamicum. Three biological replicates were performed. To analyse how L-glutamine influences global gene expression when used as sole nitrogen source instead of ammonium, DNA microarray analyses were performed. For this purpose RNA was isolated from exponentially growing cells cultivated in CgXII medium containing glucose as carbon source and either L-glutamine or ammonium sulphate as nitrogen source.
2010-10-05 | E-GEOD-19779 | biostudies-arrayexpress
Project description:Recently, we established Corynebacterium glutamicum as a suitable production host for various bacteriocins including garvicin Q (GarQ). Here, we establish secretion of GarQ by C. glutamicum via the Sec translocon. At neutral pH, the cationic peptide is efficiently adsorbed to the negatively charged envelope of producer bacteria limiting availability of the bacteriocin in culture supernatants. Using a reporter strain and proteomic analyses, we identified HtrA, a protease associated with secretion stress, as another potential factor limiting GarQ production.
2024-01-08 | PXD046499 | Pride
Project description:The OsnR contains an XRE (Xenobiotics Response Element) family domain located near the C-terminus from amino acid residue 66–122. A helix-turn-helix is found in the domain.The OsnR play a negative regulatory role in redox-dependent oxidative-stress responses.This ChIP-Seq was carried out to determine unambiguously if OsnR functions as a transcription factor in Corynebacterium glutamicum.
2021-10-21 | E-MTAB-11048 | biostudies-arrayexpress
Project description:To identify genes which are differentially expressed in Corynebacterium glutamicum in the cg2460 deletion strain, we performed DNA microarray analyses of C. glutamicum Δcg2460 compared to the WT.
2019-07-11 | GSE123974 | GEO
Project description:To identify genes which are differentially expressed in Corynebacterium glutamicum in the cg2699 deletion strain, we performed DNA microarray analyses of C. glutamicum Δcg2699 compared to the WT.
2018-08-28 | GSE117566 | GEO
Project description:The alarmone species ppGpp and pppGpp are an important part of bacterial physiology as they both coordinate the bacterial stress response to nutrient deficiency and also contribute to the maintenance of cell homeostasis. Recently, all components of the (p)ppGpp metabolism for the industrially relevant actinobacterial model organism Corynebacterium glutamicum could be functionally characterized by in vitro analysis and heterologous expression in the model system Escherichia coli. Based on these results, the strain C. glutamicum CR099 ΔrelΔrelSΔrelH is the first C. glutamicum (p)ppGpp0 strain available. The aim of this study was to investigate the effects of the alarmone species on transcriptome regulation in C. glutamicum by differential transcriptome analysis of the parental strain and the (p)ppGpp0 mutant. An RNAseq analysis of the early exponential growth phase was performed to analyze the (p)ppGpp basal level effects (Illumina TruSeq stranded mRNA libraries sequenced on Illumina HiSeq rapid mode 2 x 25nt PE). Due to the direct association of the alarmones with the bacterial stress response, the transcriptional response to the induction of a total starvation situation was investigated in form of a time series. Following an analysis of pooled replicates for 5 time points (Illumina TruSeq stranded mRNA libraries sequenced on Illumina HiSeq rapid mode 2 x 50nt PE), a detailed investigation was carried out for two stress exposure durations using three biological replicates per strain and time point each (Illumina TruSeq stranded mRNA libraries sequenced on Illumina HiSeq rapid mode 2 x 25nt PE).
2019-12-02 | E-MTAB-8070 | biostudies-arrayexpress