Investigation of the Molecular Action of Actinorhodin
Ontology highlight
ABSTRACT:
ORGANISM(S): Staphylococcus aureus
PROVIDER: GSE97007 | GEO | 2017/09/21
SECONDARY ACCESSION(S): PRJNA380398
REPOSITORIES: GEO
Similar Datasets
Project description:Several two-component systems of Streptomyces coelicolor, a model organism to study antibiotic production in Streptomyces, affects the expression of the bfr (SCO2113) gene, which codifies for a bacterioferritin, a protein involved in iron storage. The ∆bfr mutant has a delay in morphological differentiation and pigmented antibiotic production (actinorhodin and undecylprodigiosin) on complex media. The effect of iron in minimal medium was also tested in the wild type and the ∆bfr mutant, and we observed different production of the two pigmented antibiotics in minimal medium, with differences between strains depending on iron concentration and the medium (solid or liquid). Contrary to expected, no intracellular iron differences were detected between the two strains, but there is a higher level of reactive oxygen species in the ∆bfr mutant and a higher tolerance to oxidative stress. Proteomics analysis showed no variation in iron response proteins and a lower abundance of proteins related to actinorhodin, ribosomal proteins and others related to secondary metabolism production and differentiation. On the contrary, it revealed a higher abundance of proteins related to different kind of stresses such as respiration and hypoxia, among others. The bacterioferritin of S. coelicolor is a new element in the complex regulation of the secondary metabolism in S. coelicolor and iron acts as a signal to modulate the biosynthesis of active molecules.
2024-09-09 | PXD050869 | Pride
Project description:We investigated a novel, simple approach to induce the production of cryptic secondary metabolites in actinomycetes by stimulating the organism with high-intensity monochromatic green light (180 radiation unit). Streptomyces coelicolor A3(2) produces blue antibiotic actinorhodin (ACT) and red antibiotic undecylprodigiosin (RED). Using these two pigment antibiotics as indicators, we found that sporulation acceleration and regulation of the antibiotic production pathways can be induced by using high-intensity monochromatic green LEDs. Therefore, we investigated the immediate response of S. coelicolor A3(2) gene expression to the strong green LED stimulation.
2023-12-10 | E-MTAB-12876 | biostudies-arrayexpress
Project description:Genome-wide expression analysis of 6 batch cultivations of actinorhodin-producing wild type and recombinant strain of Streptomyces coelicolor
2010-05-25 | E-MTAB-306 | biostudies-arrayexpress
Project description:The Streptomyces coelicolor two genes operon SCO5784-SCO5785 encodes a two-component system which functions in a similar manner to that of the Bacillus subtilis DegS-DegU system. Propagation of the regulatory gene in high copy number results in the overproduction of several extracellular enzymes, among them the major extracellular protease, as well as in a higher level of synthesis of the antibiotic actinorhodin. This two-component system seems to control various processes characterised by the transition from primary to secondary metabolism in S. coelicolor, as determined by proteomic and transcriptomic analices. The presence of the regulatory gene in high copy number in S. coelicolor additionally seems to elicit a stringent response in the bacterial cell. Therefore, we propose renaming S. coelicolor genes SCO5784 and SCO5785 as degS and degU, respectively.
2012-05-04 | GSE23195 | GEO
Project description:To identify unique gene expression in higher antibiotics producing Streptomyces coelicolor strain, non-producer M1146 and the derivative strain M1146+ACT (M1146 with actinorhodin biosynthetic genes cluster) was choosen for comparative transcriptome analysis. The genes with different gene expression might be key genes important for antibiotics production.
2020-11-27 | GSE155796 | GEO
Project description:CutRS was the first two-component system to be identified in Streptomyces species and is highly conserved in this genus. It was reported >25 years ago that deletion of cutRS increases the production of the antibiotic actinorhodin in Streptomyces coelicolor but despite this early work the function of CutRS has remained enigmatic until now. Here we show that deletion of cutRS upregulates the production of the actinorhodin biosynthetic enzymes up to 260-fold in the cutRS mutant, explaining the increase in actinorhodin production. However, while ChIP-seq identified 86 CutR binding sites in S. coelicolor none of these are in the actinorhodin BGC, so the effect is indirect. The directly regulated CutR targets identified in this study are implicated in extracellular protein folding, including two of the four highly conserved the HtrA-family foldases, HtrA3 and HtrB and a putative VKOR enzyme which is predicted to recycle DsbA following its catalysis of disulphide bond formation in secreted proteins. We thus tentatively propose a role for CutRS in sensing and responding to protein misfolding outside the cell. Since actinorhodin can oxidise cysteine residues and induce disulphide bond formation in proteins its over production in the ∆cutRS mutant may be a response to protein misfolding on the extracellular face of the membrane.
2023-06-12 | GSE225370 | GEO
Project description:Background The genomes of Streptomyces coelicolor and Streptomyces lividans bear a considerable degree of orthology. While S. coelicolor is the model streptomycete for studying antibiotic synthesis and differentiation, S. lividans is almost exclusively considered as the preferred host, among actinomycetes, for cloning and expression of exogenous DNA. We used whole genome microarrays as a comparative genomics tool for identifying the subtle yet crucial differences between these two chromosomes. Results We identified five large S. coelicolor genomic islands (≥25 kb) and 18 smaller islets absent in S. lividans chromosome. Many of these regions show anomalous GC bias and codon usage patterns. Six of them are in close vicinity of tRNA genes while nine are flanked with near perfect repeat sequences indicating that these are probable recent evolutionary acquisitions into S. coelicolor. Embedded within these segments are at least four DNA methylases and two probable methyl-sensing restriction endonucleases. Comparison with S. coelicolor transcriptome and proteome data revealed that some of the missing genes are active during the course of growth and differentiation in S. coelicolor. In particular, a pair of methylmalonyl CoA mutase (mcm) genes involved in polyketide precursor biosynthesis, an acyl-CoA dehydrogenase implicated in timing of actinorhodin synthesis and bldB, a developmentally significant regulator whose mutation causes complete abrogation of antibiotic synthesis belong to this category. Conclusion Our findings provide tangible hints for elucidating the genetic basis of important phenotypic differences between these two streptomycetes. Importantly, absence of certain genes in S. lividans identified here could potentially explain the relative ease of DNA transformations or the conditional lack of actinorhodin synthesis in S. lividans. Further genetic studies based on these results will enable one to target specific sequences in the genetically well-characterized S. coelicolor to adapt it for industrial processes. Keywords: Comparative Genomic Hybridization
2007-06-08 | GSE7167 | GEO
Project description:We report the mRNA and small RNA transcriptomes of Streptomyces coelicolor, Streptomyces avermitilis, and Streptomyces venezuelae. We identified dozens of new conserved sRNAs and antisense RNAs, including a prominent group of antisense RNAs termed ‘cutoRNAs’ that result from overlap of the 3′ ends of convergently transcribed mRNAs. In addition, we observed abundant unique ncRNAs, including many within secondary metabolic gene clusters.
2013-08-01 | GSE46008 | GEO
Project description:The Streptomyces coelicolor two genes operon SCO5784-SCO5785 encodes a two-component system which functions in a similar manner to that of the Bacillus subtilis DegS-DegU system. Propagation of the regulatory gene in high copy number results in the overproduction of several extracellular enzymes, among them the major extracellular protease, as well as in a higher level of synthesis of the antibiotic actinorhodin. This two-component system seems to control various processes characterised by the transition from primary to secondary metabolism in S. coelicolor, as determined by proteomic and transcriptomic analices. The presence of the regulatory gene in high copy number in S. coelicolor additionally seems to elicit a stringent response in the bacterial cell. Therefore, we propose renaming S. coelicolor genes SCO5784 and SCO5785 as degS and degU, respectively. All microarray analyses were performed with RNA samples obtained from three independent cultures grown under identical conditions. Hybridisation assays were carried out with cDNA obtained from RNA extracted at the late exponential phase of growth (24h). The transcriptional profile of wild type (S. coelicolor M145) cells carrying the multicopy plasmid pIJ487 was compared with that of the same strain carrying the degU gene cloned in the same plasmid under the control of its own promoter (S. coelicolor M28). And the transcriptional profile of wild type (S, coelicolor M145) cells was compared to that of the DegU deficient strain (S. coelicolor I32).
2012-05-03 | E-GEOD-23195 | biostudies-arrayexpress
Project description:In this work, we demonstrate that the addition of the small molecule elicitor ARC2 to Streptomyces coelicolor cultures results in global changes in gene expression including many secondary metabolic genes. A profile of the Streptomyces coelicolor transcriptome in the absence and presence of ARC2 was performed by RNA-seq. Total RNA was extracted after 10 hours of treatment with either the DMSO solvent control or the ARC2 small molecule elicitor. A V2 rapid run mode with paired-end 2x75 bp reads on the Illumina HiSeq platform was performed for RNA sequencing.
2021-02-26 | GSE167526 | GEO