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.
Project description:The aim of this experiment was to map the transcription start sites (TSSs) in the bottromycin biosynthetic gene cluster from Streptomyces scabies, qualitatively assess the expression levels of this cluster within the bacterium's transcriptome and evaluate whether deletion of a potential regulatory gene in the cluster, btmL affects gene cluster expression.
Project description:ForJ, ForF and ForZ are cluster situated regulators of the formicamycin biosynthetic gene cluster in Streptomyces forimcae. This ChIP Sequencing experiment was conducted to identify where in the genome these regulators bind in order to identify which transcripts they might regulate.
Project description:Here, we report the draft genome sequence of Streptomyces specialis type strain GW41-1564, which was isolated from soil. This 5.87-Mb genome exhibits a high G+C content of 72.72% and contains 5,486 protein-coding genes.
Project description:The production of daptomycin (DAP) is precisely regulated by a complex regulatory network in Streptomyces roseosporus (S. roseosporus). Although the most biosynthetic pathway of DAP has been elucidated, the regulatory mechanism of its biosynthesis at transcriptional level is not fully understood. In the present study, a transcriptional regulator DhyR has been identified based on our previous quantification proteomics identification in S. roseosporus, and further the dhyR gene deletion mutant has been carried out to reveal DhyR function through transcriptome sequencing and loss-of function validation, which demonstrates DhyR positively regulates DAP biosynthesis in S. rosesporus. In-frame gene deletion of dhyR results in the significant downregulation of the transcription levels of all structural genes in DAP biosynthetic gene cluster and significantly decreases production of DAP. In contrast, overexpression of dhyR enhances transcription levels of DAP biosynthetic gene cluster and leads to a 23% increase of DAP yield. Moreover, the deletion of dhyR resultes in the significant down-regulation of transcription levels of another three regulatory genes, including atrA, depR1 and ssig-05090, which have been demonstrated to be closely associated with the DAP biosynthesis. Transcriptome analyses also support that DhyR modulates carbohydrate metabolism, amino acid metabolism and synthesis and transport pathways of siderophore in S. roseosporus. In summary, our findings indicate that DhyR functions as a pleiotropic regulator of primary and secondary metabolism to involve in DAP biosynthetic regulation of S. roseosporus.
Project description:Here, we describe the genome of Streptomyces morookaense DSM 40503, an 8-azaguanine-producing strain. The genome is the basis for future study and presents an underexplored taxonomy and biosynthetic potential, which expands our understanding of the diversity of microorganisms that produce nitrogen heterocyclic compounds.
Project description:<p>Natural products from microorganisms are important sources for drug discovery. With the development of high-throughput sequencing technology and bioinformatics, a large amount of uncharacterized biosynthetic gene clusters (BGCs) in microorganisms have been found, which show the potential for novel natural product production. 9 BGCs containing PKS and/or NRPS in <em>Streptomyces globisporus</em> C-1027 were transcriptionally low/silent under the experimental fermentation conditions, and the products of these clusters are unknown. Thus, we tried to activate these BGCs to explore cryptic products of this strain. We constructed the cluster-situated regulator overexpressing strains which contained regulator gene(s) under the control of the constitutive promoter <em>ermE</em>*p in <em>S. globisporus</em> C-1027. Overexpression of regulators in cluster 26 resulted in significant transcriptional upregulation of biosynthetic genes. With the separation and identification of products from the overexpressing strain OELuxR1R2, 3 <em>ortho</em>-methyl phenyl alkenoic acids (compounds <strong>1-3</strong>) were obtained. Gene disruption showed that compounds <strong>1</strong> and <strong>2</strong> were completely abolished in the mutant GlaEKO, but were hardly affected by deletion of the genes <em>orf3</em> or <em>echA</em> in cluster 26. The type II PKS biosynthetic pathway of chain-extended cinnamoyl compounds was deduced by bioinformatics analysis. This study showed that overexpression of the 2 adjacent cluster-situated LuxR regulator(s) is an effective strategy to connect the orphan BGC to its products.</p>