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ABSTRACT:
PROVIDER: PRJNA1204205 | ENA |
REPOSITORIES: ENA
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Project description:Purpose: Streptomyces albulus is an industrial producer of ε-poly-L-lysine, an antimicrobial cationic homo poly-amino acid used practically as a natural food preservative. Here, we present RNA sequencing data set unveiling differentially expressed transcripts during ε-poly-L-lysine production in the most extensively studied poly-L-Lys producer, S. albulus NBRC14147. Methods: During the poly-L-Lys fermentation, cells grown for 8 hours and 35 hours were harvested as growth phase cells and production phase cells, respectively, and total RNA were extracted individually. A 100-bp paired-end mRNA sequencing was performed for each sample on the Illumina HiSeq 2500 system. Result: Using an optimized data analysis workflow, we were able to map more than 44 million sequence reads per sample to the reference genome (GenBank accession number ASM385166v1). Differential gene expression analysis was performed using the edgeR. The RNA-seq data revealed that a total of 2449 genes were considered to be differentially expressed during poly-L-Lys production using a fold change cutoff of log2 less than -1 and greater than 1 (equivalent to a ±2-fold change). Conclusion: Our data will serve as a primary source for investigating the regulatory mechanism which govern poly-L-Lys production in S. albulus NBRC14147.
2022-01-19 | GSE192684 | GEO
Project description:ε-poly-L-lysine (ε-PL) is a high value, widely used natural antimicrobial peptide additive for foods and cosmetic products that is mainly produced by S. albulus. In previous work, we developed the high-yield industrial strain S. albulus WG-608 through successive rounds of engineering. Here, we use integrated physiological, transcriptomic, and proteomics association analysis to resolve the complex mechanisms underlying high ε-PL production by comparing WG-608 with the progenitor strain M-Z18. Our results show that key genes in the glycolysis, glyoxylate, and L-lysine biosynthesis pathways are differentially upregulated in WG-608, while genes in the biosynthetic pathways for fatty acids, various branched amino acids, and secondary metabolite by-products are downregulated. This regulatory pattern results in the introduction of more carbon atoms into L-lysine biosynthesis and ε-PL production. Furthermore, transcriptional and translational upregulation of genes involved in the tricarboxylic acid cycle, oxidative phosphorylation, and pentose phosphate pathway also increase the pools of available NADH, ATP, and NADPH. In addition, significant changes in the regulation of DNA replication, transcription, and translation, two component systems, and quorum sensing may facilitate the adaptability to environmental pressure, thus further regulating the ε-PL biosynthesis. This study enables comprehensive understanding of the biosynthetic mechanisms of ε-PL in S. albulus WG-608, while providing a theoretical foundation development of advanced Streptomycetaceae microbial cell factories.
2023-07-20 | PXD036099 | Pride
Project description:An RNA sequencing data set revealing differentially expressed transcripts during ε-poly-L-lysine production in Streptomyces albulus.
| PRJNA792605 | ENA
Project description:We propose an isolation strategy based on a broad-spectrum antimicrobial epsilon-poly-L–lysine (ε-PL) to precipitate bacterial extracellular vesicles (BEVs) at a relatively low centrifugal speed (10,000 × g). Compared to the standard ultracentrifugation (UC) strategy, our method can enrich BEVs from large volumes of media inexpensively and rapidly. The precipitated BEVs can be recovered by adjusting pH and ionic strength of the media, followed by ultrafiltration step to remove ε-PL and achieve buffer exchange. To address whether BEVs isolated by these two methods lead to different host responses, we isolated Escherichia coli (E. coli) and Staphylococcus aureus BEVs from bacterial culture media using ultracentrifugation and our ε-poly- L-lysine-based method, respectively. Then we stimulated THP-1 cells with the isolated BEVs and the global transcript profiles were evaluated by the RNA-seq technique. Compared with the unstimulated THP-1 cells, BEV isolated by both methods could trigger a striking alteration in the gene expression pattern. Among the functions significantly enriched by these DEGs were immune response and leucocyte chemotaxis. The results indicated that the BEVs isolated by the ε-PL-based method also retained the in vitro biological activity as the commonly used ultracentrifugation.
2022-08-02 | GSE207009 | GEO
Project description:We designed D-xylose-modified, epsilon-poly-L-lysine-based carbon dots (D-xyl@epsilonPLCDs) to effectively inhibit intracellular UPEC. D-xyl@εPLCDs effectively entered cells, reduced bacterial adhesion and promoted intracellular UPEC clearance. To investigate the regulation of immune responses in bladder epithelial 5637 cells after treatment with D-xyl@epsilonPLCDs, RNA sequencing analysis were performed.
2024-07-23 | GSE236507 | GEO
Project description:We designed D-xylose-modified, epsilon-poly-L-lysine-based carbon dots (D-xyl@epsilonPLCDs) to effectively inhibit intracellular UPEC. Treatment with D-xyl@epsilonPLCDs ultimately resulted in a reduction of UPEC in the bladders of mouse UTIs model. To investigate the regulation of immune responses in bladders of CFT073-infected mice post-D-xyl@epsilonPLCDs treatment, RNA sequencing analysis were performed.
2024-07-23 | GSE236506 | GEO
Project description:Salmonella Typhimurium is one of the major foodborne pathogens due to its biofilm formation on food contact surfaces. A polymer of positively charged lysine, ε-Polylysine has been demonstrated to inhibit biofilm formation of both Gram-positive and -negative bacteria. To elucidate the mechanism for inhibition of biofilm formation by ε-Polylysine, transcriptional profiles were compared between the cells before and after treatment with ε-Polylysine in Salmonella Typhimurium. A genome-wide DNA microarray analysis was performed after cultivation in 0.1% bacto soytone in the presence of 0.001% ε-Polylysine at 30°C for 2 h. Genes involved in curli and cellulose production, quorum sensing, and flagellar motility were down-regulated, whereas genes associated with colanic acid synthesis were up-regulated. The data from microarray was validated by RT-qPCR. Furthermore, production of colanic acid in S. Typhimurium decreased in the presence of ε-Polylysine. The outcome of this study provides a basic understanding of the anti-biofilm mechanisms of ε-Polylysine and may contributes to develop new disinfectant to control biofilm during food manufacturing and storage.
2019-11-14 | GSE140300 | GEO