Project description:Streptomyces avermitilis is a avermectin producer.Since the avermectin biosynthesis rate has a increased significantly in P3 fermentation stage( P1,24–96 h; P2:96–192 h, P3:192–240 h), but the sugar absorption rate decreased significantly in P3 fermentation stage, in order to improve the titer of avermectins, we conducted transcriptomic analysis of Streptomyces avermitilis S0 in fourth and eighth day, and selected native promoters with appropriate temple using to express sugar transporters.
Project description:Investigation of whole genome gene expression level changes in Streptomyces avermitilis delta-aveI mutant, compared to the wild-type strain. The mutants analyzed in this study are further described in Chen L, Lu Y., Chen J, Zhang W, Shu D, Qin Z, Yang S, Jiang W. (2008) Characterization of a negative regulator AveI for avermectin biosynthesis in Streptomyces avermitilis NRRL8165. Appl Microbiol Biotechnol 80(2): 277-86. A six chip study using total RNA recovered from three separate Streptomyces avermitilis NRRL8165 and three separate cultures of a Streptomyces avermitilis NRRL8165 delta-aveI (delta-l) mutant. 3 separate RMA normalizations performed, one for each pair of control and mutant samples.
Project description:Investigation of whole genome gene expression level changes in Streptomyces avermitilis delta-aveI mutant, compared to the wild-type strain. The mutants analyzed in this study are further described in Chen L, Lu Y., Chen J, Zhang W, Shu D, Qin Z, Yang S, Jiang W. (2008) Characterization of a negative regulator AveI for avermectin biosynthesis in Streptomyces avermitilis NRRL8165. Appl Microbiol Biotechnol 80(2): 277-86.
Project description:Fusarium spp. are fungal pathogens of humans and plants. Fusarium oxysporum and Fusarium solani are important species isolated from infections such as onychomycosis, fungal keratitis, invasive infections, and disseminated diseases. These pathologies have a very difficult therapeutic management and poor therapeutic responses, especially in patients with disseminated infection. Little information is available regarding the molecular mechanisms responsible for antifungal resistance in these fungi. methods: In this study, we performed a quantitative analysis of the transcriptional profile of F. oxysporum and F. solani, challenged with amphotericin B (AMB) and posaconazole (PSC) using RNA-seq. Quantitative real-time reverse transcription PCR (qRT-PCR) was used to validate the results results: Several genes related to mechanisms of antifungal resistance such as efflux pumps, ergosterol pathway synthesis, and responses to oxidative stress were found. Genes such as ERG11, ERG5, the Major Facilitator Superfamily (MFS), thioredoxin, and different dehydrogenase genes may explain the reduced susceptibility of Fusarium spp. against azoles and the possible mechanisms that may play an important role in induced resistance against polyenes. conclusions: Important differences in the levels of transcriptional expression were found between F. oxysporum and F. solani exposed to the two different antifungal treatments. Knowledge on the gene expression profiles and gene regulatory networks in Fusarium spp. during exposure to antifungal compounds, may help to identify possible molecular targets for the development of novel, better, and more specific therapeutic compounds. profile transcriptional of Fusarium spp changed to antifungal treatments in vitro
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.
Project description:Fusarium spp. are fungal pathogens of humans and plants. Fusarium oxysporum and Fusarium solani are important species isolated from infections such as onychomycosis, fungal keratitis, invasive infections, and disseminated diseases. These pathologies have a very difficult therapeutic management and poor therapeutic responses, especially in patients with disseminated infection. Little information is available regarding the molecular mechanisms responsible for antifungal resistance in these fungi. methods: In this study, we performed a quantitative analysis of the transcriptional profile of F. oxysporum and F. solani, challenged with amphotericin B (AMB) and posaconazole (PSC) using RNA-seq. Quantitative real-time reverse transcription PCR (qRT-PCR) was used to validate the results results: Several genes related to mechanisms of antifungal resistance such as efflux pumps, ergosterol pathway synthesis, and responses to oxidative stress were found. Genes such as ERG11, ERG5, the Major Facilitator Superfamily (MFS), thioredoxin, and different dehydrogenase genes may explain the reduced susceptibility of Fusarium spp. against azoles and the possible mechanisms that may play an important role in induced resistance against polyenes. conclusions: Important differences in the levels of transcriptional expression were found between F. oxysporum and F. solani exposed to the two different antifungal treatments. Knowledge on the gene expression profiles and gene regulatory networks in Fusarium spp. during exposure to antifungal compounds, may help to identify possible molecular targets for the development of novel, better, and more specific therapeutic compounds.
Project description:To explore the molecular mechanism of the positive thermoregulation on Jinggangmycin A biosynthesis, the transcriptomes of S. hygroscopicus 5008 cultivated at 30℃ or 37℃ in liquid medium were compared by microarray analysis. Additionally, the transcriptomes of S. avermitilis NRRL8165 cultivated at the same conditions were analyzed in parallel to filter transcriptional changes common to Streptomyces genus.
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. For each of the three species (S. coelicolor, S. avermitilis, S. venezuelae) two libraries were created. The first was a long-read library, where total RNA was depleted of rRNA. The second was a short read library, where total RNA was size selected (40-300 nucleotides) prior to library creation. The long-read library allowed the profiling of mRNAs and asRNAs, while the short-read library was enriched for small RNAs (sRNAs).
Project description:PAS-LuxR transcriptional regulators are highly conserved enzymes governing polyene macrolide antifungal biosynthesis. One of such regulators PteF, is located in the polyene macrolide filipin gene cluster from Streptomyces avermitilis and its mutation leads to a drastic decrease in filipin production as well as a severe loss of oligomycin production, an ATP-synthase inhibitor of macrolide structure, and a delay in sporulation. This transcriptomic study aims to understand the regulatory role of PteF and unveil the reach of PAS-LuxR transcriptional regulators in the global metabolism of Streptomyces.