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[求助]
求翻譯一段話，謝謝，站內(nèi)信
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Abstract Actinomycetes have been prolific sources of novel secondary metabolites with a range of biologi- cal activities that may ultimately find application as therapeutic compounds. Hence several drug discovery companies are engaged in isolation of novel bioactive metabolites from these microbial sources. Antibiotics form the major class of such bioactive metabolites and have been widely used for treating infectious diseases. One of the most critical problems in clinical practice is the in- crease of prevalence of drug resistant strains, especially azole resistance among fungi. Due to this, there is a constant need for development of new antifungal antibiotics having novel scaffolds and/or mechanism of action. In our in-house screening program in the quest of novel and superior antifungal compounds, an actinomycetes strain PM0525875 was isolated from a marine inverte- brate. The extracts of this microbe showed potent in-vitro antifungal activity against drug resis- tant fungal strains. The antifungal active peak from the extract obtained by shake flask fermenta- tion was identified by chromatographic and other analytical techniques during bioactivity guided isolation. Later the fermentation conditions were optimized in 30 L fermentor for the production of sufficient amount antifungal compound for complete structural characterization. Consequently the fermented broth extract was subjected to bioactivity-guided fractionation, to isolate the active principle using different preparative chromatographic techniques followed by its characterization. The active principle was characterized to be Caerulomycin A. Minimum inhibitory concentration (MIC) of the compound was found in the range of 0.39 - 1.56 μg/ml against pathogenic fungal test strains. The phylogenetic analysis of producer strain using 16S rRNA sequence showed closest match with Actinoalloateichus cyanogriseus. Herewith we report the isolation of Caerulomycin A from marine invertebrate-associated Actinoalloteichus sp. using optimized medium and fermenta- tion conditions. |
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