Abstract
Streptomyces have been reported as a remarkable source for bioactive secondary metabolites with complex structural and functional diversity. In this study, 35 isolates of genus Streptomyces were purified from rhizospheric and marine soils collected from previously unexplored habitats and screened for antimicrobial activities. One of these isolates, G1, when tested in vitro, was found highly active against wide range of microbes including Gram-positive, Gram-negative bacteria, and different fungal pathogens. It was identified as mesophilic, alkaliphilic, and moderately halotolerant as it showed optimum growth at temperature 30 °C, pH 8.0 in casein-starch-peptone-yeast extract-malt extract medium supplemented with 5% NaCl. Sequence analysis of the 16S rRNA gene indicated 100% identity of this isolate to Streptomyces fimbriatus. Moreover, maximum antimicrobial activity was achieved in starch nitrate medium supplemented with 1% glycerol as carbon and 0.03% soy meal as nitrogen source. The antimicrobial compounds produced by this isolate were extracted in methanol. Bioassay-guided fractionation through thin layer chromatography of methanolic extract resulted in the separation of a most active fraction with an Rf value of 0.46. This active fraction was characterized by FTIR and LCMS analysis and found similar to streptothricin D like antibiotic with m/z 758.42.
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We acknowledge Higher Education Commission (HEC), Pakistan, for providing opportunity to conduct a part of this research project in University of Freiburg, Germany, under International Research Initiative Program (IRSIP).
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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors but a part of this research work has been done during IRSIP training program funded by HEC.
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Neelma Ashraf investigated, wrote original draft and editing. Andreas Bechthold participated in methodology, data curation, and editing. Munir Ahmad Anwar was involved in the investigation and editing of the manuscript. M. Afzal Ghauri reviewed and edited the manuscript. M. Sultan Anjum participated in formal analysis, reviewing and editing. Ali Nisar Khan was involved in methodology development and analysis. Kalsoom Akhtar was involved in writing-reviewing and editing. Shazia Khaliq being a supervisor was involved in conceptualization, administration of the project, provision of resources, writing, reviewing, and editing.
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Ashraf, N., Bechthold, A., Anwar, M.A. et al. Production of a broad spectrum streptothricin like antibiotic from halotolerant Streptomyces fimbriatus isolate G1 associated with marine sediments. Folia Microbiol 66, 639–649 (2021). https://doi.org/10.1007/s12223-021-00870-4
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DOI: https://doi.org/10.1007/s12223-021-00870-4