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• W2998202207 endingPage "e0226959" @default.
• W2998202207 startingPage "e0226959" @default.
• W2998202207 abstract "Literature surveys, taxonomical differences, and bioassay results have been utilized in the discovery of new natural products to aid in Actinomycetes isolate-selection. However, no or less investigation have been done on establishing the differences in metabolomic profiles of the isolated microorganisms. The study aims to utilise bioassay- and metabolomics-guided tools that included dereplication study and multivariate analysis of the NMR and mass spectral data of microbial extracts to assist the selection of isolates for scaling-up the production of antimicrobial natural products. A total of 58 actinomycetes were isolated from different soil samples collected from Ihnasia City, Egypt and screened for their antimicrobial activities against indicator strains that included Bacillus subtilis, Escherichia coli, methicillin-resistant Staphylococcus aureus and Candida albicans. A number of 25 isolates were found to be active against B. subtilis and/or to at least one of the tested indicator strains. Principal component analyses showed chemical uniqueness for four outlying bioactive actinomycetes extracts. In addition, Orthogonal Projections to Latent Structures Discriminant Analysis (OPLS-DA) and dereplication study led us to further select two outlying anti-MRSA active isolates MS.REE.13 and 22 for scale-up work. MS.REE.13 and 22 exhibited zones of inhibition at 19 and 13 mm against MRSA, respectively. A metabolomics-guided approach provided the steer to target the bioactive metabolites (P<0.01) present in a crude extract or fraction even at nanogram levels but it was a challenge that such low-yielding bioactive natural products would be feasible to isolate. Validated to occur only on the active side of OPLS-DA loadings plot, the isolated compounds exhibited medium to weak antibiotic activity with MIC values between 250 and 800 μM. Two new compounds, P_24306 (C10H13N2) and N_12799 (C18H32O3) with MICs of 795 and 432 μM, were afforded from the scale-up of MS.REE. 13 and 22, respectively." @default.
• W2998202207 created "2020-01-10" @default.
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• W2998202207 creator A5091786663 @default.
• W2998202207 date "2019-12-30" @default.
• W2998202207 modified "2023-10-17" @default.
• W2998202207 title "Bioassay- and metabolomics-guided screening of bioactive soil actinomycetes from the ancient city of Ihnasia, Egypt" @default.
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• W2998202207 doi "https://doi.org/10.1371/journal.pone.0226959" @default.
• W2998202207 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6996811" @default.
• W2998202207 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32012209" @default.
• W2998202207 hasPublicationYear "2019" @default.
• W2998202207 type Work @default.
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