Anti-methicillin Resistant Staphylococcus aureus Compound Isolation from Halophilic Bacillus amyloliquefaciens MHB1 and Determination of Its Mode of Action Using Electron Microscope and Flow Cytometry Analysis

The aim of this study was to purify, characterize and evaluate the antibacterial activity of bioactive compound against methicillin-resistant Staphylococcus aureus (MRSA). The anti-MRSA compound was produced by a halophilic bacterial strain designated as MHB1. The MHB1 strain exhibited 99 % similari...

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Veröffentlicht in:Indian journal of microbiology 2016-06, Vol.56 (2), p.148-157
Hauptverfasser: Jeyanthi, Venkadapathi, Velusamy, Palaniyandi
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Velusamy, Palaniyandi
description The aim of this study was to purify, characterize and evaluate the antibacterial activity of bioactive compound against methicillin-resistant Staphylococcus aureus (MRSA). The anti-MRSA compound was produced by a halophilic bacterial strain designated as MHB1. The MHB1 strain exhibited 99 % similarity to Bacillus amyloliquefaciens based on 16S rRNA gene analysis. The culture conditions of Bacillus amyloliquefaciens MHB1 were optimized using nutritional and environmental parameters for enhanced anti-MRSA compound production. The pure bioactive compound was isolated using silica gel column chromatography and Semi-preparative High-performance liquid chromatography (Semi-preparative HPLC). The Thin layer chromatography, Fourier transform infrared spectroscopy and proton NMR ( 1 H NMR) analysis indicated the phenolic nature of the compound. The molecular mass of the purified compound was 507 Da as revealed by Liquid chromatography-mass spectrometry (LC–MS) analysis. The compound inhibited the growth of MRSA with minimum inhibitory concentration (MIC) of 62.5 µg mL −1 . MRSA bacteria exposed to 4× MIC of the compound and the cell viability was determined using flow cytometric analysis. Scanning electron microscope and Transmission electron microscope analysis was used to determine the ultrastructural changes in bacteria. This is the first report on isolation of anti-MRSA compound from halophilic B. amyloliquefaciens MHB1 and could act as a promising biocontrol agent.
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MRSA bacteria exposed to 4× MIC of the compound and the cell viability was determined using flow cytometric analysis. Scanning electron microscope and Transmission electron microscope analysis was used to determine the ultrastructural changes in bacteria. 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MRSA bacteria exposed to 4× MIC of the compound and the cell viability was determined using flow cytometric analysis. Scanning electron microscope and Transmission electron microscope analysis was used to determine the ultrastructural changes in bacteria. 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MRSA bacteria exposed to 4× MIC of the compound and the cell viability was determined using flow cytometric analysis. Scanning electron microscope and Transmission electron microscope analysis was used to determine the ultrastructural changes in bacteria. This is the first report on isolation of anti-MRSA compound from halophilic B. amyloliquefaciens MHB1 and could act as a promising biocontrol agent.</abstract><cop>New Delhi</cop><pub>Springer India</pub><pmid>27570306</pmid><doi>10.1007/s12088-016-0566-8</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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identifier ISSN: 0046-8991
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issn 0046-8991
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Springer Nature - Complete Springer Journals; PubMed Central
subjects antibacterial properties
antibiotic resistance
Bacillus amyloliquefaciens
Bacteria
Bioactive compounds
Biological control
biological control agents
Biomedical and Life Sciences
cell viability
Chromatography
Electron microscopes
environmental factors
Flow cytometry
Fourier transform infrared spectroscopy
Fourier transforms
genes
growth retardation
high performance liquid chromatography
Infrared spectroscopy
Laboratories
Life Sciences
Liquid chromatography
Mass spectrometry
mechanism of action
Medical Microbiology
Metabolites
methicillin
Microbiology
minimum inhibitory concentration
Mode of action
molecular weight
nuclear magnetic resonance spectroscopy
Original
Original Article
Pathogens
Phenols
ribosomal RNA
Salinity
scanning electron microscopes
Silica
silica gel
Staphylococcus aureus
Staphylococcus infections
Thin layer chromatography
transmission electron microscopes
title Anti-methicillin Resistant Staphylococcus aureus Compound Isolation from Halophilic Bacillus amyloliquefaciens MHB1 and Determination of Its Mode of Action Using Electron Microscope and Flow Cytometry Analysis
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