期刊
MICROORGANISMS
卷 9, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/microorganisms9061131
关键词
soil bacteria; Bacillus subtilis; antibiotics; MRSA; glycopeptides
类别
资金
- Alexander von Humboldt Foundation
- King Khalid University, Abha, KSA [R.G.P2/43/42]
Soil bacteria are important resources for antibiotic production and soil ecosystem maintenance. A novel antibiotic-producing bacterial strain was isolated from 55 tested soil samples, showing potential for developing new antibiotics to treat human pathogens.
Soil hosts myriads of living organisms with the extensive potential to produce bioactive compounds. Bacteria are the major soil inhabitants that represent a rich reservoir for antibiotic production along with their role in recycling nutrients and maintenance of the soil ecosystem. Here, from 55 tested soil samples, we isolated and identified a novel antibiotic-producing bacterial strain with a phylogenetically closest match to Bacillus subtilis sp. based on BLASTN search of GenBank for the 16S rRNA gene sequence. We characterized this novel strain through microscopic, biochemical, and molecular techniques, combined with testing its potential antimicrobial activity. Chemical studies revealed that the antibiotic produced by this strain is a glycopeptide. It exhibited profound activity against both methicillin-resistant Staphylococcus aureus (MRSA) and Candida albicans. The antibiotic is optimally produced at 37 degrees C after 28 h of growth. The biocompatibility of the extracted antibiotic was tested over a wide range of factors including temperature, pH, surfactants, and metal salts. To confirm its therapeutic potential, a sterile solution of the antibiotic was tested in vivo against bacteria-induced keratitis in rats where significant healing activity was recorded. Hence, this soil Bacillus strain may lead to the development of novel antibiotics for the treatment of human pathogens.
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