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Microbiology and Biotechnology Letters

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Bioactive Compounds / Food Microbiology  |  Bioactive compounds and Physiological properties

Microbiol. Biotechnol. Lett. 2018; 46(1): 40-44

https://doi.org/10.4014/mbl.1712.12004

Received: December 11, 2017; Accepted: February 17, 2018

Pseudomonas otitidis PS 균주의 항생물질 생산과 작용 기작

Antibiotic Production of Pseudomonas otitidis PS and Mode of Action

Kyung-Joon Ahn *

Department of Biology Education, Seowon University, Cheongju 28674, Republic of Korea

An isolate capable of inhibiting the growth of gram-positive bacteria was obtained from the soil of Mushim stream, Cheongju. The isolate was identified as Pseudomonas otitidis PS by 16S rRNA gene sequence analysis. P. otitidis PS produced antibiotics as a secondary metabolite when cultured in 1% soybean meal with 0.5% glucose. The maximum yield was about 0.1%. The antibiotic substance of P. otitidis PS extracted using ethyl acetate displayed a minimum inhibitory concentration of 2 μg/ml for Staphylococcus aureus KCTC 1261. The antibiotic substance produced an orange halo on chrome azurol S agar due to siderophore activity. Growth inhibition was decreased when the iron was depleted. Since the antibiotic activity was lost upon the addition of the reducing agent ascorbic acid or during anaerobic culture, it was considered that antibiotic of P. otitidis PS strain exerts its bactericidal effect by the generation of reactive oxygen species.

Keywords: Pseudomonas otitidis, antibiotic, bactericidal activity, siderophore

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