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http://dx.doi.org/10.5352/JLS.2009.19.7.994

Characterization and Purification of the Bacteriocin Produced by Bacillus licheniformis Isolated from Soybean Sauce  

Jung, Sung-Sub (Interdisciplinary Program in Biotechnology, Graduate School, Changwon National University)
Choi, Jung-I (Interdisciplinary Program in Biotechnology, Graduate School, Changwon National University)
Joo, Woo-Hong (Department of Biology, Changwon National University)
Suh, Hyun-Hyo (Department of Environmental Engineering, Jinju National University)
Na, Ae-Sil (Department of Biochemistry and Health Science, Changwon National University)
Cho, Yong-Kweon (Department of Biochemistry and Health Science, Changwon National University)
Moon, Ja-Young (Department of Biochemistry and Health Science, Changwon National University)
Ha, Kwon-Chul (Department of Biochemistry and Health Science, Changwon National University)
Paik, Do-Hyeon (Department of Biochemistry and Health Science, Changwon National University)
Kang, Dae-Ook (Department of Biochemistry and Health Science, Changwon National University)
Publication Information
Journal of Life Science / v.19, no.7, 2009 , pp. 994-1002 More about this Journal
Abstract
A bacteriocin-producing bacterium identified as Bacillus licheniformis was isolated from soybean sauce. Antibacterial activity was confirmed by paper disc diffusion method, using Micrococcus luteus as a test organism. The bacteriocin also showed antibacterial activities against Bacillus sphaericus, Lactobacillus bulgaricus, Lactobacillus planiarum, Paenibacillus polymyxa, and Pediococcus dextrinicus. Optimal culture conditions for the production of bacteriocin was attained by growing the cells in an MRS medium at a pH of 6.5~ 7.0 and a temperature of 37$^\circ$C for 36$\sim$48 hr. Solvents such as chloroform, ethanol, acetone, and acetonitrile had little effect on bacteriocin activity. However, about 50% of bacteriocin activity diminished with treatment of methanol and isopropanol at the final concentration of 50% at 25$^\circ$C for 1 hr. It was stable against a pH variation range from 3.0 and 7.0, but the activity reduced to 50% at a pH range from 9.0 to 11.0. It's activity was not affected by heat treatment at 100$^\circ$C for 30 min and 50% of activity was retained after heat treatment at 100$^\circ$C for 60 min, showing high thermostability. The bacteriocin was purified to a homogeneity through ammonium sulfate precipitation, SP-Sepharose ion-exchange chromatography, and reverse-phase high-performance liquid chromatography (HPLC). The entire purification protocol led to a 75-fold increase in specific activity and a 13.5% yield of bacteriocin activity. The molecular weight of purified bacteriocin was estimated to be about 2.5 kDa by tricine-SDS-PAGE.
Keywords
Bacteriocin; die diffusion method; antibacterial spectrum; purification; stability; soybean sauce;
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