Journal of Microbiology and Biotechnology
The Korean Society for Microbiology and Biotechnology publishes the Journal of Microbiology and Biotechnology.

2020 ; Vol.30-1: 93~100

AuthorHo Sun Sung, Youl Lae Jo
Place of dutyDepartment of Applied Microbiology and Biotechnology, Yeungnam University, Gyeongsan 38541, Republic of Korea
TitlePurification and Characterization of an Antibacterial Substance from Aerococcus urinaeequi Strain HS36
PublicationInfo J. Microbiol. Biotechnol.2020 ; Vol.30-1
AbstractA bacterial strain inhibiting the growth of Vibrio anguillarum, the causative agent of vibriosis, was isolated from fish intestines. The isolated strain HS36 was identified as Aerococcus urinaeequi based on the characteristics of the genus according to Bergey’s Manual of Systematic Bacteriology and by 16S rRNA sequencing. The growth rate and antibacterial activity of strain HS36 in shaking culture were higher than those in static culture, while the optimal pH and temperature for antibacterial activity were 7.0 and 30°C, respectively. The active antibacterial substance was purified from a culture broth of A. urinaeequi HS36 by Sephadex G-75 gel chromatography, Sephadex G-25 gel chromatography, and reverse-phase high-performance liquid chromatography. Its molecular weight, as estimated by Tricine SDS-polyacrylamide gel electrophoresis, was approximately 1,000 Da. The antibacterial substance produced by strain HS36 was stable after incubation for 1 h at 100°C. Although its antibacterial activity was optimal at pH 6-8, activity was retained at a pH range from 2 to 11. The purified antibacterial substance was inactivated by proteinase K, papain, and β-amylase treatment. The newly purified antibacterial substance, classified as a class II bacteriocin, inhibited the growth of Klebsiella pneumoniae, Salmonella enterica, and Vibrio alginolyticus.
Full-Text
Key_wordAerococcus urinaeequi, antibacterial substance, aquaculture, bacteriocin, Vibrio (Listonella) anguillarum
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