Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Antifungal Activity of Bacillus polyfermenticus CJ6 Isolated from Meju

메주로부터 분리한 Bacillus polyfermenticus CJ6의 항진균 활성

  • Published : 2009.04.30
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Abstract

The CJ6 bacterial strain, which possesses strong antifungal activity, was isolated from meju and identified as Bacillus polyfermenticus based on Gram staining, biochemical properties, and 16S rRNA gene sequencing. B. polyfermenticus CJ6 showed antimicrobial activity against the various pathogenic molds, yeasts, and bacteria. Antifungal activity from B. polyfermenticus CJ6 was reduced after 24 hr at $70^{\circ}C$ but antifungal activity was not completely destroyed. The antifungal activity was stable in the pH range of $3.0{\sim}9.0$, and inactivated by proteinase K, protease, and ${\alpha}$-chymotrypsin, which indicate its proteinaceous nature. The apparent molecular masses of the partially purified antifungal compound, as indicated by using the direct detection method in Tricine-SDS-PAGE, was approximately 1.4 kDa.

메주로부터 곰팡이 및 세균 등에 생육 저해활성을 나타내는 균주 B. polyfermenticus CJ6을 분리 동정하였다. 분리 균주 B. polyfermenticus CJ6는 2단 대수기를 나타내는 생육 곡선상 특이점을 나타내었으며 배양 30시간 이후부터 최대 활성을 나타내었고 사멸기 이후 활성이 다소 감소되었으나 120시간까지 활성을 유지하였다. B. polyfermenticus CJ6의 항진균 활성 물질은 $70^{\circ}C$ 이상에서 활성이 감소되었으나 $121^{\circ}C$에서 15분간 열처리 시 역가가 완전히 소실되지 않았다. pH 안정성 실험에서는 pH $3.0{\sim}9.0$ 구간에서 안정한 활성을 나타내었으며, 각종 효소에 대한 영향에서 항진균 활성물질은 proteinase K, protease, ${\alpha}$-chymotrypsin 등의 단백분해효소 처리로 역가를 상실하거나 일부 감소되어 단백질성 물질임을 추정하였다. 균주의 항진균 활성 물질을 $C_{18}$ Sep-Pak column으로 부분 정제한 후 Tricine-SDS-PAGE 및 direct detection 실험을 통하여 분자량이 약 1.4 kDa의 물질임을 확인하였다. B. polyfermenticus CJ6가 생산하는 항진균 활성 물질은 기존에 거의 보고되지 않은 B. polyfermenticus 유래의 단백질성 항진균 활성 물질로서 천연보존제 및 천연항균제재로 사용이 기대되며, 이를 위하여 항진균 활성 물질들의 정제 및 구조분석 등의 연구가 필요하다.

Keywords

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