한국미생물·생명공학회지 (Microbiology and Biotechnology Letters)

  • 제37권4호
  • /
  • Pages.340-349
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  • 2009
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  • 1598-642X(pISSN)
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  • 2234-7305(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
권호 표지

메주로부터 분리한 항진균 및 항세균 활성의 Bacillus polyfermenticus CJ9

Bacillus polyfermenticus CJ9, Isolated from Meju, Showing Antifungal and Antibacterial Activities

  • 발행 : 2009.12.28
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초록

메주로부터 항진균 및 항세균 활성을 나타내는 균주를 분리하고 동정하여 B. polyfermenticus CJ9로 명명하였다. B. polyfermenticus CJ9의 생육에 따른 항균 활성을 측정한 결과 항세균 활성은 배양 12시간에 최대 활성을 나타내며 72시간까지 90% 이상 활성을 유지하다 120시간에 활성을 완전히 상실하였다. 항진균 활성은 배양 24시간 이후부터 최대 활성을 나타내었고, 사멸기 이후 활성이 다소 감소되었으나 배양 120시간까지 활성이 유지되었다. B. polyfermenticus CJ9은 식품과 인체에 유해한 곰팡이, 효모, 그람 양성 및 음성 세균에 대한 항진균 활성과 항세균 활성을 동시에 나타내었다. B. polyfermenticus CJ9의 항세균 활성은 $37^{\circ}C$ 에서 24시간 열처리 후에 활성을 상실하였으며, pH 5.0~9.0 구간에서는 안정한 활성을 나타내었으나 pH 3.0~4.0 구간에서 활성이 감소하였다. 항진균 물질은 $121^{\circ}C$에서 15분간 열처리시 활성이 감소되었으나 역가가 완전히 소실되지 않았으며, pH 3.0~9.0 구간에서 안정한 활성을 나타내었다. 항세균 물질과 항진균 물질은 proteinase K, protease, trypsin, $\alpha$-chymotrypsin 등의 단백분해효소 처리로 역가를 상실하거나 일부 감소되어 단백질성 물질임을 추정하였다. B. polyfermenticus CJ9의 항세균 물질과 항진균 물질을 $C_{18}$ Sep-Pak column에 흡착된 분획으로부터 역가를 확인하여 소수성 물질임을 알 수 있었으며, Tricine-SDS-PAGE 및 direct detection 실험을 통하여 분자량을 확인한 결과 항진균 물질은 약 1.4 kDa의 물질임을 확인하였다. 그러나 항세균 활성 물질은 열 불안정성 때문에 동 실험법상에서 그 분자량을 확인할 수 없었다. B. polyfermenticus CJ9이 생산하는 항균 물질은 항세균 및 항진균 활성을 동시에 가지는 단백질성 물질로서 천연 식품보존제 및 정장제재로 활용이 기대되며, 이를 위하여 항세균 물질과 항진균 물질의 정제 및 구조분석 등의 연구가 필요하다.

A CJ9 bacterial strain, which showed antifungal and antibacterial activities, was isolated from meju and identified as Bacillus polyfermenticus based on Gram staining, biochemical properties, as well as its 16S rRNA sequence. B. polyfermenticus CJ9 showed the antimicrobial activity against the various pathogenic molds, yeasts, and bacteria. The antibacterial activity was stable in the pH 5.0~9.0, but the activity was lost at $37^{\circ}C$ for 24 hr. The antifungal activity was stable in the pH range of 3.0~9.0 and reduced at $121^{\circ}C$ for 15 min, but antifungal activity was not completely destroyed. The antibacterial activity was completely inactivated by proteinase K, protease, trypsin, and $\alpha$-chymotrypsin. The antifungal activity was also completely inactivated by protease and $\alpha$-chymotrypsin, and reduced its activity by proteinase which indicated that the antifungal and antibacterial compounds have proteineous nature. The apparent molecular mass of the partially purified antifungal compound, as indicated by using the direct detection method in Tricine-SDS-PAGE, was approximately 1.4 kDa. The molecular mass of the antibacterial compound could not be determined because of its heat-liable characteristic.

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