Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Toxicity and Characteristics of Antifungal Substances Produced by Bacillus amyloliquefaciens IUB158-03

Bacillus amyloliquefaciens IUB158-03이 생산하는 항진균물질의 생화학적 특성 및 독성

  • Published : 2009.11.30
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Abstract

The purified antifungal substances produced by Bacillus amyloliquefaciens IUB158-03 was positive to ninhydrin but negative to aniline, suggesting that the antifungal substance could be a peptide. FAB-MS, UV adsorption spectrum, and amino acid composition analysis revealed that the molecular weight of the antifungal substance was 1042 and that maximal adsorption was at 220 nm and 277 nm. The antifungal substance was composed of $Asn_3$, $Gln_2$, $Ser_1$, $Gly_1$, and $Tyr_1$. The composition and structural characteristics of antifungal substance were analysed by $^1H$-NMR spectrum, $^1H$-COSY, HMQC, which revealed that the compound belongs to the iturin A family. Temperature and pH had little effect on the stability of the antifungal substance in the ranges of $-70{\sim}121^{\circ}C$ and pH 6.0~10.0, respectively. It showed strong antibiotic activity against fungi. An in vitro cytotoxicity test using NIH3T3 cell showed that the antifungal substance does not have cytotoxicity. The number of circulating leukocytes and the hematobiological analysis of the mice administered with the antifungal substances was similar to those of the control group, indicating no cytotoxicity in vivo. Therefore, the antifungal substances extracted from culture broth of Bacillus amyloliquefaciens IUB158-03 have future potential as biocontrol agents against plant diseases caused by fungi.

B. amyloliquefaciens IUB158-03균주에서 정제된 항진균물질은 극성인 용매에 잘 용해되고, pH 6.0~10.0와 $-70{\sim}121^{\circ}C$에서와 같이 넓은 범위의 온도 및 pH에서 안정성을 보였다. 항진균물질의 FAB-MS, UV 흡수 스펙트럼, 아미노산 조성 등을 분석한 결과 분자량은 1,042 이었고, TLC를 이용하여 분석한 결과 ninhydrin solution에서 보라색으로 발색되었다. UV 스펙트럼은 220 nm, 277 nm에서 ${\lambda}max$를 보였으며, $Asn_3$, $Gln_2$, $Ser_1$ $Gly_1$, $Tyr_1$의 아미노산 조성을 갖는 것으로 나타났다. 그리고 $^1H$-NMR spectrum, $^1H$-COSY, HMQC 을 분석한 결과 iturin A계에 속하는 물질로 확인되었다. NIH3T3 섬유아세포에 대해 항진균물질이 세포독성을 나타내지 않는 것은 물론 마우스에 항진균물질을 경구투여하여 장기 내의 변화와 백혈구 수, 생체내의 생리적인 기능면에서 정상 마우스와 차이를 보이지 않았으므로 생체독성이 없는 것으로 나타났다. 따라서 본 연구를 통하여 B. amyloliquefaciens IUB158-03에서 분리된 항진균물질이 앞으로 고추탄저병의 생물적 방제제로 이용될 수 있는 잠재성을 갖고 있는 것으로 사료된다.

Keywords

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