Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Characterization and Production of Antibiotic by Bacillus subtilis 028-1, a Chungkookjang Fermenting Strain

청국장 발효 균주인 Bacillus subtilis 028-1의 항생물질 생산과 특성

  • 안경준 (서원대학교 과학교육과)
  • Received : 2009.03.12
  • Accepted : 2009.06.10
  • Published : 2009.06.30
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Abstract

Chungkookjang fermenting Bacillus subtilis 028-1 strain suppressed the growth of Staphylococcus sp. LS2, Saccharomyces cerevisiae, and Candida albicans. B. subtilis 028-1 strain produced antibiotic effectively in the medium of 2% soybean meal and 1% maltose as a disaccharide, when the shaking was continued 15~18 h and the pH of culture medium was maintained under 6.5. The antibiotic activity was optimized when the initial pH of the culture medium of test strain was adjusted with weak alkali, was remained after 20 min of boiling and for more than 1 month in room temperature, and was weakened slowly by the digestion of chymotrypsin and papain. The molecular weight of the antibiotic was identified between 500 and 1,000 dalton by dialysis, and antibiotic substance was considered as not surfactin but a member of iturin family because of the absence of fibrinolytic activity.

Bacillus subtilis 028-1 균주는 청국장 발효에 사용하는 균주로 Staphylococcus sp. LS2 뿐만 아니라 여러 yeast 균주의 생장을 억제하는 항생물질을 생산하며, soybean meal 2%와 maltose와 같은 이당류를 1% 첨가하여 15~18시간 진탕 배양하였을 때 최대의 항생물질 생산을 보였으며 배지의 pH는 6.5 이하였다. 항생물질의 활성은 약염기성 조건에서 극대화되었으며, $100^{\circ}C$에서 20분간 가열하여도 활성은 크게 감소하지 않았고, 실온 보관 시 한 달 이상 효과가 지속되며 chymotrypsin과 papain 같은 단백질 분해효소 처리에 의해 서서히 활성이 줄어들었다. 투석에 의해 항생물질의 분자량을 측정한 결과 1,000에서 500 dalton 사이인 것으로 나타났으며 항미생물 효과는 있으나 fibrin 분해 능력이 없으므로 surfactin이 아닌 iturin 계열의 peptide성 항생물질로 보인다.

Keywords

References

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