KSBB Journal

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Production and Characterization of Cholesterol Oxidase from Streptomyces sp. No.4

방선균으로부터 Cholesterol Oxidase의 생산 및 특성

  • 김현수 (계명대학교 자연과학대학 미생물학과) ;
  • 고희선 (계명대학교 자연과학대학 미생물학과)
  • Published : 1999.04.01
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Abstract

An actinomycetes strain No.4 which produce the cholesterol oxidase(EC 1.1.3.6), was isolated from soil and identified as Streptomyces sp. based on taxonomic studies. The conditions of cholesterol oxidase production and enzymatic properties were investigated. The optimum composition of medium for production of the enzyme was 1% soluble starch, 2% corn steep liquor, 0.1% $KH_2PO_4$, 0.1% $NaNO_3$ and 0.05% $MgSO_4$ (pH 7.0). The optimum pH and temperature of the cholesterol oxidase were pH 6.0~7.5 and $37^{\circ}C$, respectively. The enzyme was stable in the range of pH 6.0~9.0. The isoelectric point determined by multichambered electrofocusing unit was in the range of pH 6.0~6.5.

Cholesterol oxidase(EC.1.1.3.6)는 cholesterol을 산화 또는 이성화시키는 효소로, 혈중 cholesterol이 측정 등의 임상진단용 시약에 이용되고 있으며, 여려종류의 미생물에서 분리, 연구되어 왔다. 현재에는 농업 및 식품 등에도 응용이 기대되고 있는 매우 유용한 효소이다. 본 실힘은 토양에서 분리한 방선균으로부터 cho1esterol oxidase생산능이 우수한 균주를 선발하여 속의 동정, 효소의 생산조건 및 효소학적 특성을 조사하였다 . 본 분리균주는 배양학적, 형태학적 생리학적 특성 및 현미경 검정을 통하여 Streptomyces sp으로 동정하였다. 본 효소의 생산조건을 조사한 결괴 탄소원으로 1% soluble starch, 질소원으로 2% corn steep liquor가 효소생산에 우수하였으며, 이들 탄소원, 질소원이의 0.1% $NaNO_3$, 0.1% $KH_2PO_4$, 0.05% $MgSO_4$가 함유된 배지를 생산 최적 배지로 사용하였다. 본 효소의 특성을 검토한 결과, 최적온도와 최적pH는 각각 $37^{\circ}C$, pH 6.5~7.5이었으며. 효소와 안정성은 온도 $30-40^{\circ}C$에사 80% 이상 활성이 유지되었으며, pH 6.0~9.0의 범위까지 안정한 것으로 나타났다. 본 효소의 등전점은 multichambered electrofocusing unit를 사용하여 측정한 결과 pH 6.0-6.5인 것으로 추정되었다.

Keywords

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