Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Characterization of Enzymes Against Oxygen Derivatives Produced by Rhodobacter sphaeroides D-230

Rhodobacter sphaeroides D230이 생성하는 산소 유도체에 작용하는 효소의 특성

  • 김동식 (동아대학교 자연과학대학 화학 생명과학부 생명과학전공) ;
  • 이혜주 (동아대학교 자연과학대학 화학 생명과학부 생명과학전공)
  • Published : 2004.06.01
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Abstract

The activities of enzymes that act on oxygen derivatives in Rhodobacter sphaeroides D-230 were investigated under various culture conditions. Intracellular SOD activity from the cells grown in aerobic or anaerobic culture conditions was highest at pH 7.0 and pH 8.0, respectively. On the other hand, extracellular SOD activity was highest at pH 6.0. Catalase activity was highest at neutral pH in both cases. Growth of R. sphaeroides D-230 in aerobic or anaerobic culture conditions was inhibited by methyl viologen. As R. sphaeroides D-230 was cul-tured aerobically, SOD activity was increased about 2-fold by addition of iron ion. But $Mn^+2$ had little effect on the SOD activity of R. sphaeroides D-230 grown in aerobically. NaCN, the inhibitor of Cu$.$Zn-SOD, did not inhibit SOD activity. But, $NaN_3$, the inhibitor of Mn-SOD, inhibited SOD activity in anaerobic cultures con-dition. Therefore, R. sphaeroides D-230 produce Mn-SOD in anaerobic condition, although Fe-Sod is produced in aerobic condition. The activity of catalase was induced by methyl viologen, however, extremely inhibited by NaCN and $NaN_3$.

산소의 존재 유ㆍ무 등과 같은 배양 환경의 변화에 따라 통성 혐기성 광합성 세균인 Rhodobacter sphaerodes B-230이 만들어내는 산소 유도체에 작용하는 효소의 특성을 조사한 결과 세포내 SOD는 호기적 배양에서는 초기 배양액의 pH가 7일 때, 혐기적 배양에서는pH 8일 때 활성이 높은 반면 세포외 방출 SOD는 두 배양조건에서 모두 약산성인 pH 6에서 활성이 높았다. Catalase는 두 조건 모두 중성 부근에서 최고의 활성을 보였으며, 산성 pH 부위에서는 급격히 활성이 낮아졌다. Mn-SOD의 활성 유도제인 methyl viologen을 첨가했을 때 두 조건 모두에서 성장의 저해를 보였으며, 배지에 철 이온을 첨가하여 배양 하였을 때 호기적 조건에서만 두 배 이상 활성이 증가되었다. 혐기적 조건에서는 전체적인 활성이 낮아 금속이온의 추가적인 첨가에도 더 이상 활성이 유도되지 않았다. Mn-SOD 활성 저해제인 $NaN_3$와 CuZn-SOD활성 저해제인 NaCN를 배양액에 첨가했을 때 NaCN은 두 가지 배양 조건에서 생성되는 SOD 모두를 저해하지 않았으며, $NaN_3$는 혐기적 배양조건에서만 0.3 mM 이상에서 급격한 SOD활성의 저해를 가져왔다. 따라서 Rhodobacter sphaeroides D-230도 혐기적 배양 조건에서 Mn-SOD가 생성되는 것을 확인할 수 있었으며,호기적 조건에서는 Fe-SOD가 생성되는 것을 확인할 수 있었다. Catalase의 활성도 두 가지 배양조건 모두에서 methy1 viologen에 의해 활성이 유도되었으며, NaCN와 $NaN_3$에 의해서 급격히 저해되었다.

Keywords

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