Arthrobacter simplex의 Steroid ${\Delta}^1$-dehydrogenase의 유도와 유도성 스테로이드의 성질

The Induction of Steroid ${\Delta}^1$-dehydrogenase from Arthrobacter simplex IAM 1660

Arthrobacter simplex IAM 1660의 스테로이드 $\Delta^1$-dehydrogenase에 대한 각종 steroid의 유도조건과 효과를 검토하였다. 그 결과 시험한 스테로이드 중 hydrocortisone이 가장 큰 효과를 나타냈고 progesterone, prednisolone, prednisone, androstenstendione의 순으로 유도효과를 보였고, 스테롤에 의해서는 유도효과가 낮았다. 유도 스테로이드의 특성으로는 스테로이드 모핵 C-3위가 수산기인 것보다 캐톤기이며 C-4위에 이중결합이 존재하고 스테로이드 D고리의 측쇄가 짧은 것이 유도 효과가 높았다.

- Since steroid $\Delta^1$-dehydrogenase synthesis has been known to be inducible, the mechanism of the enzyme induction of Arthrobacter simplex IAM 1660 was investigated. Among various steroids tested for inducers, hydrocortisone was the most effective inducer when hydrocortisone was used as a substrate for steroid $\Delta^1$-dehydrogenase. Steroid $\Delta^1$-dehydrogenase synthesis was effectively induced by progesterone, prednisolone and androstenedione, while the enzyme was less induced by cholesterol and not by phytosterols. The results suggest that the presence of 3-keto group and short side chain of steroids are the favorable factors for the induction of the $\Delta^1$-dehydrogenase synthesis. The enzyme was induced at the highest level when hydrocortisone was added at early log phase to the concentration of 0.01% of the culture and the culture was grown for 15 hours.