Studies on Cysteinedesulfhydrase produced by Bacteria.(Part 1) Isolation and Identification of Cysteinedesulfhydrase producing Bacterium.

Bacteria가 생산하는 Cysteinedesulfhydrase에 관한 연구(제일보) Cysteinedesulfhydrase 생산균의 분리검색 및 동정

1. In the course of investigation on the metabolism of cysteine by microorganisms, the authors have found that among 70 strains tested Cysteinedesulfhydrase occured most remarkably in the cells of the strain I-3-2 isolated from the soil when it was grown on a medium containing L-Cysteine. The morphological, cultural and physiological properties of this strain were investigated. From the results, the bacterium was identified as a variety of Aerobactor aerogenes. 2. The cultural conditions for the formation of Cysteinedesulfhydrase by the strain I-3-2 were also investigated and the results were as follows: 1). The optium pH of the culture medium was 7.0-7.5. 2). As a carbon source, glycerol was most effective when it was added to the basal medium at 0.1 ％ concentration. 3). By addition of calcium chloride at 0.2％ concentration, the formation of the enzyme remarkably increased. 4). Maximal formation of the enzyme was observed at the end of logarithmic phase of cell growth, thereafter the enzyme activity was diminished rapidly.

1. 약 70여종의 보존 및 토양분리균에서 cysteine 분해능이 큰 새로운 균주를 분리검색 하였던 바 cysteine 분해능이 가장 높았던 토양분리균주인 No. I-3-2를 공시균주로 선정하여 이균주에 대한 균학적 제성질을 검토한 결과 No, I-3-2 균주는 Aerobacter aerogenes로 동정되었다. 2. No I-3-2 균주는 L-cysteine을 cysteinedesulfhydrase 생산의 가장 효과적인 유도제로 필요로 하였으며 또한 본균의 효소생산을 위한 몇가지 배양조건을 검토한 결과 배양배지의 initial PH가 7.0~7.5일때, 탄소원으로 glycerol을 0.1%, 무기염으로 CaCl$_2$를 0.2% 농도로 기초배지에 첨가 하였을때 가장 양호한 효소생산효과를 나타내었고 배양시간은 배양 8시간전후에서 균체증식 및 효소생산의 최대치를 나타내었다.