Abstract
Screening was carried out to obtain microorganisms which produced the enzyme to reduce the disulfide bond, from our type cultures of yeast. Among many strains of yeast showing activity to reduce the disulfide bond, Candida claussenii, Candida brumptii and Candida rugosa were selected to have the highest activity. The enzyme activity was detected in the cell free extracts, but not in culture broth.The highest enzyme formation occured during the exponential growth phase, and rapid decrease of activity was observed in the stationary phase. Pantothenate and boron ion contributed to enzyme formation, and biotin and zinc ion to growth. The maximum enzyme activity was obtained in the following synthetic medium: 10% sucrose, 0.3% (NH4)2SO4, 0.5% KH2PO4, 0.15% MgCl2·6HO2 0.05% CaCl2, 0.015% MnCl2, 0.001% pantothenate, 0.0001% biotin, 0.0001% H3BO3, 0.00004% FeCl3·6H2O and 0.00008% ZnCl2. In addition, 30°C of the cultural temperature and vigorous aeration showed good results for enzyme formation.
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