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http://dx.doi.org/10.5352/JLS.2017.27.7.805

Characteristics of Hydrolytic Enzymes that Produced by Bacillus subtilis CK-2 Isolated from Doenjang  

Lee, Sang-Hyup (Dept. of Pharmaceutical Engineering, Gyeongnam National University of Science and Technology)
Kim, Chul-Ho (Dept. of Pharmaceutical Engineering, Gyeongnam National University of Science and Technology)
Publication Information
Journal of Life Science / v.27, no.7, 2017 , pp. 805-811 More about this Journal
Abstract
In the previous paper, we isolated a bacterium that can hydrolyze various organic materials from soybean paste, including cellulose, lipids, starch, and protein. The activity and chemical properties of the crude enzymes produced by the isolate Bacillus subtilis CK-2 were further investigated. Cellulase showed the highest activity at pH 5.0 and $55^{\circ}C$. The stability of cellulase was maintained within the ranges of pH 5.0~10.0 and $20{\sim}50^{\circ}C$. Cellulolytic enzymes were activated by a $Co^{2+}$ ion, demonstrating the highest activity at a 0.45%(w/v) concentration of $Co^{2+}$. The optimal conditions for amylase were pH 5.0 and $50^{\circ}C$. The activity of amylase was stable within the ranges of pH 4.0~5.0 and $20{\sim}50^{\circ}C$. The $Co^{2+}$ ion was also necessary for amylase activity, which was the highest at a 0.2%(w/v) concentration of $Co^{2+}$. The optimal pH and temperature conditions of protease were pH 8.0 and $50^{\circ}C$. The activity of protease was stable within the ranges of pH 7.0~8.5 and $20{\sim}50^{\circ}C$. Protease activity was catalyzed by $Mn^{2+}$, which was the highest at a 0.125%(w/v) concentration of $Mn^{2+}$. The isolate B. subtilis CK-2 demonstrated a high activity of autolysin. Based on these results, we identified and suggested the optimal pH, temperature, and metal ion concentration in the use of the hydrolytic enzymes of B. subtilis CK-2 for industrial purposes.
Keywords
Amylase; Bacillus subtilis; cellulase; optimal condition; protease;
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