A total of 18 protease producing bacterial strains were isolated from detergent effluent in South Korea
using skim milk agar medium. A strain (BK-P21A) was selected and identified as Bacillus koreensis based
on morphological, biochemical and molecular characterizations (16S rRNA gene sequence analysis). Optimized
culture conditions for the production of protease were pH 8.5, 30 ◦C, sucrose (2%) and yeast extract
(0.2%) during 36 h of incubation. Furthermore, the protease was partially purified by ammonium sulphate
precipitation (80%) and again by Superdex 200 10/300 GL and Superdex 75 10/300 GL column chromatography,
which resulted in 5.0 fold purification and a yield of 23%. The molecular mass of the protease was
estimated to be 48 kDa by SDS-PAGE. The purified enzyme was further characterized and found to be most
active at pH 9.0 and 60 ◦C. The activity of the purified protease was enhanced by CaCl2 and CoCl2, but
inhibited by PMSF, which indicated it was a serine type protease. Moreover, the protease was moderately
stable in surfactants and 81% stable in H2O2. Finally, the enzyme was more active and stable (94–126.5%)
in various hydrophilic organic solvents. Considering the stability of protease towards the alkaline pH,
high temperature and organic solvents (50%), the enzyme from B. koreensis can be used as an alternative
biocatalyst for several industrial applications mainly for peptide synthesis in nonaqueous solvents.