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Bacillus sp. strain DJ-4, which produces extracellular proteases, was screened from Doen-Jang, a traditional Korean fermented food. A fibrinolytic enzyme (subtilisin DJ-4) was purified using commercial chromatographic techniques. The relative molecular mass of the isolated protein was 29 kDa by SDS-PAGE and fibrin zymography assay. The enzyme was characterized as a serine protease by an inhibitor assay on the fibrin zymography gel and by an amidolytic assay using a chromogenic substrate. The enzyme was inhibited by PMSF, but not by EDTA or leupeptin. The first 14 amino acids of the N-terminal sequence were identical to that of subtilisin BPN', but the activity of subtilisin DJ-4 was 2.2 and 4.3 times higher than those of subtilisin BPN' and subtilisin Carlsberg, respectively.

Purification and Characterization of Subtilisin DJ-4 Secreted byBacillussp. Strain DJ-4 Screened fromDoen-Jang