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A protease was purified from Bacillus subtilis CCKS-111 by ammonium sulfate treatment, DEAE-cellulose ion-exchange chromatography, Sephadex G-100 gel filtration and high performance liquid chromatography (HPLC). The specific activity of the purified enzyme was 24.3 unit/㎎ protein and the purification fold of enzyme was 50.6. Molecular weight of the purified enzyme estimated about 28,000 by HPLC gel filtration. The amino acid residues of this enzyme were 251.3 except threonine, serine and glycine. This result was similar to Bacillus subtilis subtilisin DY. From the first N-terminal amino acid to the 32th amino acid, the amino acid sequence was estimated after RP-HPLC elution. N-terminal and the 32th amino acids were alanine and aspartic acid. Alanine, serine, glycine and arginine were four major acids in the enzyme.
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