A Halophilic Serine Proteinase from Halobacillus sp. SR5-3 Isolated from Fish Sauce : Purification and Characterization
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A halophilic bacterium was isolated from fish sauce, classified, and named <I>Halobacillus</I> sp. SR5-3. A purified 43-kDa proteinase produced by this bacterium showed optimal activity at 50 °C and pH 9–10 in 20% NaCl. The activity of the enzyme was enhanced about 2.5-fold by the addition of 20–35% NaCl, and the enzyme was highly stabilized by NaCl. It was found to be a serine proteinase related to either chymotrypsin or subtilisin. It absolutely preferred Ile at the P<SUB>2</SUB> position of substrates. Thus, the enzyme was found to be a halophilic serine proteinase with unique substrate specificity.
- Agricultural and Biological Chemistry
Agricultural and Biological Chemistry 70(6), 1395-1401, 2006-06-23
Japan Society for Bioscience, Biotechnology, and Agrochemistry