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• W1885202317 abstract "An alkalophilic Bacillus sp., strain GX6638 (ATCC 53278), was isolated from soil and shown to produce a minimum of three alkaline proteases. The proteases were purified by ion-exchange chromatography and were distinguishable by their isoelectric point, molecular weight, and electrophoretic mobility. Two of the proteases, AS and HS, which exhibited the greatest alkaline and thermal stability, were characterized further. Protease HS had an apparent molecular weight of 36,000 and an isoelectric point of approximately 4.2, whereas protease AS had a molecular weight of 27,500 and an isoelectric point of 5.2. Both enzymes had optimal proteolytic activities over a broad pH range (pH 8 to 12) and exhibited temperature optima of 65 degrees C. Proteases HS and AS were further distinguished by their proteolytic activities, esterolytic activities, sensitivity to inhibitors, and their alkaline and thermal stability properties. Protease AS was extremely alkali stable, retaining 88% of initial activity at pH 12 over a 24-h incubation period at 25 degrees C; protease HS exhibited similar alkaline stability properties to pH 11. In addition, protease HS had exceptional thermal stability properties. At pH 9.5 (0.1 M CAPS buffer, 5 mM EDTA), the enzyme had a half-life of more than 200 min at 50 degrees C and 25 min at 60 degrees C. At pH above 9.5, protease HS readily lost enzymatic activity even in the presence of exogenously supplied Ca2+. In contrast, protease AS was more stable at pH above 9.5, and Ca2+ addition extended the half-life of the enzyme 10-fold at 60 degrees C. In contrast, protease AS was more stable at pH above 9.5, and Ca2+ addition extended the half-life of the enzyme 10-fold at 60 degrees C. The data presented here clearly indicate that these two alkaline proteases from Bacillus sp. strain GX6638 represent novel proteases that differ fundamentally from the proteases previously described for members of the genus Bacillus." @default.
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• W1885202317 date "1987-06-01" @default.
• W1885202317 modified "2023-10-18" @default.
• W1885202317 title "Novel alkaline- and heat-stable serine proteases from alkalophilic Bacillus sp. strain GX6638" @default.
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• W1885202317 doi "https://doi.org/10.1128/jb.169.6.2762-2768.1987" @default.
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