A new strain (deposit No. FERM BP-5736) of Bacillus sp., a protease highly stable in surfactants with the following properties obtained by cultivation of the strain or its mutants, its manufacturing method, and use of the protease. (1) hydrolyzes proteins or peptides, (2) the optimal pH of around 12 for incubation with casein as a substrate at 30°C for 24 hours, (3) the stable pH range of 5 to 11 for incubation with casein as a substrate at 30°C for 24 hours, (4) the optimal temperature of around 60°C for incubation with casein as a substrate at pH 10 for 10 minutes, (5) the molecular weight of 29,000±2,000 by SDS-polyacrylamide gel electrophoresis, (6) the isoelectric point of 10.1±0.5 by isoelectric focusing polyacrylamid gel electrophoresis, and (7) the residual activity of not less than 60% at 40°C at 30 minutes after mixing with a 500 ppm LAS solution and not less than 20% at 55°C after 15 minutes.
一种芽孢杆菌(Bacillus sp.)的新菌株(保藏号:FERM BP-5736),一种在表面活性剂中高度稳定的
蛋白酶,通过培养该菌株或其突变体、其制造方法和使用该
蛋白酶而获得以下特性。(1) 可
水解蛋白质或肽,(2) 以
酪蛋白为底物在 30°C 下培养 24 小时的最适 pH 值为 12 左右,(3) 以
酪蛋白为底物在 30°C 下培养 24 小时的稳定 pH 值范围为 5 至 11、(4) 以
酪蛋白为底物在 pH 值为 10 的条件下孵育 10 分钟的最佳温度为 60℃左右; (5) 经
SDS 聚
丙烯酰胺凝胶电泳测定的分子量为 29,000±2,000 ; (6) 等电点为 10.1±0.5 等电点聚
丙烯酰胺凝胶电泳;(7) 与 500ppm
LAS 溶液混合 30 分钟后,在 40°C 温度下残留活性不低于 60%,15 分钟后在 55°C 温度下残留活性不低于 20%。