Alkaline protease, process for the production thereof, use thereof, and microorganism producing the same

摘要

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 DEG C for 24 hours, (3) the stable pH range of 5 to 11 for incubation with casein as a substrate at 30 DEG C for 24 hours, (4) the optimal temperature of around 60 DEG 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 DEG C at 30 minutes after mixing with a 500 ppm LAS solution and not less than 20% at 55 DEG C after 15 minutes.