A protease secreted in Bacillus pumilus KMM 62 culture liquid on different growth stages was isolated using ion-exchange chromatography. On the basis of pattern of specific chromogenic substrates hydrolysis and inhibitory analysis the protease was classified as subtilisin like serine protease. The molecular weight ofprotease is 31 kDa. Proteolytic activity towards Z-Ala-Ala-Leu-pNa substrate was maximal at pH 8-8.5. The optimal temperature for proteolytic activity was observed at a temperature of 30 degrees C, and the protein was stable within the pH range of 7.5-10.0. Bacillus pumilus KMM 62 subtilisin like serine protease was shown to have thrombolytic activity.
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