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  • Title: Purification and some properties of a protease from Streptomyces limosus.
    Author: Muro T, Watanabe Y, Sugihara A, Shimada Y, Nagao T, Takenishi S, Tominaga Y.
    Journal: Biosci Biotechnol Biochem; 1995 Mar; 59(3):474-8. PubMed ID: 7766186.
    Abstract:
    Streptomyces limosus was selected because it secreted a novel protease that catalyzed the synthetic reaction forming Pro-Pro-Pro from Pro-Pro. The protease was purified to an electrophoretically homogeneous state and an activity of more than about 20,000-fold that of the culture broth. The molecular mass of the enzyme was estimated to be 50 kDa by SDS-polyacrylamide gel electrophoresis. The enzyme was most active in alkaline pH for the synthetic reaction producing Pro-Pro-Pro from Pro-Pro, although for the hydrolytic reaction forming proline it was most active in neutral pH. The enzyme was inhibited by 1,2-epoxy-3-(p-nitrophenoxy)propane (EPNP) and diazoacetyl-DL-norleucine methyl ester (DAN). It can be considered that this enzyme belongs to the class of aspartic proteases. The substrate specificity indicates that this enzyme has a strong affinity for proline as a N-terminal amino acid of peptides.
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