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. 1984 Feb;157(2):627–631. doi: 10.1128/jb.157.2.627-631.1984

Purification and partial characterization of a Nocardia brasiliensis extracellular protease.

H Zlotnik, V L Schramm, H R Buckley
PMCID: PMC215292  PMID: 6363390

Abstract

Nocardia brasiliensis possess proteolytic activities that can be readily detected in a variety of media. In a modified formulation of a growth medium originally used for Streptomyces aureofaciens, N. brasiliensis was found to secrete proteolytic enzymes, one of which was capable of hydrolyzing casein. This enzyme was purified to homogeneity from cell-free culture filtrates of N. brasiliensis. The purification procedure included ion-exchange chromatography on carboxymethyl-Sepharose, gel filtration on Sephadex G-100, and affinity chromatography, using a hemoglobin-Sepharose resin. The molecular weight of the N. brasiliensis protease was found to be 25,000 by gel filtration and 35,000 by sodium dodecyl sulfate-discontinuous gel electrophoresis. The enzyme is inhibited by o-phenanthroline and 8-hydroxyquinoline-5-sulfonic acid but is not affected by EDTA. Average values for its kinetic parameters were 0.288 mumol of hemoglobin solubilized per min per mg of enzyme for Vmax and 0.76 mM for Km, using hemoglobin as the substrate.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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