Abstract
A strain of Pseudomonas aeruginosa has been shown to produce an enzyme that lyses viable cells of Staphylococcus aureus. The maximal yield of the enzyme was obtained from shake flask cultures of P. aeruginosa which were grown for 18 to 22 hr at 37 C in Trypticase Soy Broth. A 333-fold purification of the enzyme was obtained by acetone precipitation of the culture liquor, followed by column chromatography on phosphonic acid cellulose and Bio-Gel P2. The staphylolytic enzyme exhibited maximal activity at 37 C in 0.01 m sodium phosphate (pH 8.5) and was stable at 37 C in the pH range of 7.5 to 9.5. The inhibition and stabilization of the enzyme by various organic and inorganic materials was investigated. Spheroplasts of S. aureus were formed by treating viable cells with the staphylolytic enzyme in 1 m sucrose or human serum.
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