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Isolation, purification and characterization of a pyocin
Abstract:
Seventeen strains of P. aeruginosa were tested for pyocin production using the broth method. Mitomycin C was used for the induction of pyocin in TSB shaked cultures incubated at 32 degrees. The highest pyocin activity was produced by strain 14. TSB shaked cultures in fluting flasks were found to be superior to Erlenmeyer flasks for pyocin production. Pyocin 14 was purified by chemical and chromatographic methods. It was found to be protein in nature and free from carbohydrates. It is stable between pH 5 and 9 and is partially inactivated when kept for one month at 4 degrees. Freezing and thawing, lyophilization and heating at 65 degrees for 5 min completely destroyed its activity. The addition of 4 mg/ml bovine albumin or 2 mg/ml gelatin caused about 60% increase in activity. However, treatment with 10 mM EDTA caused a 98% drop in its activity.
Insights
Researchers optimized pyocin production from Pseudomonas aeruginosa, identifying strain 14 as the highest producer. Optimal conditions included specific flasks and media, with the purified pyocin showing protein nature and specific stability characteristics.
Area of Science:
- Microbiology
- Bacteriology
Background:
- Pseudomonas aeruginosa produces pyocins, which are bacteriocins with bactericidal activity.
- Understanding pyocin production and characteristics is crucial for potential therapeutic applications.
Purpose of the Study:
- To investigate pyocin production in different strains of Pseudomonas aeruginosa.
- To optimize conditions for pyocin production and characterize purified pyocin.
Main Methods:
- Seventeen strains of P. aeruginosa were screened for pyocin production using a broth method.
- Mitomycin C was used for pyocin induction in Tryptic Soy Broth (TSB) cultures.
- Pyocin 14 was purified using chemical and chromatographic techniques.
Main Results:
- Strain 14 exhibited the highest pyocin activity.
- Fluting flasks yielded superior pyocin production compared to Erlenmeyer flasks.
- Purified Pyocin 14 was identified as proteinaceous, stable between pH 5-9, and sensitive to heat, freezing, and EDTA.
Conclusions:
- Pyocin production can be enhanced through optimized culture conditions and strain selection.
- Pyocin 14 demonstrates specific biochemical properties and stability limitations.
- Further research into pyocin stabilization and application is warranted.