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  • Title: [Antifungal and antiviral substances of Pseudomonas chlororaphis subsp. aureofaciens strains--components of gaupsin].
    Author: Kiprianova EA, Shepelevich VV, Klochko VV, Ostapchuk AN, Varbanets LD, Skokliuk LB, Berezkina AE, Avdeeva LV.
    Journal: Mikrobiol Z; 2013; 75(6):28-35. PubMed ID: 24450182.
    Abstract:
    Phenazine-1-carboxylic, 2-hydroxy-phenazine-carboxylic acid and 2-hydroxy-phenazine active against phytopathogenic fungi were detected in fermentation broth of Pseudomonas chlororaphis subsp.aureofaciens strains UCM B-111 and UCM B-306--components of insectofungicide biopreparation gaupsin using chromato-mass-spectrometric methods; strain B-306 produced antifungal antibiotic pyrrolnitrin together with phenazines. Supernatants of fermentation broth of P chlororaphis subsp. aureofaciens B-111 and B-306 strains grown in King A medium and exopolymers preparations obtained from these supernatants using evaporation, dialysis and liophylisation were highly active against tobacco mosaic virus (TMV). At a dose of 10 mg/ml they reduced TMV infectivity by 76-96%, at concentrations 1 and 0.1 mg/ml the antiviral effect was decreased to 40-62 and 14-27%, respectively. Dialysis did not influence the antiviral activity of isolated preparations. The latter contained 2-7.6 % of carbohydrates including neutral monosaccharides: fucose, mannose, galactose and glucose.
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