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Inactivation of virginiamycin by Aureobasidium pullulans
Timothy D Leathers1, Joseph O Rich2, Melinda S Nunnally2
1Renewable Product Technology Research Unit, Agricultural Research Service, US Department of Agriculture, National Center for Agricultural Utilization Research, 1815 North University Street, Peoria, IL, 61604, USA. Tim.Leathers@ars.usda.gov.
Objective:
To test the inactivation of the antibiotic, virginiamycin, by laccase-induced culture supernatants of Aureobasidium pullulans.
Results:
Fourteen strains of A. pullulans from phylogenetic clade 7 were tested for laccase production. Three laccase-producing strains from this group and three previously identified strains from clade 5 were compared for inactivation of virginiamycin. Laccase-induced culture supernatants from clade 7 strains were more effective at inactivation of virginiamycin, particularly at 50 °C. Clade 7 strain NRRL Y-2567 inactivated 6 µg virginiamycin/ml within 24 h. HPLC analyses indicated that virginiamycin was degraded by A. pullulans.
Conclusions:
A. pullulans has the potential for the bioremediation of virginiamycin-contaminated materials, such as distiller's dry grains with solubles (DDGS) animal feed produced from corn-based fuel ethanol production.