Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 11, Issue 10, Pages 4063-4079Publisher
MDPI
DOI: 10.3390/ijms11104063
Keywords
aflatoxin B-1; biotransformation; culture supernatant; Myxococcus fulvus ANSM068
Funding
- National Natural Science Foundation of China [30571353]
- National Key Lab for Animal Nutrition
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Aflatoxin B-1 (AFB(1)) is commonly found in cereals and animal feeds and causes a significant threat to the food industry and animal production. Several microbial isolates with high AFB(1) transformation ability have been identified in our previous studies. The aim of this research was to characterize one of those isolates, Myxococcus fulvus ANSM068, and to explore its biotransformation mechanism. The bacterial isolate of M. fulvus ANSM068, isolated from deer feces, was able to transform AFB(1) by 80.7% in liquid VY/2 medium after incubation at 30 degrees C for 72 h. The supernatant of the bacterial culture was more effective in transforming AFB(1) as compared to the cells alone and the cell extract. The transformation activity was significantly reduced and eradicated after the culture supernatant was treated with proteinase K, proteinase K plus SDS and heating. Culture conditions, including nitrogen source, initial pH and incubation temperature were evaluated for an optimal AFB(1) transformation. Liquid chromatography mass spectrometry (LCMS) analyses showed that AFB(1) was transformed to a structurally different compound. Infrared analysis (IR) indicated that the lactone ring on the AFB(1) molecule was modified by the culture supernatant. Chromatographies on DEAE-Ion exchange and Sephadex-Molecular sieve and SDS-PAGE electrophoresis were used to determine active components from the culture supernatant, indicating that enzyme(s) were responsible for the AFB(1) biotransformation. This is the first report on AFB(1) transformation by a strain of myxobacteria through enzymatic reaction(s).
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