Mining Lactonase Gene from Aflatoxin B1-Degrading Strain Bacillus megaterium and Degrading Properties of the Recombinant Enzyme.
J Agric Food Chem
; 71(51): 20762-20771, 2023 Dec 27.
Article
em En
| MEDLINE
| ID: mdl-38103014
ABSTRACT
Mycotoxins are toxic secondary metabolites mainly produced by filamentous fungal species that commonly contaminate food and feed. Aflatoxin B1 (AFB1) is extremely toxic and seriously threatens the health of humans and animals. In this work, the Bacillus megaterium HNGD-A6 was obtained and showed a 94.66% removal ability of AFB1 by employing extracellular enzymes as the degrading active substance. The degradation products were P1 (AFD1, C16H14O5) and P2 (C14H16N2O2), and their toxicity was greatly reduced compared to that of AFB1. The AttM gene was mined by BlastP comparison and successfully expressed in Escherichia coli BL21. AttM could degrade 86.78% of AFB1 at pH 8.5 and 80 °C, as well as 81.32% of ochratoxin A and 67.82% of zearalenone. The ability of AttM to degrade a wide range of toxins and its resistance to high temperatures offer the possibility of its use in food or feed applications.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Bacillus megaterium
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Zearalenona
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Micotoxinas
Limite:
Animals
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Humans
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article