Mycotoxin Biodegradation Ability of the Cupriavidus Genus

Area of Science:

• Microbiology
• Environmental Science
• Biotechnology

Background:

• Mycotoxins pose significant risks to human and animal health.
• Biological methods offer a promising approach for mycotoxin detoxification.
• The Cupriavidus genus exhibits heavy metal resistance and inhabits diverse environments.

Purpose of the Study:

• To investigate the biodegradation and biodetoxification capabilities of Cupriavidus strains against five major mycotoxins.
• To identify specific Cupriavidus strains effective in degrading aflatoxin B1 (AFB1), ochratoxin-A (OTA), zearalenone (ZON), T-2 toxin (T-2), and deoxynivalenol (DON).

Main Methods:

• Screening of 16 Cupriavidus type strains for mycotoxin degradation.
• Utilizing biotests: SOS-chromotest for AFB1 genotoxicity, BLYES test for ZON oestrogenicity, and zebrafish embryo microinjection for OTA and T-2 teratogenicity.
• Quantifying biodetoxification effects of promising strains.

Main Results:

• Seven strains degraded OTA, four degraded AFB1, four degraded ZON, and three degraded T-2.
• No strains demonstrated the ability to degrade DON.
• Specific strains showed efficacy in reducing AFB1 genotoxicity (C. laharis, C. oxalaticus) and ZON oestrogenicity (C. basilensis).
• C. numazuensis DSM 15562T uniquely degraded four mycotoxins (AFB1, ZON, OTA, T-2).

Conclusions:

• The Cupriavidus genus possesses significant potential for mycotoxin biodegradation, with notable strain-specific activities.
• Certain strains exhibit a broad spectrum of mycotoxin degradation, offering unique bioremediation capabilities.
• The inability of tested strains to degrade DON indicates a gap in current microbial detoxification strategies for this mycotoxin.