Concurrent biodegradation of tylosin and tilmicosin by a novel Paracoccus versutus 4-B-2.
Chen Z, Liu A, Cui J, Liu C, Li H
Bioremediation
Antibiotic residues from livestock farms routinely wash into the irrigation water and soil used to grow your food, silently breeding drug-resistant bacteria that end up on your plate and in your garden bed — this bacterium could intercept that contamination at the source.
Researchers found a naturally occurring bacterium that can eat two different livestock antibiotics at the same time, completely destroying them within about six days. It works by producing a special enzyme that breaks open the circular chemical structure these antibiotics rely on, which also makes the breakdown products far less harmful. The bacterium even kept working when tested in real sewage, suggesting it could one day be used to clean up contaminated farm runoff before it reaches rivers, fields, and drinking water.
Key Findings
The bacterium fully degrades both antibiotics within 144 hours, with half-lives of 1.28 days (tilmicosin) and 1.47 days (tylosin) — a 1.6-fold improvement over previously reported strains.
A novel enzyme (Est-4151) drives degradation by cleaving the macrolide lactone ring and reduces the antibacterial activity of breakdown products by more than 20%.
The strain tolerates antibiotic concentrations up to 500 mg/L and achieved 21.43% degradation efficiency in real diluted sewage, demonstrating practical real-world applicability.
chevron_right Technical Summary
Scientists discovered a bacterium that simultaneously breaks down two livestock antibiotics — tylosin and tilmicosin — in wastewater 1.6 times faster than any previously known microbe, using a novel enzyme that cleaves the antibiotics' ring structure. This offers a practical bioremediation tool for reducing antibiotic pollution before it reaches soil and crops.
Abstract Preview
The co-contamination of macrolide antibiotics tylosin (TYL) and tilmicosin (TLM) poses a persistent environmental threat, exacerbating the spread of antimicrobial resistance. Effective bioremediati...
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