Plant compound helps enzymes destroy antibiotic pollution in water
Li B, Zhu H, Song H, Li H, Cheng W
Phytoremediation
The antibiotics that wash off farms and into streams and park ponds can linger for years, and this plant-derived helper molecule offers a cheap, natural way to break them down before they harm aquatic life.
Researchers wanted to clean antibiotic pollution out of water using a natural enzyme called laccase, but the enzyme alone isn't very effective. They discovered that caffeic acid, a compound found in many plants and coffee, changes the enzyme's shape just enough to grip onto antibiotic molecules better and break them apart. Using this combo, they destroyed over 90% of two widespread antibiotics in water and also made the leftover breakdown products less toxic.
Key Findings
Caffeic acid (CA) triggers a structural shift in laccase's active pocket, changing a β-sheet to a loop and improving binding stability with antibiotics.
The laccase-mediator system with CA degraded over 90% of tetracycline and sulfamethoxazole individually; in a mixed-antibiotic test it removed 88.17% of tetracycline in 3 hours and 98.71% of sulfamethoxazole in 1 hour.
Protocatechuic acid, a close chemical relative of caffeic acid, worked similarly well (95.10% tetracycline degradation at 2 hours, 94.89% sulfamethoxazole at 1 hour), and toxicity tests confirmed the breakdown products were significantly less harmful.
chevron_right Technical Summary
Scientists found that adding a natural compound called caffeic acid boosts an enzyme's ability to break down two common antibiotics, tetracycline and sulfamethoxazole, in contaminated water, removing over 90% of each within a few hours.
Abstract Preview
Original paper
Insights into redox mediator-enhanced laccase degradation of tetracycline and sulfamethoxazole: MD simulations and experimental validation.
Laccase-mediator systems (LMS) can be used to degrade antibiotics due to their electron-transfer mechanism. However, the impact of mediators on conformational changes in laccase structure remains u...
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