Inter-domain microbial collaboration drives sulfamethoxazole in situ biodegradation in lake sediments.
Fang W, Zhang H, Li Y, Zhou J, Zhang Z
Bioremediation
The pond at the edge of your local park is almost certainly receiving antibiotic runoff from nearby agriculture, and the green algae floating on its surface may be quietly part of what keeps that water from becoming a reservoir of drug-resistant bacteria.
Antibiotics flushed through farms and hospitals end up settling into lake mud, where they can spread antibiotic resistance to surrounding ecosystems. Researchers found that bacteria, algae, and fungi don't work alone to clean this up — they form a tightly connected community where each group handles part of the job. Green algae turned out to be direct participants in breaking the antibiotic apart, not just passive bystanders.
Key Findings
After 30 days, microbial communities mineralized between 5.2% and 19.2% of sulfamethoxazole — the rate correlated significantly with how interconnected the microbial network was (P < 0.001).
Green algae (Scenedesmus), bacteria, and fungi directly degraded the antibiotic, while microscopic animals and protozoa accelerated the process indirectly through predation on other microbes.
The antibiotic was broken down via five chemical pathways including hydroxylation, acetylation, and bond cleavage, suggesting multiple microbial actors each contribute distinct biochemical steps.
chevron_right Technical Summary
Scientists discovered that bacteria and green algae work as a team to break down sulfamethoxazole — a common antibiotic pollutant — in lake sediment, with up to 19.2% of the antibiotic fully mineralized in 30 days. The more interconnected and diverse the microbial community, the faster the breakdown occurred.
Abstract Preview
Sulfonamide antibiotics (SAs) are pervasive contaminants in aquatic ecosystems and substantially contribute to the dissemination of antibiotic resistance. Microbial degradation represents the prima...
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