Intracellular bioaccumulation outperforms surface display: A superior strategy for sustainable arsenic bioremediation through ArsR-ArsC coexpression.
Li J, Chen Z, Xiong Y, Zhai J, Su Y
Phytoremediation
Arsenic seeping from natural rock and agricultural runoff quietly contaminates wells and irrigation water worldwide, and the vegetables grown with that water — including ones in home gardens fed by private wells — can accumulate it in their roots and leaves.
Scientists created special bacteria that soak up arsenic — a toxic metal found in contaminated water — and trap it inside themselves instead of letting it back out. By growing these bacteria in a sticky mat called a biofilm on a surface, they built a kind of living filter that can clean polluted water quickly and safely. The key surprise was that trapping arsenic inside the bacteria worked better than displaying arsenic-grabbing proteins on the outside, which flips what scientists previously assumed was the best approach.
Key Findings
Both engineered bacterial strains removed over 96% of arsenic (at 10 µg/L) within 5 hours, substantially faster than typical biological systems that require 20–24 hours.
At the higher concentration of 100 µg/L, the constitutive-expression strain (MT047) still achieved 76.2% removal of As(III) and 55.9% of As(V).
Intracellular accumulation outperformed surface-display strategies in biofilm applications, with MT047 achieving 71.8% removal of 100 µg/L As(III) within 24 hours.
chevron_right Technical Summary
Researchers engineered bacteria that lock arsenic inside their cells rather than displaying it on their surface, removing over 96% of arsenic from water in just 5 hours — far faster than previous biological methods and forming a simple 'plug-and-play' biofilm filter for real-world use.
Abstract Preview
Arsenic contamination in water poses a serious threat to public health, potentially causing various health issues. Therefore, effective remediation technologies are needed to remove arsenic contami...
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