Researchers Discover Novel Enzyme from Bacteria That Can Break Down PFAS Compounds
Scientists identified a new enzyme from the bacterium Achromobacter mucicolens that can break the strong carbon-fluorine bonds in PFOA, a common PFAS (per- and polyfluoroalkyl substances) contaminant. The enzyme achieved a 17% conversion rate in laboratory tests within 24 hours, offering a potential biological alternative to energy-intensive chemical remediation methods. This discovery could lead to more efficient and sustainable approaches for cleaning up PFAS-contaminated sites.
Researchers purified and characterized a haloacid dehalogenase type II (HAD-II) enzyme capable of directly breaking down perfluorooctanoic acid (PFOA), one of the most persistent PFAS compounds. The enzyme was discovered in sediment from a PFAS-contaminated lake, suggesting natural microbial adaptation to these synthetic pollutants. In cell-free enzyme assays, the system released approximately 0.55 ppm of fluoride from a 5 ppm PFOA solution over 24 hours. Structural analysis revealed that this newly discovered enzyme belongs to a distinct evolutionary lineage with only 25% sequence similarity to previously known PFAS-degrading enzymes, yet it maintains the core catalytic structure necessary for function. The researchers used molecular docking to explain how this enzyme achieves PFOA breakdown through a productive binding mechanism that differs from related enzymes. This work suggests that biological remediation strategies targeting PFAS contamination may be more diverse and effective than previously understood.
What's missing
The study does not discuss scalability to field conditions, cost-effectiveness compared to existing remediation methods, potential byproducts or toxicity of the defluorination process, or whether the enzyme can degrade other PFAS compounds beyond PFOA. Additionally, the practical applicability of this cell-free enzyme system for real-world contaminated sites remains unclear.
What different sources said
- bioRxivCenter
Discovery of a novel dehalogenase from Achromobacter mucicolens for PFAS defluorination
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