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Ester bond pre-activation for high-efficiency biodegradation: A self-reinforcing degradation strategy for PET via an evolved bacterium
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Scientists evolved a special bacterium that can break down PET plastic (used in bottles and clothing) even in harsh, alkaline wastewater, the kind found in some industrial runoff, where normal plastic-eating microbes can't survive. This matters because it offers a gentler, more sustainable way to clean up plastic pollution at its source, potentially reducing the amount of PET and microplastics that end up contaminating water, soil, and eventually our food and bodies.
Polyethylene terephthalate (PET) is a hazardous environmental contaminant that contributes to both plastic and microplastic pollution, with its biodegradation severely limited by the kinetic stability of ester bonds-particularly in alkaline industrial wastewater (pH 9-11) where most known biocatalysts are inactive. To overcome this, evolutionary engineering was employed to construct a whole-cell biocatalyst for alkaline environments. Through UV-LiCl mutagenesis and adaptive laboratory evolution, an alkaline-adapted Comamonas testosteroni strain F6 was developed, thriving at pH 10 with PET as sole carbon source. Strain F6 increased weight loss from 2.4% to 6.1% in 3 days and accelerated terephthalic acid release versus the wild-type under neutral conditions. This improvement arises from a synergistic mechanism: alkaline conditions chemically pre-activate ester bonds, and the released monomers fuel microbial growth and enzyme secretion, establishing a self-reinforcing degradation cycle. This feedback-driven process caused severe surface erosion, reducing fiber diameter from 20.2 to 18.1 μm. The system operates at mild pH 10 and 37 °C with a self-moderating effect that partially neutralizes alkalinity, contrasting with harsh chemical hydrolysis (pH >13, high temperature). This work provides a theoretical basis for using substrate pre-activation and evolved biocatalysis to treat PET-contaminated alkaline industrial effluents.
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Scientists engineered a bacterium that can actually eat and break down PET plastic (the kind used in water bottles and food containers) as its food source, even surviving in real wastewater. This matters because PET pollution breaks down into microplastics that contaminate our water, food, and bodies—and this bacteria-based approach could offer a more practical way to clean up plastic waste that's otherwise hard to collect and recycle.
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Scientists engineered a bacterial enzyme to break down plastic waste more efficiently, turning PET (the plastic in water bottles) into valuable, reusable chemical building blocks instead of just breaking it into low-value pieces. This matters because better plastic recycling technology could reduce the mountains of plastic waste that eventually break down into microplastics—tiny particles increasingly found in our water, food, and even our bodies, where researchers are still studying their potential health effects.
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Scientists engineered bacteria to better survive heat by boosting a natural "heat-shield" protein, making them nearly twice as effective at breaking down PET plastic (the material in water bottles) at higher temperatures. This matters because plastic pollution—including the microplastics that end up in our water, food, and bodies—is a growing health concern, and heat-resistant, plastic-eating microbes could offer a more practical, real-world tool for cleaning it up.
Plastic degradation by enzymatic methods
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Scientists found a way to help special enzymes break down PET plastic (the material in water bottles and polyester clothing) much more efficiently by giving it a gentle pre-treatment first—like softening it up before the enzymes get to work. This matters because it could lead to better recycling methods that actually break plastic down into reusable building blocks instead of letting it pile up in landfills or break into the microplastics that end up in our water, food, and bodies.
In Vitro Degradation of Polyethylene Terephthalate using Pseudomonas species
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Scientists found bacteria in wastewater sludge—naturally occurring, not lab-engineered—that can break down PET plastic (the type used in water bottles), with one strain called *Pseudomonas stutzeri* eating away nearly a third of a plastic sample's weight over two months. This matters because PET plastic breaks down into microplastics that pollute our environment and end up in our food and water, so finding natural microbes that can safely degrade it could lead to more eco-friendly ways to manage plastic waste. Interestingly, combining bacteria didn't work better than using one strain alone, showing that plastic-eating micro
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