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Plastic-degrading enzymes: Advances, challenges, and industrial prospects in enzyme engineering and computational design
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Scientists are engineering special enzymes that can break down plastic waste, like water bottles and packaging, into harmless, reusable materials, using tools like AI to design better versions faster. This review rounds up recent progress in the field, and matters because plastic pollution and the microplastics it creates are increasingly linked to health concerns, so finding real ways to break down plastic (rather than just recycling it) could reduce our long-term exposure and environmental harm.
The accumulation of plastic waste is causing fatal environmental problems that threaten human health. The environmental threat posed by plastics stems from their persistence, potential for bioaccumulation, and inability to degrade via conventional waste disposal methods or physicochemical processes. As a promising alternative, enzyme-based degradation is a practical solution owing to the highly efficient and specific catalytic capacity of enzymes to depolymerize plastic polymers into non-toxic and reusable by-products. Techniques such as enzyme engineering and elucidation of biochemical pathways have led to the identification and optimization of plastic-degrading enzymes (e.g., PETase, MHETase, and cutinases) capable of hydrolyzing recalcitrant polymers (e.g., polyethylene terephthalate (PET), polyethylene (PE), and polypropylene (PP)) under specific environmental conditions. Further advances in modern techniques, such as rational design, directed evolution, metagenomics, and synthetic biology pathways, have increased enzyme stability, activity, and substrate affinity to improve plastic degradation efficiency. Researchers are also exploring the use of microbial consortia and multi-enzyme cocktail formulations to optimize the synergism of plastic bioremediation. Computational methods and artificial intelligence (AI) serve as ideal platforms for predicting enzyme-substrate interactions, site-specific mutagenesis, and accelerating the process of discovering new biocatalysts. Recent advances in protein engineering, synthetic biology, and AI-assisted enzyme design have substantially improved catalytic efficiency, thermostability, and plastic depolymerization performance, accelerating the development of next-generation biocatalysts for plastic waste remediation. Together, these innovations represent a sustainable and scalable solution for plastic pollution, potentially driving a circular plastic economy. This review highlights the interdisciplinary approaches and outlook of the current status of enzyme-mediated plastic degradation technologies.
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Programmable biodegradation: Lipase-driven microplastic degradation via AI and omics
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Scientists are engineering special enzymes called lipases, think of them as molecular scissors, that can break down plastic waste, including the tiny microplastics that end up in our water, food, and even our bodies. This review paper (which summarizes existing research rather than presenting brand-new experiments) explains how combining AI with biology could make these plastic-eating enzymes faster and more durable, though scientists still need to figure out how to make them work well outside the lab. If successful, this approach could eventually offer a real, scalable way to clean up microplastic pollution rather than relying on energy-heavy chemical processes.
Plastic pollution and its global environmental impacts: a comprehensive review of microbial biodegradation mechanisms, plastic-degrading enzymes, emerging biotechnological strategies and artificial intelligence-driven approaches for sustainable plastic waste management
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This review pulls together current research on using bacteria and enzymes to break down plastic waste instead of relying on landfills or incineration, which are costly and create their own pollution. Scientists are now pairing this "microbial recycling" with artificial intelligence to speed up the discovery of plastic-eating enzymes, though the technology still needs more real-world testing before it can be scaled up. This matters because plastic waste breaks down into micro- and nanoplastics that are turning up in our water, food and even our bodies, so finding better ways to eliminate plastic waste could reduce our long-term exposure to these particles.
Deep Learning-driven synergistic engineering of PET hydrolase for post-consumer PET depolymerization.
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Scientists used AI to redesign an enzyme that breaks down PET plastic (the kind used in water bottles), making it nearly twice as effective at digesting real-world plastic waste, even the dirty, previously-used kind. This matters because better plastic-eating enzymes could help recycle plastic more efficiently instead of it piling up in landfills or breaking down into microplastics that end up in our water, food, and bodies.
Discovering hidden candidate plastic-degrading enzymes: Combined multi-omics and machine learning strategy
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Scientists used AI and genetic analysis to hunt for natural bacterial enzymes that can break down common plastics like polyethylene and polyurethane, materials linked to microplastic pollution that ends up in our food, water, and even bloodstream. By studying microbes that had been feeding on plastic for a long time, they identified promising new plastic-eating enzymes that hadn't been found before, some made by a bacterium called Rhodococcus aetherivorans. This matters because finding better plastic-degrading enzymes could eventually lead to more effective ways to clean up plastic waste, potentially reducing the microplastics
Deep learning-guided design of hydrolases for crystalline PET depolymerization
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Scientists used AI to design a super-enzyme that can break down PET plastic (the material in water bottles and clothing) into its original building blocks, even without needing to pre-treat or heat-soften the plastic first—something that's been a major roadblock for plastic recycling. This matters because PET plastic pollution takes centuries to break down naturally and sheds microplastics into our food, water, and bodies; this enzyme could enable truly circular recycling where old plastic becomes new, high-quality plastic again instead of ending up in landfills, oceans, or our bloodstreams.
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