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Plastic-Degrading Microorganisms: Biodegradation Pathways and Habitat Origins
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Scientists have found that certain bacteria and fungi—living in places like landfills, soil, and compost—naturally produce enzymes that can break down different types of plastic, essentially "eating" them as food. This matters because plastic pollution (including the microplastics we're increasingly exposed to in food, water, and air) is a growing health concern, and these microbes could offer a natural, eco-friendly way to clean up plastic waste instead of relying on landfills or incineration. This paper is a review, meaning it summarizes and organizes findings from existing studies rather than presenting brand-new experiments.
Microbial biodegradation represents a promising approach to addressing global plastic pollution, yet the metabolic pathways and environmental origins of polymer-degrading microorganisms remain incompletely characterized. This review synthesizes current knowledge on biodegradation mechanisms across major polymer classes and identifies key environmental reservoirs harboring native plastic-degrading microbiota. Biodegradation pathways differ fundamentally according to polymer chemistry. Polyesters such as PET undergo hydrolytic cleavage by PETases and MHETases, releasing terephthalic acid and ethylene glycol for assimilation via the β-ketoadipate pathway and the TCA cycle. Biodegradable polyesters (PLA, PBAT, PHAs, PCL) are similarly hydrolyzed by cutinases, lipases, and depolymerases. In contrast, polyolefins (PE, PP) and polystyrene lack hydrolyzable bonds and require oxidative attack by laccases, peroxidases, and alkane monooxygenases, followed by β-oxidation to acetyl-CoA. Three principal environmental reservoirs supply plastic-degrading microorganisms: contaminated ecosystems including landfills and the plastisphere; soil microbiota contributing ligninolytic fungi and actinomycetes; and compost environments yielding thermostable enzymes such as leaf-branch compost cutinase. Across all environments, microbial consortia demonstrate superior degradation efficiency compared to single-species cultures, reflecting the enzymatic complexity required for complete polymer mineralization. Understanding these pathways and their environmental origins provides a foundation for biological plastic waste management strategies.
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Microbial and Enzymatic Strategies for Plastic Waste Biodegradation: Mechanistic Pathways, Environmental Challenges, and Emerging Biotechnological Strategies
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This review paper rounds up current science on using bacteria, fungi, and their enzymes to break down plastic waste instead of relying on burning or burying it, which can create toxic byproducts. This matters because plastics that don't fully break down often end up as microplastics in our water, food, and even our bodies, so finding safer, more effective ways to biodegrade plastic could help reduce that long-term exposure. The authors note that while lab results are promising, scaling these methods up for real-world use is still a major challenge.
Microbial ecology: A new perspective of plastic degradation
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This review explores the role of microorganisms including bacteria and fungi in biodegrading plastics in the environment. It surveys documented microbial species and mechanisms capable of breaking down various plastic types, discussing the potential of microbial ecology as a new framework for managing plastic pollution.
Bioremediation of plastics by the help of microbial tool: A way for control of plastic pollution
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This review covers how bacteria and fungi can be used to break down plastic waste, including microplastics, through natural biological processes. Various microorganisms can degrade different types of plastics by producing specific enzymes, though the process is slow and depends on the plastic type and environmental conditions. While biological degradation shows promise for reducing microplastic pollution in soil and water, much more research is needed to make it effective enough to address the scale of the problem.
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