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Metagenomic analysis reveals the roles of Actinobacteria in plasticizer-contaminated landfills and aids in identifying key degraders
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Researchers used shotgun metagenomic analysis to show that Actinobacteria — particularly Streptomyces, Saccharopolyspora, and Nocardia — are the dominant degraders of phthalate plasticizers (DBP and DEHP) in landfill soil, with temperature influencing which genera dominate and suggesting novel degraders not previously linked to phthalate breakdown.
Phthalate ester (PAE) contamination, particularly from dibutyl phthalate (DBP) and di-2-ethylhexyl phthalate (DEHP), originating from landfills and released into the environment, poses a significant concern. Understanding PAE biodegradation is crucial for developing bioremediation strategies. This study used cover material from a 1-month-old landfill for soil microcosms. Indigenous microbes effectively removed 300 mg kg-1 of DBP and DEHP as individual and mixed substrates, achieving complete DBP removal and 70% DEHP removal at room temperature (27-30 °C) and 37 °C. Actinobacteria were dominant, indicating potential active PAE-degraders. Shotgun metagenomic analysis revealed an increased abundance of potential PAE catabolic genes, such as those encoding esterase, lipase, and dioxygenase, under all conditions, mainly associated with Streptomyces, Saccharopolyspora, Nocardia, Nocardioides, and Amycolatopsis. The genes associated with Saccharopolyspora were abundant at 37 °C, while those related to Nocardia and Actinomadura were prevalent at room temperature, suggesting temperature preferences. The genera Saccharopolyspora and Actinomadura have not been linked to PAE degradation, indicating potential novel PAE degraders. Furthermore, PAE-degrading bacteria were isolated using media designed from metagenomic data and were categorized into Streptomyces, Amycolatopsis, and Nocardia. This work highlights the roles of rare taxa and provides insights into potential novel PAE degraders, emphasizing the need for further research into these organisms.
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A bacterial strain Pseudarthrobacter defluvii E5 isolated from agricultural soil efficiently degraded multiple phthalate ester plasticizers including DEHP and DBP through a characterized enzymatic pathway, with key genes identified that could be targets for engineering enhanced bioremediation strains for phthalate-contaminated soils.
Plastic additives enrich diverse bacterial communities which show the hallmarks of plastic degradation
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Microbial communities enriched on plastic additives DEHT and tetradecane showed substrate-driven community shifts, with families like Nocardiaceae correlating with esterase activity indicative of plastic degradation, and novel families such as Vermiphiliaceae emerging as potential new degraders. Identifying microorganisms capable of metabolizing plastic additives that leach into the environment is a key step toward bioremediation strategies for microplastic-associated chemical pollution.
Microbiology combined with metabonomics revealing the response of soil microorganisms and their metabolic functions exposed to phthalic acid esters
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Researchers examined how common plastic plasticizers (phthalic acid esters) affect soil microorganisms and their metabolic functions using genomic sequencing and metabolomics. They found that while plasticizers did not significantly change bacterial diversity in the short term, they altered community structure and disrupted metabolic pathways, with dibutyl phthalate affecting 172 metabolites and 43 metabolic pathways. The study also identified certain soil bacteria with potential to degrade these plasticizer compounds.
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Researchers reviewed bioremediation approaches for removing phthalate plasticizers from contaminated environments, finding that microbial degradation — especially by bacteria and fungi capable of metabolizing these lipophilic compounds — offers a promising and cost-effective alternative to physicochemical treatment methods.
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Researchers showed that microbial communities enriched from compost and sediment can grow on chemical deconstruction and pyrolysis products of polyethylene terephthalate, polycarbonate, and high-density polyethylene plastics, demonstrating that combined chemical and biological processing is a viable strategy for breaking down multiple plastic types more rapidly than biodegradation alone.
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