Microbial life and the hidden potential for plastic biodegradation
Text and figure: Pere Puigbò, Autonomous University of Barcelona & University of Turku
Plastic pollution is one of the defining environmental challen- ges of our time, with micro- and nanoplastics now penetrating oceans, soils, freshwater systems and even polar ecosystems. A new study emerging from the MicroWorld project offers a stri- kingly unexpected perspective: the capacity to degrade plastics may already be embedded across the vast majority of micro- bial life on Earth. In a large international collaboration involving researchers from the Autonomous University of Barcelona, University Ramon Llull, the University of Turku, and the Institute of Scien- ce Tokyo, scientists have compiled the most comprehensi- ve resource to date on microbial plastic biodegradation. At the heart of this effort lies the Plastic-Degrading Clusters of Ort- hologous Groups (PDCOGs), a database containing more than 600,000 putative plastic-degrading proteins classified into 51 protein families. The scale of the findings is remarkable. The study reveals that over 95% of analyzed prokaryotic species—bacteria and archaea—carry at least one gene with the potential to degrade either natural or synthetic plastics. This suggests that the ability to interact with and break down plastic materials is not limited to a few specialized microbes, but rather represents a potential near-universal ecological trait shaped by evolution. This discovery significantly shifts the scientific perspecti- ve. For years, research has focused on isolated cases of plas- tic-degrading enzymes in specific organisms. The new genomic map instead demonstrates that these capabilities are widespread and potentially globally distribut-
metabolic capabilities, selecting for functions that may inciden- tally or deliberately act on plastic materials. For the plastics and materials sector, these findings open new avenues of innovation. Understanding which enzymes are pre- valent in specific environments—and under what conditions they function most effectively—provides a roadmap for desig- ning more sustainable materials. Future plastics could be engi- neered to align with naturally occurring microbial processes, enhancing their biodegradability in real-world conditions rat- her than under artificial laboratory settings. The implications extend into biotechnology and industry. The identification of diverse enzyme families capable of targe- ting different types of plastics—from synthetic polymers used in packaging to more complex materials—creates opportuni- ties for tailored biotechnological applications. Industries invol- ved in waste management, recycling, and sustainable packaging are already exploring how specific microbial strains and enzy- mes can be harnessed to improve plastic degradation processes under controlled conditions. Nevertheless, the translation from discovery to applicati- on remains complex. While the presence of plastic-degrading genes is widespread, actual biodegradation depends on multiple factors, including temperature, pH, oxygen availability, and the physical and chemical properties of the plastic itself. Moreover, optimal conditions often require the plastic to serve as a carbon source for the microorganism, enabling complete degradation rather than fragmentation into smaller particles.
Looking ahead, the most immediate impact of this research is likely to be in waste treatment and materials design. By leveraging microbial communities adapted to local environments, it may be possible to develop region-specific solutions for plastic degradation. At the same time, the findings raise important scientific questions about microbial evolution, ecologi- cal adaptation, and the long-term interac- tions between synthetic materials and biological systems.
ed. From deep-sea sediments to soils, from hot springs to polar environme- nts, microbial communities appear to harbor a latent potential to res- pond to plastic contamination.
Importantly, the study highlights that this bio- degradation capacity is not uniform. The distri- bution of plastic-de- grading enzymes varies across environments, reflecting ecological adap- tation. Certain habitats, such as soils and endoli- thic systems (microbial communities living insi- de rocks), show particu- larly high enrichment in these enzymes. This suggests that local envi- ronmental pressures may shape microbial
Ultimately, the MicroWorld study suggests a powerful and hopeful idea: nature may alrea- dy possess the tools needed to address plastic pollution. The challenge now lies in unders- tanding, optimizing, and respon- sibly applying this hidden micro- bial potential.
Figure 1. Schematic representation of bacteria producing a plastic-degrading enzyme involved in the breakdown of a plastic polymer.
20 MUOVIPLAST 3/2026
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