Nature is evolving to digest our synthetic waste in real-time
In short: We produce 300 million tons of new plastic annually, with less than 10 percent recycled. However, marine microbes are already adapting. Scientists have identified a specific molecular signature in bacteria that allows them to treat our discarded bottles and fabrics as a viable food source.
For decades, the scientific consensus was that polyethylene terephthalate (PET)—the durable plastic used in clothing and drink bottles—was virtually impossible to degrade naturally. This changed in 2016 when a bacterium in a Japanese recycling plant was discovered surviving by consuming plastic waste. This discovery sparked a global search to see if other organisms, particularly in the oceans, had independently evolved similar capabilities to handle human-made debris.
Researchers at the King Abdullah University of Science and Technology (KAUST) conducted a global study of over 400 ocean samples to find these microbes. They identified a specific structural feature called the M5 motif. This acts as a molecular fingerprint on a plastic-degrading enzyme known as PETase. The M5 motif distinguishes functional enzymes from inactive look-alikes, signaling the microbe's ability to dismantle plastic polymers into their basic building blocks.
The prevalence of these microbes is striking. Functional PETases containing the M5 motif were found in nearly 80 percent of the tested waters, spanning from surface gyres to depths of nearly two kilometers. In carbon-scarce environments like the deep sea, these microbes appear to have fine-tuned their enzymes to exploit plastic as a new carbon source. This rapid adaptation suggests that nature is actively integrating human pollution into its biological cycles.
The discovery of the M5 motif is significant because it allows scientists to understand how these enzymes evolved from older, hydrocarbon-degrading enzymes. By identifying this signature, researchers can better map the genetic activity of plastic-eating microbes, which are notably active in areas heavily polluted with plastic waste. It provides a potential blueprint for managing the global waste crisis by harnessing evolution's own recycling mechanisms.
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Sources
- Summary by Intellect · source: These bacteria eat plastic | Morgan Vague
- Also: Plastic-eating bacteria discovered in the ocean
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