AI Summary
The article discusses the development of "living plastics" through synthetic biology and polymer engineering as a solution for plastic degradation. Researchers engineered Bacillus subtilis spores to produce a plastic-degrading enzyme, which, when embedded in plastic matrices, can break down plastic when triggered by specific conditions like composting or surface erosion. This innovation addresses plastic pollution issues while maintaining the material's physical properties.
A study published in Nature Chemical Biology leverages the natural resilience of spores, which can endure extreme environmental conditions, by programming them to secrete plastic-degrading enzymes under specific circumstances. These spores are embedded into plastic matrices through standard plastic processing methods, such as high temperature, high pressure, or the use of organic solvents.
In normal conditions, the spores remain dormant, ensuring the plastic’s stable performance. However, when exposed to specific triggers like surface erosion or composting, the spores activate and initiate the degradation process, leading to the plastic’s complete breakdown.
The invention of plastics has improved our daily lives, but the massive production and improper disposal of plastic waste have made plastic pollution a major environmental issue. In 2016, Yoshida and team discovered a bacterium, Ideonella sakaiensis, in poly (ethylene terephthalate) (PET)-contaminated soil near a recycling facility in Japan. This bacterium can grow using PET as its main carbon source by producing two key enzymes: PETase and MHETase.
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