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Ideonella sakaiensis Can Metabolize Bisphenol A as a Carbon Source
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Researchers discovered that Ideonella sakaiensis — the bacterium famous for degrading PET plastic — can also use bisphenol A (BPA) as a food source, and that its key enzymes (PETase and MHETase) can bind BPA and its analogue BPS. This matters because BPA is a widespread endocrine-disrupting plastic additive; a bacterium that degrades both PET and BPA could address two linked plastic pollution problems simultaneously.
Bisphenol A and its analogues represent a significant environmental and public health hazard, particularly affecting the endocrine systems of children and newborns. Due to the growing need for non-pathogenic biodegradation microbial agents as environmentally friendly and cost-effective solutions to eliminate endocrine disruptors, this study aimed to investigate the degradation of bisphenol A by Ideonella sakaiensis, based on its currently understood unique enzymatic machinery that is already well known for degrading polyethylene terephthalate. The present study provides novel insights into the metabolic competence and growth particularities of I. sakaiensis. The growth of I. sakaiensis exposed to bisphenol A exceeded that in the control conditions, starting with 72 h in a 70% nutrient-rich medium and starting with 48 h in a 100% nutrient-rich medium. Computational modeling showed that bisphenol A, as well as its analogue bisphenol S, are possible substrates of PETase and MHETase. The use of bisphenol A as a carbon and energy source through a pure I. sakaiensis culture expands the known substrate spectra and the species' potential as a new candidate for bisphenol A bioremediation processes.
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A mini-review on the role of PETase in polyethylene terephthalate degradation
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This mini-review summarized the structure, performance enhancement approaches, and potential applications of PETase, the enzyme from Ideonella sakaiensis discovered in 2016 that uses PET plastic as a carbon source, alongside MHETase for complete degradation into terephthalic acid and ethylene glycol. The review highlighted progress in enzyme engineering for improved PETase activity and discussed applications in bioremediation and recycling, identifying it as a key candidate for addressing the global plastic waste problem through biological degradation.
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Scientists studied a bacterium that can actually eat plastic bottles (PET), figuring out which internal tools and processes it uses to break the plastic down into simpler substances. This matters because plastic pollution, including the microplastics increasingly found in our food, water, and even our bodies, is a growing health concern, and understanding how nature can break down plastic waste could eventually help us develop better ways to clean up this pollution before it affects us further.
Explorations of Polyethylene Terephthalate (PET) Hydrolase for addressing PET Plastic Pollution
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This review explores the biology of PETase enzymes and their potential for addressing PET plastic pollution, covering the discovery of Ideonella sakaiensis and subsequent enzyme engineering efforts. Developing efficient PET-degrading enzymes is a promising biotechnological strategy for reducing plastic pollution at scale.
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Scientists engineered a soil bacterium to break down PET plastic, one of the most common plastics in food packaging and textiles, by giving it the ability to produce and secrete a powerful plastic-degrading enzyme. This is one of the first demonstrations of a living microorganism that can directly consume PET as a food source, which could lead to more sustainable recycling approaches.
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This overview reviewed the role of plastics in modern society, their environmental impacts, conventional management approaches, and the use of PET-degrading bacteria including Ideonella sakaiensis and Thermobifida fusca as sustainable alternative approaches to plastic waste management. The paper highlighted that despite centuries required for complete plastic degradation by conventional means, bacterial PET degradation offers a promising pathway, though challenges remain in scaling biological solutions to match the scope of global PET pollution.
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