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Exploring the pH dependence of an improved PETase
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Scientists are studying an engineered enzyme that can break down plastic bottles (PET plastic) for recycling, hoping to reduce the flood of plastic waste that eventually breaks into microplastics polluting our food, water, and bodies. This study found that the enzyme behaves differently when working on solid plastic versus dissolved plastic bits, suggesting scientists need to rethink how they design these enzymes to work efficiently on real-world plastic waste, not just in lab conditions. While this doesn't directly affect your health today, better plastic-eating enzymes could eventually mean less plastic pollution and fewer micro
Enzymatic recycling of plastic and especially of polyethylene terephthalate (PET) has shown great potential to reduce its negative impact on our society. PET hydrolases (PETases) have been optimized using rational design and machine learning, but the mechanistic details of the PET depolymerization process remain unclear. Belonging to the carboxylic-ester hydrolase family with a canonical Ser-His-Asp catalytic triad, their observed alkaline pH optimum is generally thought to be related to the protonation state of the catalytic His. Here, we explore this aspect in the context of LCCICCG, an optimized PETase, derived from the leaf-branch compost cutinase enzyme. We use NMR to identify the dominant tautomeric structure of the six histidines. Five show surprisingly low pKa values below 4.0, whereas the catalytic H242 in the active enzyme displays a pKa value that varies from 4.9 to 4.7 when temperatures increase from 30°C to 50°C. Whereas the hydrolytic activity of the enzyme toward a soluble substrate can be modeled by the corresponding protonation/deprotonation curve, an important discrepancy is found when the substrate is the solid plastic. This opens the way to further mechanistic understanding of the PETase activity and underscores the importance of studying the enzyme at the liquid-solid interface.
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Mechanistic studies of a lipase unveil a dramatic effect of pH on the selectivity toward the hydrolysis of PET oligomers
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Researchers studied how pH dramatically affects the selectivity and efficiency of a lipase enzyme when breaking down PET plastic oligomers, revealing mechanistic insights relevant to improving enzymatic plastic recycling processes. The findings highlight pH as a key variable in engineering more effective biocatalysts for plastic degradation.
Enzymatic Biodegradation of PET Plastics
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Plastic bottles and containers (made of PET) don't break down naturally—they just crumble into tiny microplastic pieces that end up in our food, water, and eventually our bodies. This review paper explains how scientists are studying special bacterial enzymes (called PETase and MHETase) that can actually digest PET plastic into harmless building blocks, offering a promising tool for cleaning up plastic pollution before it becomes a bigger health problem.
Overcoming catalytic barriers to reprogram acyltransferases for bis(2-hydroxyethyl) terephthalate hydrolysis
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Scientists engineered a bacterial enzyme to break down plastic waste more efficiently, turning PET (the plastic in water bottles) into valuable, reusable chemical building blocks instead of just breaking it into low-value pieces. This matters because better plastic recycling technology could reduce the mountains of plastic waste that eventually break down into microplastics—tiny particles increasingly found in our water, food, and even our bodies, where researchers are still studying their potential health effects.
Plastic degradation by enzymatic methods
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Scientists found a way to help special enzymes break down PET plastic (the material in water bottles and polyester clothing) much more efficiently by giving it a gentle pre-treatment first—like softening it up before the enzymes get to work. This matters because it could lead to better recycling methods that actually break plastic down into reusable building blocks instead of letting it pile up in landfills or break into the microplastics that end up in our water, food, and bodies.
Environmental Implications of Plastic-degrading Bacterial Enzymes in Polyethylene Terephthalate Bioremediation
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Scientists have discovered bacteria that produce special enzymes capable of breaking down PET plastic (the material used in water bottles and food packaging) into simpler, harmless building blocks—a promising alternative to traditional recycling that could reduce plastic waste and the microplastics that end up in our water, food, and bodies. This review paper pulls together existing research to show that while these enzymes work well in controlled industrial settings, using them out in nature (like oceans or landfills) still needs more safety testing before we can trust it won't cause unexpected environmental problems. In short, this is encouraging progress toward tackling plastic poll
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