What is it about?
Plastic pollution is a major global problem, and polyethylene terephthalate (PET)—used in bottles, packaging, and textiles—is one of the most common plastics. Scientists are exploring enzymes (called PET hydrolases) that can break down PET into reusable building blocks, offering a more sustainable recycling solution. In this study, we conducted a systematic review to understand how small changes (mutations) in these enzymes affect their ability to break down plastic. We analyzed results from multiple studies and combined experimental findings with computer simulations at the atomic level. The review shows that specific mutations can significantly improve how well these enzymes work, especially by increasing their activity and stability at higher temperatures. By examining the enzymes at the atomic scale, we identified key regions (“hotspots”) that control how efficiently they interact with and degrade PET.  Importantly, the study highlights how molecular dynamics simulations help explain why certain mutations improve performance, providing detailed insights into enzyme behavior that are not visible through experiments alone.
Featured Image
Photo by GUY GRANDJEAN on Unsplash
Why is it important?
Plastic waste is one of the most pressing environmental challenges, and current recycling methods are often inefficient or environmentally harmful. Enzymatic recycling offers a greener alternative, but natural enzymes are not yet efficient enough for large-scale use. This work is important because it systematically identifies which mutations make PET-degrading enzymes more effective. By understanding the structural and mechanistic basis of enzyme performance, the study helps guide the design of improved enzymes for industrial applications. The integration of computational modeling and experimental data provides a powerful framework for rational enzyme engineering, accelerating the development of solutions for plastic waste management.  Ultimately, this research supports the transition toward a circular economy for plastics, where materials can be broken down and reused efficiently rather than accumulating in the environment.
Perspectives
This work highlights the value of combining computational and experimental approaches to tackle complex environmental challenges. The use of atomistic simulations provides a deeper understanding of enzyme behavior, enabling more targeted and efficient design strategies. From a personal perspective, one of the key contributions is the identification of mutation “hotspots” that can be exploited to systematically improve enzyme performance. This moves the field from trial-and-error approaches toward more predictive and rational design. Looking ahead, integrating machine learning with molecular simulations could further accelerate enzyme engineering, allowing researchers to explore a wider range of mutations and optimize performance more efficiently. Such advances will be critical for scaling up enzymatic plastic recycling and developing sustainable solutions to reduce global plastic pollution.
Dr Antreas Afantitis
NovaMechanics Ltd
Read the Original
This page is a summary of: Atomistic-Level Insights into the Role of Mutations in the Engineering of PET Hydrolases: A Systematic Review, International Journal of Molecular Sciences, August 2025, MDPI AG,
DOI: 10.3390/ijms26167682.
You can read the full text:
Contributors
The following have contributed to this page
