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Probing Enzymatic PET Degradation: Molecular Dynamics Analysis of Cutinase Adsorption and Stability
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This study used all-atom molecular dynamics simulations to reveal that the LCC-ICCG cutinase enzyme binds to PET plastic surfaces primarily through hydrophobic and aromatic interactions, with minimal structural changes to the enzyme and a 24% reduction in enzyme-water hydrogen bonds upon adsorption, clarifying key initial steps of enzymatic PET degradation.
Understanding the mechanisms influencing poly(ethylene terephthalate) (PET) biodegradation is crucial for developing innovative strategies to accelerate the breakdown of this persistent plastic. In this study, we employed all-atom molecular dynamics simulation to investigate the adsorption process of the LCC-ICCG cutinase enzyme onto the PET surface. Our results revealed that hydrophobic, π-π, and H bond interactions, specifically involving aliphatic, aromatic, and polar uncharged amino acids, were the primary driving forces for the adsorption of the cutinase enzyme onto PET. Additionally, we observed a negligible change in the enzyme's tertiary structure during the interaction with PET (RMSD = 1.35 Å), while its secondary structures remained remarkably stable. Quantitative analysis further demonstrated that there is about a 24% decrease in the number of enzyme-water hydrogen bonds upon adsorption onto the PET surface. The significance of this study lies in unraveling the molecular intricacies of the adsorption process, providing valuable insights into the initial steps of enzymatic PET degradation.
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From Bulk to Binding: Decoding the Entry of PET into Hydrolase Binding Pockets
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Researchers used computational and structural analyses to decode how PET polymer chains enter and bind within the active sites of plastic-degrading hydrolase enzymes, providing mechanistic insights that could guide engineering of more efficient PETase variants for industrial recycling applications.
Atomistic-Level Insights into the Role of Mutations in the Engineering of PET Hydrolases: A Systematic Review
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This systematic review examined the role of mutations in engineering PET-degrading enzymes including TfCut2, IsPETase, and LCC across 20 studies, integrating molecular dynamics simulations with experimental findings. The review identifies key residue hotspots enhancing catalytic performance and thermostability, demonstrating MD simulations as powerful tools guiding targeted mutation strategies for enzymatic plastic degradation.
From Bulk to Binding: Decoding the Entry of PET into Hydrolase Binding Pockets
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Researchers used molecular dynamics simulations and free energy analysis to decode the complete pathway by which PET polymer chains enter the binding pockets of plastic-degrading hydrolase enzymes at the atomic level. The study aims to deepen mechanistic understanding needed to guide protein engineering of PET hydrolases toward sufficient activity for industrial biocatalytic recycling.
Insights into the Enhancement of the Poly(ethylene terephthalate) Degradation by FAST-PETase from Computational Modeling
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"Researchers used classical and quantum mechanical/molecular mechanics simulations to reveal why the engineered enzyme FAST-PETase degrades PET plastic far more efficiently than its parent enzyme PETase, tracing the enhancement to a single N233K mutation that increases the basicity of a catalytic residue and lowers the energy barrier for the rate-limiting acylation step by over 4 kcal/mol. These findings provide molecular-level design principles for engineering even more effective plastic-degrading enzymes."
On the Role of Temperature in the Depolymerization of PET by FAST‐PETase: An Atomistic Point of View on Possible Active Site Pre‐Organization and Substrate‐Destabilization Effects
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Researchers used molecular simulations to understand why the plastic-degrading enzyme FAST-PETase works better at 50°C than at lower temperatures when breaking down PET plastic. They found that at the optimal temperature the enzyme's active site pre-organizes itself to bind PET more efficiently, and the enzyme forces the plastic into a more reactive shape. Understanding these mechanisms can guide the engineering of even more effective enzymes for breaking down PET microplastics and plastic waste at practical scales.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.