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An NMR look at an engineered PET depolymerase.

Cyril Charlier1, Sabine Gavalda2, Vinciane Borsenberger2

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Enzymes engineered to break down polyethylene terephthalate (PET) plastics are key to a circular economy. Nuclear Magnetic Resonance (NMR) studies reveal how mutations improve PET-degrading enzymes, identifying calcium-binding sites crucial for their function.

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Area of Science:

  • Biochemistry
  • Biotechnology
  • Environmental Science

Background:

  • Plastic pollution, particularly from polyethylene terephthalate (PET), poses a significant environmental challenge.
  • Enzymatic degradation offers a sustainable solution for plastic recycling, reducing reliance on fossil fuels.
  • Enzyme engineering has focused on improving the efficiency and characteristics of PET-degrading enzymes.

Purpose of the Study:

  • To investigate the structural and functional changes in Leaf-branch Compost Cutinase (LCC) during enzyme engineering for enhanced PET degradation.
  • To elucidate the role of calcium-binding sites in the thermal stability and unfolding process of LCC.
  • To probe the interaction between engineered LCC variants and PET monomers using Nuclear Magnetic Resonance (NMR).

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was employed to monitor LCC enzyme evolution through mutations.
  • Experimental determination of calcium-binding sites and their impact on thermal unfolding.
  • Utilized various NMR probes (backbone amide, methyl, histidine side-chain resonances) to study enzyme-substrate interactions.

Main Results:

  • Identified and characterized two critical calcium-binding sites in LCC, influencing its all-or-nothing thermal unfolding at 72°C.
  • Demonstrated the importance of these sites for enzyme stability, occurring near the PET glass transition temperature.
  • NMR experiments provided insights into the accessibility of the LCC active site to PET polymer chains via interactions with mono-(2-hydroxyethyl)terephthalic acid.

Conclusions:

  • The engineered quadruple mutant LCC exhibits enhanced PET-degrading capabilities.
  • Calcium-binding sites are essential for the thermal stability and function of LCC.
  • NMR is a powerful tool for understanding enzyme mechanisms in plastic degradation, paving the way for improved biocatalysts.