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Area of Science:

  • Biotechnology
  • Polymer Science
  • Enzymology

Background:

  • Biocatalytic polyester recycling is advancing, prompting exploration of enzymatic deconstruction for other polymers like polyamides (PA).
  • Nature possesses various amide-cleaving enzymes, making PA a potential target for enzymatic degradation.

Purpose of the Study:

  • To screen a diverse set of nylon-hydrolyzing enzymes (nylonases) for their ability to depolymerize nylon-6 (PA6).
  • To identify highly active nylonases and understand the limitations of enzymatic PA6 deconstruction.

Main Methods:

  • Screening of 40 natural and engineered nylonases against PA6 films.
  • Quantification of hydrolysis products using mass spectrometry.
  • Time-course reactions at varying temperatures (40-70°C) to assess enzyme activity and depolymerization extent.

Main Results:

  • Significant PA6 deconstruction activity was rare among the screened nylonases.
  • A thermostabilized N-terminal nucleophile (Ntn) hydrolase variant, NylCK-TS, showed the highest activity, hydrolyzing 0.67 wt% of a PA6 film.
  • Enzyme addition after initial reaction failed to restart depolymerization, indicating substrate-based limitations.

Conclusions:

  • Ntn hydrolases show potential for further development in PA6 enzymatic depolymerization.
  • Key challenges for advancing PA6 enzymatic depolymerization include improving enzyme activity, product selectivity, and polymer accessibility.