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Structure-Guided Immobilization of an Evolved Unspecific Peroxygenase.

Patricia Molina-Espeja1, Paloma Santos-Moriano2,3, Eva García-Ruiz4

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Summary

This study details the immobilization of a laboratory-evolved unspecific peroxygenase (UPO) using a one-point attachment method. The engineered enzyme, with a specific mutation, maintained its activity and showed homogeneous distribution on various carriers for applied synthetic chemistry.

Keywords:
directed evolutionoxyfunctionalizationstructure-guided immobilizationunspecific peroxygenase

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Area of Science:

  • Biocatalysis
  • Protein Engineering
  • Immobilization Techniques

Background:

  • Unspecific peroxygenases (UPOs) are versatile enzymes with inherent mono(per)oxygenase capabilities.
  • Enzyme immobilization is crucial for enhancing biocatalyst stability and reusability in industrial applications.
  • Controlling enzyme orientation during immobilization is key to preserving catalytic activity.

Purpose of the Study:

  • To develop a method for covalently immobilizing a laboratory-evolved yeast-secreted UPO.
  • To ensure enzyme activity and proper orientation through a specific surface mutation (S221C).
  • To evaluate the distribution and biochemical characteristics of the immobilized UPO.

Main Methods:

  • Site-directed mutagenesis to introduce the S221C mutation for single disulfide bridge formation.
  • Covalent immobilization of the engineered UPO onto activated carriers via one-point attachment.
  • Fluorescence confocal microscopy for assessing enzyme distribution.
  • Biochemical characterization of the immobilized biocatalyst.

Main Results:

  • Successful one-point covalent immobilization of the engineered UPO was achieved.
  • The S221C mutation facilitated controlled orientation and disulfide bond formation with the support.
  • Homogeneous enzyme distribution was confirmed across different carrier materials.
  • The immobilized UPO retained its biochemical activity, demonstrating its potential for practical use.

Conclusions:

  • The developed immobilization strategy effectively preserves UPO activity and ensures controlled orientation.
  • This method offers a robust platform for creating stable and reusable UPO biocatalysts.
  • The immobilized UPO presents a promising tool for advancements in applied synthetic chemistry.