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Related Experiment Videos

Directed evolution converts subtilisin E into a functional equivalent of thermitase.

H Zhao1, F H Arnold

  • 1Division of Chemistry and Chemical Engineering 210-41, California Institute of Technology, Pasadena 91125, USA.

Protein Engineering
|March 5, 1999
PubMed
Summary

Directed evolution successfully converted Bacillus subtilis subtilisin E into a highly thermostable enzyme, matching thermitase's properties. This method efficiently enhances enzyme stability without sacrificing activity.

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Area of Science:

  • Enzyme engineering
  • Protein thermostability
  • Directed evolution

Background:

  • Bacillus subtilis subtilisin E is a mesophilic protease.
  • Thermitase from Thermoactinomyces vulgaris is a homologous thermophilic protease.
  • Enhancing enzyme thermostability is crucial for industrial applications.

Purpose of the Study:

  • To engineer Bacillus subtilis subtilisin E into an enzyme with thermitase-like thermostability and activity.
  • To identify key mutations responsible for increased thermal adaptation.

Main Methods:

  • Directed evolution involving random mutagenesis, recombination, and screening over five generations.
  • Characterization of enzyme activity and half-life at various temperatures.
  • Comparison of amino acid sequences between wild-type subtilisin E, evolved variants, and thermitase.

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Main Results:

  • Evolved subtilisin E variant (5-3H5) achieved identical half-life and temperature optimum (Topt) at 83°C and 76°C, respectively, as thermitase.
  • The evolved enzyme exhibited a 17°C higher Topt and over 200-fold increased half-life at 65°C compared to wild-type subtilisin E.
  • Eight amino acid substitutions were sufficient to confer high thermostability, with some novel mutations identified.

Conclusions:

  • Directed evolution is a powerful strategy for enhancing enzyme thermostability.
  • Minimal amino acid changes can significantly improve thermal adaptation without compromising activity.
  • This approach offers insights into protein thermal adaptation mechanisms.