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A cold-adapted protease engineered by experimental evolution system.

S Taguchi1, A Ozaki, T Nonaka

  • 1Department of Biological Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan. staguchi@postman.riken.ac.jp

Journal of Biochemistry
|September 30, 1999
PubMed
Summary
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Researchers engineered a cold-adapted subtilisin BPN

Area of Science:

  • Biochemistry
  • Protein Engineering
  • Enzymology

Background:

  • Subtilisin BPN' is a widely used protease.
  • Improving enzyme activity at low temperatures is crucial for various industrial applications.
  • Directed evolution and mutagenesis are key strategies for enzyme engineering.

Purpose of the Study:

  • To develop a cold-adapted subtilisin BPN' mutant with enhanced activity at low temperatures.
  • To identify the specific mutations responsible for improved cold adaptation.
  • To understand the structural basis of enhanced catalytic efficiency.

Main Methods:

  • In vitro random mutagenesis and screening using a two-step evolutionary program.
  • Kinetic analysis (k(cat)/K(m)) at low temperatures (10°C).

Related Experiment Videos

  • Genetic analysis to identify mutations.
  • Molecular modeling to predict structural changes.

    • Main Results:

    • A novel cold-adapted mutant, m-51, was successfully isolated.
    • The m-51 mutant exhibited a 70% higher catalytic efficiency (k(cat)/K(m)) at 10°C compared to wild-type subtilisin BPN'.
    • The enhanced activity was primarily due to an increase in k(cat) and resulted from three mutations: A-31T, A88V, and A98T.

    Conclusions:

    • The engineered m-51 mutant demonstrates significantly improved catalytic efficiency at low temperatures.
    • The mutations A88V and A98T synergistically enhance protease activity, with A98T being the primary driver.
    • Molecular modeling suggests that compensatory structural changes in the double mutant (A88V/A98T) contribute to the enhanced activity.