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Related Experiment Video

Updated: Jul 18, 2026

Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening
10:50

Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening

Published on: April 1, 2016

Various mutations by using yeast gene for protein-engineering.

Seiya Watanabe1, Tsutomu Kodaki, Keisuke Makino

  • 1Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan.

Nucleic Acids Symposium Series (2004)
|December 8, 2006
PubMed
Summary

Protein engineering enhanced yeast

Area of Science:

  • Biochemistry and metabolic engineering.

Background:

  • Efficient conversion of xylose to ethanol by yeast is crucial for biofuel production.
  • Xylose fermentation requires the enzyme xylitol dehydrogenase (XDH).
  • Native XDH often has limitations in stability and cofactor dependency.

Purpose of the Study:

  • To engineer a more efficient and thermostable xylitol dehydrogenase (XDH) for improved ethanol fermentation from xylose.
  • To enhance the catalytic efficiency of XDH with NADP+.

Main Methods:

  • Protein engineering techniques, including multiple site-directed mutagenesis, were employed.
  • Introduction of a structural zinc atom was used to enhance thermostability.
  • Characterization of the engineered XDH variants for enzymatic activity and stability.

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Last Updated: Jul 18, 2026

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Published on: December 15, 2012

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05:49

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Main Results:

  • A NADP+-dependent XDH mutant was successfully created.
  • Introduction of a structural zinc atom significantly increased the thermostability of the XDH mutant.
  • The zinc-containing NADP+-dependent XDH mutant exhibited improved catalytic efficiency with NADP+.

Conclusions:

  • The engineered XDH demonstrates enhanced thermostability and catalytic activity.
  • This improved XDH holds potential for constructing efficient xylose-to-ethanol fermentation systems in yeast.
  • Further optimization could lead to advanced biofuel production strategies.