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

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Published on: April 1, 2016

Development of chimeric laccases by directed evolution.

Isabel Pardo1, Ana Isabel Vicente, Diana M Mate

  • 1Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain.

Biotechnology and Bioengineering
|June 26, 2012
PubMed
Summary
This summary is machine-generated.

DNA recombination created novel chimeric laccases for protein engineering. These engineered enzymes exhibit enhanced characteristics like improved pH activity and thermostability, advancing directed evolution applications.

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Identification of Functional Protein Regions Through Chimeric Protein Construction
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Area of Science:

  • Biotechnology
  • Protein Engineering
  • Molecular Biology

Background:

  • Directed evolution and DNA recombination are key for generating protein diversity.
  • Previous laboratory evolution tailored fungal laccases for expression in Saccharomyces cerevisiae.
  • Fungal laccases from Pycnoporus cinnabarinus and a PM1 basidiomycete were used.

Purpose of the Study:

  • To design chimeric laccases with high-redox potential using DNA recombination.
  • To construct and screen libraries of hybrid laccases for improved functional properties.
  • To identify laccase variants combining desirable pH activity and thermostability.

Main Methods:

  • In vitro and in vivo DNA recombination of two fungal laccase genes.
  • Family shuffling of laccase fusion genes, including evolved alpha-factor prepro-leaders for yeast secretion.
  • Dual high-throughput screening (HTS) assays to identify best laccase hybrids.
  • Analysis of chimeric sequences for multiple crossover events.

Main Results:

  • Successfully generated chimeric laccase libraries through DNA recombination and family shuffling.
  • Identified active hybrid laccases with up to six crossover events.
  • Obtained laccase chimeras exhibiting combined characteristics of parent enzymes regarding pH activity and thermostability.
  • Demonstrated the efficacy of dual HTS in identifying superior enzyme variants.

Conclusions:

  • DNA recombination is an effective strategy for creating functional protein diversity in directed evolution.
  • The developed chimeric laccases possess enhanced properties suitable for various biotechnological applications.
  • This approach facilitates the engineering of enzymes with tailored functionalities for specific industrial needs.