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Related Experiment Videos

Efficient sampling of protein sequence space for multiple mutants

R Caren1, R Mørkeberg, C Khosla

  • 1Department of Chemical Engineering, Stanford University, CA 94305-5025.

Bio/Technology (Nature Publishing Company)
|May 1, 1994
PubMed
Summary
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Recombination-enhanced mutagenesis generates vast mutant libraries by combining in vitro mutation with in vivo recombination. This powerful method aids in complex protein engineering tasks, like enzyme catalysis and antigen recognition.

Area of Science:

  • Molecular Biology
  • Biotechnology
  • Protein Engineering

Background:

  • Generating large libraries of multiple mutants is crucial for complex biological problems.
  • Existing mutagenesis methods have limitations in scalability and efficiency for complex mutant generation.

Purpose of the Study:

  • To introduce a novel method, recombination-enhanced mutagenesis, for generating large populations of multiple mutants.
  • To demonstrate the method's effectiveness in creating complex genetic variations.

Main Methods:

  • Combines in vitro mutagenesis with high-frequency in vivo recombination using single-stranded transduction systems.
  • Achieves high recombination frequencies even for mutations separated by short distances (e.g., 19 amino acids).
  • Scales mutant generation linearly with culture volume, producing up to 10^8 recombinants per ml.

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Main Results:

  • Successfully generated very large populations of multiple mutants, limited primarily by volume.
  • Demonstrated high recombination frequencies (up to 0.1) for mutations separated by >38 amino acids.
  • Applied the method to revert multiple mutants of mouse dihydrofolate reductase, which were intractable by other means.

Conclusions:

  • Recombination-enhanced mutagenesis is a powerful tool for generating extensive mutant libraries.
  • The method is well-suited for tackling combinatorially complex biological challenges.
  • Potential applications include antigen recognition, enzyme catalysis, protein folding, and membrane transport studies.