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In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity
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Published on: March 25, 2020

Versatile DNA fragmentation and directed evolution with nucleotide exchange and excision technology.

Sabine C Stebel1, Katja M Arndt, Kristian M Müller

  • 1Institut für Biologie III, Universität Freiburg, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|October 17, 2006
PubMed
Summary

This study introduces Nucleotide Exchange and Excision Technology (NExT) DNA shuffling, a novel method for optimizing DNA and protein properties. NExT DNA shuffling offers reproducible and easily executed gene fragmentation for enhanced DNA and protein evolution.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Protein Engineering

Background:

  • DNA shuffling is a common technique for optimizing DNA and protein properties by mimicking natural evolution.
  • Existing DNA shuffling methods can be complex and may lack precise control over fragment size.

Purpose of the Study:

  • To present an advancement in DNA shuffling technology called Nucleotide Exchange and Excision Technology (NExT).
  • To demonstrate a reproducible and easily executed method for generating fragmented DNA libraries for protein evolution.

Main Methods:

  • Gene libraries are amplified using polymerase chain reaction (PCR) incorporating deoxyuridine triphosphate (dUTP) alongside standard deoxynucleotide triphosphates (dNTPs).
  • Incorporated uracil bases are excised using uracil-DNA-glycosylase, followed by DNA backbone cleavage with piperidine.
  • The resulting oligonucleotide pool is reassembled using primer extension with a proofreading polymerase and amplified by PCR.

Main Results:

  • Denaturing polyacrylamide urea gels confirmed adjustable DNA fragmentation size ranges dependent on the dUTP:deoxythymidine triphosphate (dTTP) ratios.
  • Sequencing of shuffled gene libraries using PCR with 33% dUTP showed a low mutation rate (approx. 0.1%) and an average parental fragment size of 86 bases.
  • The NExT fragmentation outcome can be predicted using the NExTProg computer software.

Conclusions:

  • NExT DNA shuffling is a reproducible, easily executed, and superior alternative to existing DNA shuffling techniques.
  • This method allows for adjustable DNA fragmentation and predictable outcomes, facilitating efficient protein evolution.
  • NExT technology enhances the optimization of DNA and protein properties through controlled gene fragmentation.