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Plasmid hypermutation using a targeted artificial DNA replisome.

Xiao Yi1, Joleen Khey2, Romas J Kazlauskas1,3

  • 1BioTechnology Institute, University of Minnesota, Minneapolis, MN, USA. xy.sysu@gmail.com rjk@umn.edu travisan@umn.edu.

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This summary is machine-generated.

Researchers developed a targeted artificial DNA replisome (TADR) to accelerate protein evolution in vivo. This tool enhances mutation rates for specific genes, enabling faster discovery of new molecular functions and biologic catalysts.

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Area of Science:

  • Molecular Biology
  • Protein Engineering
  • Synthetic Biology

Background:

  • Exploring protein sequence space for novel functions requires large-scale in vivo evolution.
  • Disentangling target protein evolution from the broader proteome is a significant challenge.

Purpose of the Study:

  • To design a system for targeted, high-fidelity in vivo protein evolution.
  • To overcome limitations in current molecular evolution techniques.

Main Methods:

  • Engineered a targeted artificial DNA replisome (TADR) complex for live-cell plasmid replication with controlled errors.
  • Utilized TADR to selectively increase mutation rates of a target plasmid.

Main Results:

  • Achieved up to a 2.3 × 10^5-fold enhancement in target plasmid mutation rates.
  • Maintained a low 78-fold increase in off-target mutagenesis.
  • Successfully evolved TADR for increased error rate, enhanced efflux pump efficiency, and expanded substrate repertoire.

Conclusions:

  • TADR enables efficient and targeted in vivo molecular evolution.
  • Facilitates discovery of functions through simultaneous multiple substitutions, inaccessible via single substitutions.
  • Offers potential for developing novel biologic drugs and industrial catalysts.