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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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Inducible directed evolution of complex phenotypes in bacteria.

Ibrahim S Al'Abri1, Daniel J Haller1, Zidan Li1

  • 1Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC, USA.

Nucleic Acids Research
|February 12, 2022
PubMed
Summary
This summary is machine-generated.

Directed evolution was enhanced using Inducible Directed Evolution (IDE) to engineer complex genetic pathways. This method rapidly improved microbial growth on sugars like tagatose and melezitose.

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Area of Science:

  • Synthetic Biology
  • Microbial Engineering
  • Molecular Biology

Background:

  • Directed evolution is crucial for engineering biological systems without complete sequence-function knowledge.
  • Existing methods face limitations with large DNA sequences (>5-10 kb) and complex multigene pathways, requiring large library sizes and elimination of hitchhiker mutations.

Purpose of the Study:

  • To develop a novel method, Inducible Directed Evolution (IDE), for overcoming challenges in directed evolution of complex genetic pathways.
  • To demonstrate the efficacy of IDE in improving microbial metabolic capabilities for specific sugar utilization.

Main Methods:

  • Developed IDE utilizing a temperate bacteriophage for packaging large plasmids and transferring them to naive cells post-mutagenesis.
  • Applied IDE to evolve a 5-gene pathway for tagatose catabolism in Escherichia coli.
  • Applied IDE to evolve a 15.4 kb, 10-gene pathway for melezitose utilization in Escherichia coli.

Main Results:

  • Evolved tagatose catabolism pathway clones showed a 65% reduction in lag time after two rounds of IDE.
  • Evolved melezitose utilization pathway clones exhibited over a 2-fold reduction in lag time and a 150% increase in final optical density after three rounds of IDE.
  • Demonstrated successful engineering of large, multigene pathways for enhanced substrate utilization.

Conclusions:

  • Inducible Directed Evolution (IDE) significantly enhances the capacity and utility of whole pathway directed evolution in E. coli.
  • IDE enables efficient engineering of complex phenotypes encoded by large genetic pathways.
  • This approach accelerates the development of microbial strains with improved metabolic functions.