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PTO-QuickStep: A Fast and Efficient Method for Cloning Random Mutagenesis Libraries.

Pawel Jajesniak1, Kang Lan Tee2, Tuck Seng Wong3

  • 1Department of Chemical & Biological Engineering and Advanced Biomanufacturing Centre, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, UK.

International Journal of Molecular Sciences
|August 14, 2019
PubMed
Summary
This summary is machine-generated.

PTO-QuickStep simplifies DNA cloning and library creation using phosphorothioate oligos. This method enhances efficiency for synthetic biology applications like protein engineering.

Keywords:
PTO-QuickStepQuickStepcloningdirected evolutionprotein engineeringrandom mutagenesissynthetic biology

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Area of Science:

  • Molecular Biology
  • Synthetic Biology
  • Biotechnology

Background:

  • QuickStep is an established method for seamless DNA integration into plasmids.
  • Existing QuickStep protocols involve asymmetric PCRs and megaprimer amplification.
  • There is a need for simplified and more efficient cloning workflows.

Purpose of the Study:

  • To enhance the QuickStep cloning method by simplifying its workflow.
  • To improve the efficiency and accessibility of QuickStep for molecular cloning and library construction.
  • To introduce a novel approach using phosphorothioate (PTO) oligos for megaprimer generation.

Main Methods:

  • Replaced asymmetric PCRs with conventional PCR using PTO oligos to generate megaprimers with 3' overhangs.
  • Demonstrated PTO-QuickStep through direct cloning of a 1.8 kb gene fragment into a pET vector.
  • Utilized PTO-QuickStep for the creation of a random mutagenesis library for directed evolution.

Main Results:

  • PTO-QuickStep successfully enabled right-first-time cloning of a gene fragment.
  • The method efficiently generated a random mutagenesis library without pre-cloning the gene of interest.
  • PTO-QuickStep streamlines the process compared to traditional megaprimer PCR methods.

Conclusions:

  • PTO-QuickStep is a simplified, efficient, and reliable cloning technique.
  • This method expands the molecular toolbox for synthetic biology.
  • PTO-QuickStep accelerates protein engineering through directed evolution.