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A versatile ligation-independent cloning method suitable for high-throughput expression screening applications.

Nick S Berrow1, David Alderton, Sarah Sainsbury

  • 1The Oxford Protein Production Facility, Henry Wellcome Building for Genomic Medicine, University of Oxford, Oxford, UK.

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Researchers developed a versatile In-Fusion cloning system for efficient, high-throughput protein expression screening. This ligation-independent cloning method supports large DNA fragments and multiple expression hosts, streamlining construct engineering and purification.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Protein Expression

Background:

  • Traditional cloning methods can be inefficient and time-consuming.
  • The need for versatile cloning systems for high-throughput screening is increasing.
  • Engineering recombinant proteins often requires precise control over tags and sequences.

Purpose of the Study:

  • To develop a versatile expression vector system using In-Fusion cloning.
  • To enable high-throughput cloning and expression screening.
  • To create a ligation-independent cloning system compatible with multiple hosts.

Main Methods:

  • Modification of standard expression vectors for In-Fusion compatibility.
  • Development of a ligation-independent cloning system.
  • Testing cloning efficiency across a wide range of insert concentrations.
  • Utilizing multi-host enabled vectors for screening in E. coli, HEK293T, and insect cells.

Main Results:

  • The In-Fusion based system is insert sequence independent and clones large PCR fragments efficiently.
  • The system demonstrates high efficiency over a 20-fold range of insert concentrations.
  • Precisely engineered (His(6)-) tagged constructs were generated without extraneous amino acids.
  • Rapid screening was achieved in E. coli, HEK293T, and insect cell hosts.

Conclusions:

  • The developed In-Fusion cloning system offers a versatile and efficient solution for protein expression and screening.
  • The system facilitates the precise engineering of tagged proteins and enables rapid screening across diverse hosts.
  • Automated protocols for cell transfection and protein purification were developed and validated based on this high-throughput approach.