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Microbead display by in vitro compartmentalisation: selection for binding using flow cytometry.

Armin Sepp1, Dan S Tawfik, Andrew D Griffiths

  • 1MRC Laboratory of Molecular Biology, MRC Centre, Hills Road, CB2 2QH, Cambridge, UK.

FEBS Letters
|December 17, 2002
PubMed
Summary
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Researchers linked DNA to its encoded proteins using microbeads for selection. This in vitro method efficiently enriches specific genes, enabling applications in directed evolution and bioselection.

Area of Science:

  • Biotechnology
  • Molecular Biology
  • Biochemistry

Background:

  • In vitro compartmentalisation (IVC) is a powerful technique for linking genotype and phenotype.
  • Traditional methods often require complex experimental setups or are limited in scope.

Purpose of the Study:

  • To demonstrate the utility of emulsion-based IVC for selecting proteins based on binding affinity.
  • To develop a method for enriching specific genes encoding binding proteins.

Main Methods:

  • Utilised emulsion-based in vitro compartmentalisation to physically link DNA to encoded proteins on microbeads.
  • Employed flow cytometry and cell sorting for high-throughput selection of microbeads.
  • Used polymerase chain reaction (PCR) for amplification of selected genes.

Related Experiment Videos

Main Results:

  • Achieved near-purity enrichment of haemagglutinin-encoding genes from a 10^6-fold excess of other genes.
  • Demonstrated approximately 1000-fold enrichment per round of selection.
  • Successfully isolated and amplified single genes from sorted microbeads.

Conclusions:

  • Emulsion-based IVC provides an efficient and scalable platform for in vitro protein selection based on binding.
  • This method facilitates directed evolution and the discovery of novel binding proteins.
  • The entire selection and amplification process can be performed entirely in vitro.