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Protein Engineering by Yeast Surface Display
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A novel affinity protein selection system based on staphylococcal cell surface display and flow cytometry.

Nina Kronqvist1, John Löfblom, Andreas Jonsson

  • 1Department of Molecular Biotechnology, School of Biotechnology, Royal Institute of Technology (KTH), AlbaNova University Center, SE-106 91 Stockholm.

Protein Engineering, Design & Selection : PEDS
|February 2, 2008
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Summary

This study introduces a novel Gram-positive bacterial display system for selecting high-affinity proteins. Researchers successfully identified potent binders for tumor necrosis factor-alpha (TNF-alpha) using this innovative method.

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Area of Science:

  • Biotechnology
  • Protein Engineering
  • Molecular Biology

Background:

  • Affinity protein selection is crucial for therapeutic and diagnostic applications.
  • Existing methods often involve complex procedures or limitations in host systems.
  • Gram-positive bacteria offer a robust platform for surface display of recombinant proteins.

Purpose of the Study:

  • To develop and validate a novel Gram-positive bacterial display system for affinity protein selection.
  • To identify high-affinity binders against human tumor necrosis factor-alpha (TNF-alpha).
  • To demonstrate the efficacy of flow cytometry for selection and characterization in this system.

Main Methods:

  • Utilized Staphylococcus carnosus as a Gram-positive host for surface display.
  • Employed a combinatorial affibody library (3 x 10^9 variants).
  • Integrated phage display for initial enrichment, followed by three rounds of flow-cytometric sorting.
  • Conducted on-cell analysis, biosensor assays, and circular dichroism spectroscopy for characterization.

Main Results:

  • Successfully selected three novel high-affinity affibody binders for TNF-alpha.
  • Affinity ranged from 95 pM to 2.2 nM, demonstrating potent binding.
  • Established the first selection of affinity proteins using Gram-positive bacterial display.

Conclusions:

  • The developed Gram-positive bacterial display system is effective for selecting high-affinity proteins.
  • This method combines the advantages of bacterial hosts with robust protein display.
  • Flow cytometry provides a powerful tool for selection and characterization in this system.