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An experimental framework for improved selection of binding proteins using SNAP display.

Gillian Houlihan1, Pietro Gatti-Lafranconi2, Miriam Kaltenbach2

  • 1Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, UK; MedImmune Ltd, Milstein Building, Granta Park, Cambridge, CB1 6GH, UK.

Journal of Immunological Methods
|January 25, 2014
PubMed
Summary
This summary is machine-generated.

SNAP display is an in vitro DNA display technology for protein engineering. Optimizing factors like expression systems and selection stringency significantly enhances its efficiency in isolating high-affinity binders.

Keywords:
Directed evolutionIn vitro compartmentalizationIn vitro selectionProtein engineeringSNAP displayTherapeutic protein

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Protein Engineering

Background:

  • Display technologies like phage and ribosome display are crucial for selecting protein binders.
  • SNAP display is an in vitro DNA display method enabling protein expression and DNA coupling within droplets.

Purpose of the Study:

  • To investigate and quantify critical factors influencing SNAP display performance and selection efficiency.
  • To optimize SNAP display for isolating high-affinity protein binders.

Main Methods:

  • Comparison of PURExpress cell-free system with E. coli lysate for protein expression and DNA recovery.
  • Evaluation of droplet occupancy, valency, and selection stringency on recovery and enrichment.
  • Application of optimized SNAP display with bivalent display and stringent selection against Her2.

Main Results:

  • PURExpress yielded 1.5-fold more active protein and 3.5-fold greater DNA recovery than E. coli lysate.
  • Optimized SNAP display achieved 10(7)-fold enrichment of a high-affinity DARPin (H10-2-G3) against Her2.
  • SNAP display successfully resolved protein binders with nano- to picomolar affinities.

Conclusions:

  • SNAP display is a powerful in vitro tool for protein binder selection and evolution.
  • Optimized parameters significantly improve SNAP display's efficiency and resolution capabilities.
  • This study provides a framework for troubleshooting and enhancing SNAP display affinity selections.