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Related Experiment Video

Updated: May 30, 2026

A Protocol for Phage Display and Affinity Selection Using Recombinant Protein Baits
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Published on: February 16, 2014

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Development of an optimized cell-based selection system for phage display libraries.

Malgorzata Czarnecka1, Nicole Findik2, Anja Schlör2

  • 1Institute of Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam, Germany.

Biology Methods & Protocols
|February 19, 2025
PubMed
Summary

This study introduces a new method for discovering antibodies targeting membrane proteins using engineered cell lines. This approach improves antigen presentation for more effective antibody identification via phage display screening.

Keywords:
antibody discoverymembrane proteinsphage displayrecombinant human antibodiesselection

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Area of Science:

  • Biotechnology
  • Immunology
  • Molecular Biology

Background:

  • Phage display antibody discovery is challenged by antigen presentation, especially for complex membrane proteins.
  • Conventional methods using whole cells lead to low antigen density and high background noise.
  • Difficulties in presenting membrane proteins in their native conformation hinder antibody development.

Purpose of the Study:

  • To develop an improved method for isolating antibodies against membrane proteins in their native state.
  • To establish a high-throughput screening platform for antibody discovery using engineered cell lines.
  • To overcome limitations of traditional antigen presentation methods in phage display.

Main Methods:

  • Utilized stably transfected cell lines expressing target membrane antigens (EpCAM, NP65) regulated by EGFP.
  • Employed high-throughput flow cytometry for screening phage display libraries.
  • Optimized a screening workflow using polyclonal phage pools and characterized selected antibodies.

Main Results:

  • Successfully established a system for presenting membrane proteins at high density on cell surfaces.
  • Identified EpCAM-specific single-chain variable fragments (scFvs) from a naive library.
  • Demonstrated specific binding of recombinantly expressed EpCAM antibodies.

Conclusions:

  • The developed cell-based system offers an effective platform for antibody discovery against native membrane proteins.
  • This method enhances antigen presentation, enabling efficient isolation of specific antibodies.
  • Provides a robust strategy for generating antibodies targeting challenging membrane protein antigens.