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Probing Surface Membrane Receptors Using Engineered Bacteriophage Bioconjugates.

Yakov A Lomakin1,2, Alena N Kaminskaya1, Alexey V Stepanov1,2

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Researchers developed a new platform combining phage display and flow cytometry to visualize and select cells based on surface receptor specificity. This method offers high selectivity for identifying specific cell-ligand interactions, aiding biological studies and drug discovery.

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Area of Science:

  • Biotechnology
  • Cell Biology
  • Molecular Biology

Background:

  • Specific recognition of ligands by cell surface receptors is crucial for cellular communication and environmental sensing.
  • Understanding these interactions is vital for basic research and therapeutic development.

Purpose of the Study:

  • To design a high-throughput platform for visualizing and selecting eukaryotic cells based on surface receptor specificity.
  • To integrate phage display and flow cytometry for enhanced cell-receptor interaction analysis.

Main Methods:

  • Engineered M13K07 bacteriophages displaying polypeptide ligands for specific membrane receptors.
  • Intracellular biotinylation of phage for subsequent streptavidin-PE-Cy7 labeling.
  • Interaction analysis with transgenic B-cells expressing single-chain B-cell receptors.

Main Results:

  • Achieved 97% selectivity and 2.0% false-positive detection in identifying specific cell-ligand interactions.
  • Demonstrated superior specificity and sensitivity with phage bioconjugates compared to synthetic peptides.
  • Required phage bioconjugate concentrations were three orders of magnitude lower.

Conclusions:

  • The developed platform enables precise visualization and selection of cells based on surface receptor interactions.
  • This technology can be applied for routine cell staining and characterization of orphan membrane receptors.
  • The method enhances the study of cell-surface interactions in mammalian cells within their native environment.