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Related Experiment Video

Updated: Sep 11, 2025

Extracellular Protein Microarray Technology for High Throughput Detection of Low Affinity Receptor-Ligand Interactions
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A multiplex extracellular interactome screening method employing high-avidity nanoparticles.

Michael A Anaya1, Maxine L Wang1, Elisa Gonzalez1

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125.

Biorxiv : the Preprint Server for Biology
|August 12, 2025
PubMed
Summary

This study introduces a new multiplex interactome assay (MPIA) for screening cell surface protein interactions. The MPIA offers greater sensitivity and dynamic range than traditional methods, enabling large-scale interactome analysis.

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Area of Science:

  • Cell biology
  • Biochemistry
  • Proteomics

Background:

  • Cell-to-cell communication relies on cell surface protein (CSP) interactions, crucial for development and disease.
  • Current screening methods struggle with low-affinity CSP interactions, leading to underrepresentation in databases.
  • Existing assays are inadequate for global interactome screening due to limitations in testing multiple interactions simultaneously.

Purpose of the Study:

  • To develop a novel multiplex method for high-throughput screening of CSP extracellular domain (ECD) interactions.
  • To overcome limitations of existing assays in detecting low-affinity interactions and enabling global interactome analysis.
  • To compare the performance of the new method against established ELISA-based assays.

Main Methods:

  • Developed a Multiplex Interactome Assay (MPIA) using dimeric CSP ECD fusion proteins.
  • Utilized nanoparticles as soluble prey and fluorescent microspheres (beads) as bait.
  • Employed a Luminex FLEXMAP 3D instrument for simultaneous detection of bait-prey binding in a multiplexed format.
  • Tested a proof-of-concept set of 41 CSPs and secreted proteins.

Main Results:

  • The MPIA demonstrated a dynamic range at least 30-fold greater than ELISA-based assays.
  • The MPIA exhibited higher sensitivity in detecting protein interactions.
  • Successfully analyzed interactions within a set of 41 CSPs and secreted proteins.

Conclusions:

  • The MPIA is a sensitive and high-dynamic-range method for screening CSP and secreted protein interactions.
  • This assay facilitates large-scale interactome analysis, addressing limitations of previous techniques.
  • Integration with automated platforms could enable comprehensive screening of thousands of human CSPs and ligands.