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IP-FCM: Immunoprecipitation Detected by Flow Cytometry
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Improving Recombinant Antibody Production Using FcBAR: An In Situ Approach to Detect and Amplify Protein-Protein

Mina Ying Min Wu1,2, Frances Rocamora2, Mojtaba Samoudi2

  • 1Dept of Bioengineering, University of California, San Diego.

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Summary
This summary is machine-generated.

A new method, Fc-targeting Biotinylation by Antibody Recognition (FcBAR), identifies host cell proteins that impact recombinant antibody production. Overexpressing AGPAT4, EPHX1, and NSDHL significantly boosted rituximab production in CHO-S cells.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Cellular Biology

Background:

  • Recombinant proteins, especially monoclonal antibodies, are key therapeutics produced in mammalian cells.
  • Understanding host cell machinery in the protein secretion pathway is crucial for optimizing production, but remains incomplete.
  • Production failures often occur due to unknown bottlenecks in host cell protein interactions.

Purpose of the Study:

  • To develop and apply a novel method, Fc-targeting Biotinylation by Antibody Recognition (FcBAR), for *in situ* detection of protein-protein interactions (PPIs) involving Fc-domain-bearing recombinant proteins.
  • To identify host cell proteins and interactions that correlate with and influence recombinant antibody production levels.
  • To guide strategies for enhancing the production of biotherapeutics and biosimilars.

Main Methods:

  • FcBAR involves permeabilizing cells and incubating them with an anti-Fc antibody conjugated to horseradish peroxidase.
  • Interacting proteins are biotinylated, pulled down, and identified using mass spectrometry.
  • The method was applied to rituximab-producing Chinese Hamster Ovary (CHO-S) clones, combined with RNA-Seq analysis.

Main Results:

  • FcBAR successfully detected PPIs within rituximab-producing CHO-S cells.
  • Analysis revealed specific PPIs positively correlated with rituximab secretion levels.
  • Overexpression of three identified genes (AGPAT4, EPHX1, and NSDHL) significantly increased rituximab production.

Conclusions:

  • FcBAR offers an unbiased approach to measure PPIs that support recombinant antibody production *in situ*.
  • This method can identify critical host cell factors influencing biotherapeutic production.
  • Targeting identified bottlenecks through genetic manipulation can enhance the yield of biotherapeutics and biosimilars.