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Related Experiment Videos

Phage-displayed peptides as biosensor reagents.

E R Goldman1, M P Pazirandeh, J M Mauro

  • 1Georgetown University Medical Center, Department of Biochemistry and Molecular Biology, Washington, DC 20007, USA.

Journal of Molecular Recognition : JMR
|December 13, 2000
PubMed
Summary
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Phage-displayed peptides show promise as novel sensor reagents for detecting staphylococcal enterotoxin B (SEB). This study successfully isolated SEB-binding phage clones and demonstrated their use in sensitive fluorescence-based immunoassays.

Area of Science:

  • Biotechnology
  • Biosensor Technology
  • Molecular Biology

Background:

  • Staphylococcal enterotoxin B (SEB) is a significant foodborne pathogen.
  • Current detection methods for SEB can be time-consuming and complex.
  • Phage display technology offers a versatile platform for generating specific binding agents.

Purpose of the Study:

  • To explore the utility of phage-displayed peptides as reagents in biosensor applications.
  • To identify and characterize phage clones that bind specifically to staphylococcal enterotoxin B (SEB).
  • To evaluate the performance of these phage-based reagents in fluorescence-based immunoassays.

Main Methods:

  • A phage display library of random 12-mers was screened against SEB.
  • SEB-binding phage clones were isolated and their consensus sequences determined.

Related Experiment Videos

  • Competitive enzyme-linked immunosorbent assays (ELISA) were used to validate binding specificity.
  • Phage were labeled with Cy5 and incorporated into fluorescence-based immunoassays and automated sensing systems.

    • Main Results:

    • Nine distinct SEB-binding phage clones were isolated, all featuring a Trp-His-Lys consensus sequence.
    • Synthesized peptides corresponding to these clones inhibited phage binding in a competitive ELISA.
    • Cy5-labeled phage detected SEB at concentrations as low as 1.4 ng/well in fluoroimmunoassays.
    • An automated assay using labeled phage generated a robust signal, significantly outperforming a control fiber.

    Conclusions:

    • Phage-displayed peptides can serve as effective and sensitive detection reagents in biosensors.
    • The identified SEB-binding phage clones demonstrate high specificity and affinity.
    • This study validates the potential of developing phage-based sensors for rapid and accurate toxin detection.