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DNA Bacteriophages01:26

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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Sortase-Mediated Phage Decoration for Analytical Applications.

Yuan Ding1,2, He Chen1,2, Jiao Li1,2

  • 1College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China.

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|August 20, 2021
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Summary

This study optimized phage display to create directly labeled phage particles for immunoassays. A novel phage bioluminescent immunoassay (P-BLEIA) offers improved detection of 2,4-D herbicide.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Immunoassay Development

Background:

  • Phage display libraries yield valuable peptide/antibody fragments for immunoassays.
  • Current methods require detaching ligands from phage, risking activity loss.
  • Mild-condition labeling of phage particles remains a challenge.

Purpose of the Study:

  • To develop a method for direct labeling of phage particles for immunoassay applications.
  • To create a dual-display phage system for covalent attachment of tracer molecules.
  • To establish a phage bioluminescent immunoassay (P-BLEIA) for sensitive analyte detection.

Main Methods:

  • Engineered phage particles to express affinity binders on pIII and a sortase A-ligatable peptide on pVIII.
  • Covalently attached rhodamine and nanoluciferase (Nluc) tracers to the phage particles.
  • Developed and validated a P-BLEIA for the herbicide 2,4-D detection.

Main Results:

  • Successfully decorated phage particles with rhodamine-LPETGG and Nluc-LPETGG conjugates.
  • Achieved maximum labeling of 1238 ± 63 rhodamine and 102 ± 16 Nluc per phage.
  • P-BLEIA demonstrated a 16-fold improved limit of detection for 2,4-D compared to ELISA.
  • P-BLEIA showed high accuracy in detecting 2,4-D in spiked samples.

Conclusions:

  • The optimized dual-display phage system enables direct, efficient labeling of phage particles.
  • P-BLEIA offers a sensitive and accurate method for analyte detection, surpassing traditional phage ELISAs.
  • This approach preserves ligand activity and simplifies immunoassay reagent preparation.