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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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Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
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Oriented immobilization of bacteriophages for biosensor applications.

M Tolba1, O Minikh, L Y Brovko

  • 1Canadian Research Institute for Food Safety, University of Guelph, 43 McGilvray Street, Guelph, Ontario N1G 2W1, Canada.

Applied and Environmental Microbiology
|December 2, 2009
PubMed
Summary

Researchers developed a phage display method to immobilize bacteriophage T4, enabling sensitive detection of Escherichia coli B. This technique allows for rapid and specific bacterial assays using modified phages.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Bacteriophage T4 is a widely studied virus with potential applications in diagnostics.
  • Oriented immobilization of bacteriophages is crucial for developing efficient biosensors.
  • Phage display technology offers a versatile platform for protein engineering and functionalization.

Purpose of the Study:

  • To develop a method for oriented immobilization of bacteriophage T4 using phage display.
  • To engineer recombinant bacteriophages expressing specific binding ligands on their heads.
  • To evaluate the infectivity and immobilization efficiency of modified phages for bacterial detection.

Main Methods:

  • Genetic fusion of biotin carboxyl carrier protein (BCCP) or cellulose binding module (CBM) genes with the T4 small outer capsid protein (SOC) gene.
  • Expression and characterization of recombinant bacteriophages for infectivity and host range.
  • Immobilization of engineered phages onto streptavidin-coated magnetic beads and cellulose-based materials.
  • Development of a diagnostic assay using immobilized BCCP-T4 phage, phage multiplication, and real-time PCR.

Main Results:

  • Recombinant T4 phages expressing BCCP or CBM retained lytic activity and host range but showed reduced burst size and increased latent period.
  • Immobilized phages formed specific and strong bonds with solid supports (magnetic beads, cellulose).
  • The immobilized phages effectively captured and infected target bacteria.
  • An assay using immobilized BCCP-T4 phage detected as few as 800 Escherichia coli B cells within 2 hours.

Conclusions:

  • Phage display enables the oriented immobilization of bacteriophage T4 with specific binding ligands.
  • Modified bacteriophages maintain infectivity and can be effectively used for capture and detection of host bacteria.
  • The developed assay provides a rapid and sensitive method for detecting Escherichia coli B, demonstrating the potential of immobilized phages in diagnostics.