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Related Experiment Videos

Pilus-dependent, double-stranded DNA bacteriophage for Caulobacter.

D R Scholl, J D Jollick

    Journal of Virology
    |September 1, 1980
    PubMed
    Summary

    Caulobacter phage phi 6 primarily attaches to pili, not flagella, on Caulobacter vibrioides bacteria. This pilus attachment is crucial for phage phi 6 infection, as demonstrated by studies on bacterial mutants.

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    Area of Science:

    • Microbiology
    • Virology
    • Molecular Biology

    Background:

    • Caulobacter phage phi 6 was previously thought to adsorb specifically to bacterial flagella.
    • Bacterial pili and flagella are surface appendages involved in motility and adhesion.

    Purpose of the Study:

    • To investigate the specific attachment mechanism of Caulobacter phage phi 6 to its host, Caulobacter vibrioides.
    • To determine whether pili or flagella are the primary adsorption sites for phage phi 6.

    Main Methods:

    • Comparative analysis of phage phi 6 adsorption to wild-type, pilus-less, and flagellum-less Caulobacter vibrioides mutants.
    • Characterization of phage phi 6 DNA using circular dichroism spectroscopy and thermal denaturation.
    • Morphological classification of phage phi 6.
    • Inhibition studies using treatments that affect pili and flagella.

    Main Results:

    • Phage phi 6 demonstrated significantly higher adsorption frequency to pili compared to flagella.
    • Pilus-less mutants of Caulobacter vibrioides were resistant to phage phi 6 infection, while flagellum-less mutants remained susceptible.
    • Treatments that removed or immobilized pili and flagella inhibited phage phi 6 infection.
    • Phage phi 6 contains double-stranded DNA and exhibits morphological characteristics of group B2 phages.

    Conclusions:

    • Pili, not flagella, are the primary attachment sites for Caulobacter phage phi 6 on Caulobacter vibrioides.
    • The infection mechanism of phage phi 6 is similar to other known pilus-specific phages.
    • Understanding phage-host interactions is crucial for microbial research.

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