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Morphology of Pasteurella multocida bacteriophages.

H W Ackermann, L Karaivanov

    Canadian Journal of Microbiology
    |September 1, 1984
    PubMed
    Summary

    This study classifies twenty-one tailed bacteriophages into four morphological types based on tail structure. These findings support the classification of these phages into distinct species within the Myoviridae, Siphoviridae, and Podoviridae families.

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    Area of Science:

    • Microbiology
    • Virology
    • Bacteriophage research

    Background:

    • Bacteriophages, viruses that infect bacteria, are diverse and classified based on morphology and genetic makeup.
    • Understanding phage morphology is crucial for taxonomy and understanding phage-bacteria interactions.
    • Previous biological data exists for some tailed phages, but comprehensive morphological classification is ongoing.

    Purpose of the Study:

    • To classify twenty-one tailed bacteriophages based on their morphological characteristics, particularly tail structure.
    • To investigate the relationship between morphology and existing biological data for these phages.
    • To propose a classification of these phages into distinct species.

    Main Methods:

    • Morphological analysis of twenty-one tailed phages using electron microscopy.
    • Classification into four distinct morphological types (AU, C-2, 32, and 22) based on tail characteristics.
    • Comparison of observed morphologies with known coliphages (e.g., P2, T7) and existing biological data.

    Main Results:

    • Twenty-one tailed phages were categorized into four morphological types belonging to the Myoviridae, Siphoviridae, and Podoviridae families.
    • Type AU (10 phages) exhibited contractile tails, resembling coliphage P2, with observed tail sheath structures.
    • Types C-2 (1 phage) and 32 (3 phages) possessed long, noncontractile tails, while Type 22 (7 phages) had short tails, similar to coliphage T7.

    Conclusions:

    • The morphological classification aligns with previous biological data, supporting distinct phage species.
    • The four identified morphological types (AU, C-2, 32, and 22) likely represent four different bacteriophage species.
    • This morphological study contributes to the taxonomic understanding of tailed bacteriophages.

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