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Related Experiment Videos

Structure of eight streptococcal bacteriophages.

D J Moynet, A E Colon-Whitt, G B Calandra

    Virology
    |April 30, 1985
    PubMed
    Summary

    Eight streptococcal phages were analyzed for morphology and DNA structure. Most phages exhibited circular permutation and terminal repetition in their double-stranded DNA, revealing insights into phage genetics.

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    Area of Science:

    • Bacteriology
    • Virology
    • Molecular Biology

    Background:

    • Bacteriophages (phages) are viruses that infect bacteria, playing crucial roles in microbial ecology and genetics.
    • Streptococci are a genus of bacteria significant in human health, with various species causing diseases.
    • Understanding phage biology is essential for applications in phage therapy and genetic engineering.

    Purpose of the Study:

    • To characterize the morphology and nucleic acid properties of eight phages infecting different groups of streptococci.
    • To investigate the structural features of phage DNA, including its size, shape, and potential for circular permutation and terminal repetition.

    Main Methods:

    • Phage propagation in specific streptococcal hosts.
    • Purification of isolated phages.
    • Electron microscopy for morphological analysis.
    • Extraction and examination of phage nucleic acids.
    • Determination of DNA molecular weights.
    • Restriction enzyme digestion analysis.
    • BAL31 nuclease digestion and reannealing experiments to assess DNA permutation and terminal structures.

    Main Results:

    • Three distinct phage morphologies were identified via electron microscopy.
    • All eight phages contained linear double-stranded DNA (dsDNA) with molecular weights between 10.5 x 10^6 and 24 x 10^6 Daltons.
    • Four phages from three different serological groups showed identical restriction fragment patterns.
    • Six of the eight phage DNAs displayed terminal repetition.
    • All but one phage DNA demonstrated circular permutation, confirmed by BAL31 digestion and reannealing.

    Conclusions:

    • The study characterized eight streptococcal phages, revealing diverse morphologies and conserved DNA features.
    • Circular permutation and terminal repetition are common characteristics of these streptococcal phage DNAs.
    • These findings contribute to the understanding of phage genome organization and evolution within the Streptococcus genus.

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