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[Plasmids of Yersinia pseudotuberculosis].

V A Shmelev, E A Novikov

    Molekuliarnaia Genetika, Mikrobiologiia I Virusologiia
    |February 1, 1990
    PubMed
    Summary

    Researchers characterized Yersinia pseudotuberculosis plasmids, finding sizes from 5.7 to 130 kb. A 70-77 kb plasmid showed similarity to Yersinia pestis virulence plasmids.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Plasmids are extrachromosomal DNA elements crucial for bacterial adaptation and virulence.
    • Yersinia species possess diverse plasmids that influence their pathogenicity.
    • Understanding plasmid diversity in Yersinia pseudotuberculosis is essential for comprehending its biology.

    Purpose of the Study:

    • To identify and characterize plasmids present in Yersinia pseudotuberculosis strains.
    • To compare identified plasmids with known virulence plasmids from related species, such as Yersinia pestis.
    • To investigate the genetic makeup and potential functional relevance of these plasmids.

    Main Methods:

    • Plasmid DNA isolation from Yersinia pseudotuberculosis strains.
    • Restriction endonuclease digestion and analysis.
    • Southern-blot hybridization for homology detection.
    • Physical map construction for characterized plasmids.

    Main Results:

    • Four distinct plasmid size classes were identified: 5.7 kb, 51 kb, 70-77 kb, and 120-130 kb.
    • The 70-77 kb plasmids exhibited homology to the calcium-dependence plasmid pYVO19 of Yersinia pestis EV76, with variations due to insertions/deletions.
    • The 51 kb plasmid showed no homology to known virulence plasmids and did not confer virulence traits.
    • The 5.7 kb plasmid lacked homology to the Yersinia pestis 10 kb plasmid, but its replicon was utilized in constructing the pVS11 vector.

    Conclusions:

    • Yersinia pseudotuberculosis harbors a variety of plasmids, some of which share characteristics with virulence factors of other Yersinia species.
    • Plasmid characterization provides insights into the genetic potential and evolutionary relationships within the Yersinia genus.
    • The 5.7 kb plasmid's replicon offers a valuable tool for molecular biology applications, such as vector construction.

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