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Related Experiment Videos

Transfer-deficient cointegrates of Flac and lambda prophage.

S McIntire, N Willetts

    Molecular & General Genetics : MGG
    |April 1, 1980
    PubMed
    Summary

    Researchers identified new genes involved in plasmid transfer by creating mutations in the Flac plasmid. This study clarifies the organization of transfer genes, revealing a new gene, traY, and confirming an operon structure.

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    Molecular & general genetics : MGG·1987

    Area of Science:

    • Molecular Biology
    • Genetics
    • Microbiology

    Background:

    • The plasmid Flac mediates bacterial conjugation, a process of genetic material transfer.
    • Understanding the genetic organization of plasmid transfer genes is crucial for controlling their spread.

    Purpose of the Study:

    • To identify and characterize genes involved in the transfer function of the Flac plasmid.
    • To elucidate the transcriptional organization of the Flac transfer region.

    Main Methods:

    • Induction of lambda phage insertion mutations into the Flac plasmid's transfer region.
    • Analysis of transfer-deficient mutants to identify affected tra genes.
    • Complementation tests and characterization of polar effects on gene expression.

    Main Results:

    • Twelve transfer-deficient Flac mutants were generated via lambda phage insertions.
    • Mutations identified insertions in eight different tra genes, confirming a single operon for traA-traD.
    • A novel gene, traY, was identified as the first gene in the transfer operon.
    • Evidence suggested traI is transcribed from both the operon promoter and an internal promoter.

    Conclusions:

    • The study confirms the operon structure of traA-traD genes in the Flac plasmid.
    • Identification of traY expands the known genetic map of plasmid transfer.
    • The findings provide a more detailed understanding of Flac plasmid gene regulation and organization.

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