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Structural analysis of Tn5.

E A Auerswald, G Ludwig, H Schaller

    Cold Spring Harbor Symposia on Quantitative Biology
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Transposon Tn5 integration involves host DNA duplication and loss via homologous sequences. Its inverted repeats may encode transposase, with sequence differences affecting gene expression and antibiotic resistance.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Microbiology

    Background:

    • Transposons are mobile genetic elements.
    • Tn5 is a well-studied transposon with inverted repeats (IR).
    • Understanding Tn5's structure and function is crucial for gene transfer studies.

    Purpose of the Study:

    • Determine the nucleotide sequences of Tn5's inverted repeats.
    • Analyze the junctions between Tn5's IR, central unique region, and host DNA.
    • Elucidate the mechanisms of Tn5 integration and loss.

    Main Methods:

    • Nucleotide sequencing of Tn5's 1.5-kb inverted repeats.
    • Analysis of DNA sequences at the junctions with host DNA.
    • Identification of open translational reading frames within the IR sequences.

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    Main Results:

    • Tn5 integration results in a 9 bp duplication of host DNA.
    • Tn5 excision occurs via crossover between short homologous sequences.
    • IR sequences contain potential transposase genes.
    • A single-base difference between IRL and IRR affects transposase reading frame and Km-resistance gene promoter efficiency.
    • The Km-resistance gene is located near the IRL terminus.

    Conclusions:

    • Tn5's IR likely originated from two identical DNA copies.
    • IRL has co-evolved with the antibiotic resistance gene.
    • Sequence variations within IR influence transposition and gene expression.