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Related Experiment Videos

The Tn5 transposon

W S Reznikoff1

  • 1Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin-Madison 53706.

Annual Review of Microbiology
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

The bacterial transposon Tn5

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Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • The bacterial transposon Tn5 facilitates transposition via two proteins: transposase and transposition inhibitor.
  • Protein abundance influences Tn5 transposition frequency, regulated by genetic elements.
  • Host DNA methylation (dam) affects transposase and inhibitor promoter activity.

Purpose of the Study:

  • To elucidate the regulatory mechanisms governing Tn5 transposition.
  • To understand the role of protein structure and host factors in transposition.
  • To explore the timing and selective advantages of Tn5 transposition.

Main Methods:

  • Analysis of Tn5 transposase and inhibitor protein structures and functions.
  • Investigation of host protein interactions (DnaA, Dam, Fis) with Tn5.

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  • Modeling of transposition regulation and DNA replication timing.

    • Main Results:

    • The N-terminal 55 amino acids of transposase are crucial for recognizing 19-bp end DNA sequences.
    • Transposase acts in cis and inhibits its own trans activity.
    • Evidence suggests transposition preferentially occurs from newly replicated DNA.

    Conclusions:

    • Tn5 transposition is a complex process involving precise protein interactions and host factors.
    • The N-terminal domain and cis-activity are key features of the transposase.
    • Preferential transposition from replicating DNA offers a selective advantage.