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Related Experiment Videos

Tn5/IS50 target recognition

I Y Goryshin1, J A Miller, Y V Kil

  • 1Department of Biochemistry, University of Wisconsin-Madison, 420 Henry Mall, Madison, WI 53706, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 2, 1998
PubMed
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Transposase protein alone determines Tn5/IS50 transposition target site selection. Analysis reveals a consensus target sequence and suggests multiple transposase interactions influence insertion site clustering and periodicity.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Transposable elements like Tn5/IS50 play crucial roles in genome evolution.
  • Understanding the mechanism of transposition, particularly target site selection, is fundamental to molecular biology.

Purpose of the Study:

  • To elucidate the factors governing Tn5/IS50 transposition target site selection.
  • To determine if transposase alone mediates target recognition.
  • To identify the sequence determinants and higher-order organizational principles of Tn5/IS50 insertion.

Main Methods:

  • Analysis of extensive Tn5 and IS50 insertion collections in small DNA regions.
  • Comparison of in vitro and in vivo transposition data.
  • Deduction of target consensus sequences from insertion sites.

Related Experiment Videos

  • Design and testing of synthetic target sequences.

    • Main Results:

    • Transposase protein alone dictates target site selection, confirmed by in vitro experiments.
    • A consensus Tn5/IS50 target sequence (A-GNTYWRANC-T) was identified.
    • Insertion sites exhibit clustering and 5-bp periodicity, suggesting cooperative binding of multiple transposase protomers.

    Conclusions:

    • Target selection is an intrinsic property of the Tn5/IS50 transposase.
    • Cooperative binding of multiple transposase protomers influences insertion site preference and organization.
    • The model of Tn5/IS50 target selection is supported by synthetic target sequence analysis.