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Trans catalysis in Tn5 transposition.

T A Naumann1, W S Reznikoff

  • 1Department of Biochemistry, University of Wisconsin, Madison, WI 53706, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 26, 2000
PubMed
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This study reveals how transposase proteins interact to facilitate DNA transposition. Inactive transposase mutants lead to single-ended DNA cleavage, highlighting the importance of active sites in transposition.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Transposon activity relies on synaptic complexes formed by transposase monomers binding to specific DNA sequences.
  • Transposase enzymes catalyze reactions at both ends of the transposon within these complexes.

Purpose of the Study:

  • To investigate the mechanism of Tn5 transposase in facilitating double-end cleavage and strand transfer during transposition.
  • To determine the role of catalytically active DDE motifs in Tn5 transposase function.

Main Methods:

  • In vitro transposition reactions were performed using hyperactive Tn5 transposase variants (Tnp sC7 and Tnp EK/LP) and plasmid DNA containing a transposon.
  • Reactions were repeated using catalytically inactive DDE mutant transposase versions to analyze cleavage products.

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Main Results:

  • Cooperative action of two hyperactive Tn5 transposases resulted in double-end cleavage and transposition product formation.
  • Replacing an active transposase with a DDE mutant led to single-end cleavage, producing linearized plasmids.
  • Cleavage occurred at the DNA end distal to the intact transposase active site, indicating trans action.

Conclusions:

  • The study elucidates the cooperative mechanism of Tn5 transposase in DNA transposition.
  • Active DDE motifs are crucial for facilitating both double-end cleavage and strand transfer reactions.
  • Trans-complementation by active transposase is essential for complete transposition, while inactive mutants cause incomplete cleavage.