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Tn5 transposase mutants that alter DNA binding specificity

M Zhou1, W S Reznikoff

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

Journal of Molecular Biology
|August 22, 1997
PubMed
Summary
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Researchers identified Tn5 transposase (Tnp) mutants that improve DNA transposition. These mutants enhance binding to specific DNA sequences, with some altering recognition between different DNA ends for precise genetic engineering.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Tn5 transposase (Tnp) is crucial for initiating transposition by binding to specific DNA sequences.
  • Understanding Tnp's DNA binding and recognition is key to controlling transposition for genetic applications.

Purpose of the Study:

  • To isolate and characterize Tn5 transposase (Tnp) mutants with altered DNA binding and transposition activity.
  • To investigate how specific mutations affect Tnp's recognition of different DNA ends (outside end [OE] and inside end [IE]).

Main Methods:

  • Isolation and characterization of Tn5 transposase (Tnp) mutants.
  • Assays to measure transposition frequency and Tnp-DNA binding affinity.
  • Analysis of mutant Tnp recognition specificity for OE versus IE DNA sequences.

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Main Results:

  • Four Tnp mutants (YH41, TP47, EK54, EV54) were identified that increase OE-mediated transposition and Tnp-OE DNA binding affinity.
  • Mutants TP47 and EK54 exhibit altered specificity, modifying OE and IE recognition compared to wild-type Tnp.
  • EK54 enhances OE recognition while decreasing IE recognition; TP47 enhances both but shows a stronger preference for IE when synthesized in cis.

Conclusions:

  • Specific amino acid changes in Tnp can significantly enhance transposition efficiency and alter DNA end recognition.
  • Mutant EK54's Lys54 likely interacts with OE-specific DNA sequences, while mutant TP47's Pro47 may favor IE-specific sequences.
  • A model is proposed explaining TP47 Tnp's cis-preference for IE recognition, offering insights into transposition regulation.