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Related Experiment Videos

Transposase contacts with mu DNA ends.

A H Zou1, P C Leung, R M Harshey

  • 1Department of Microbiology, University of Texas, Austin 78712.

The Journal of Biological Chemistry
|October 25, 1991
PubMed
Summary

Phage Mu transposase (A protein) binds a specific 24-base pair DNA region at att sites, primarily through major groove interactions. This binding specificity is crucial for phage Mu transposition.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Phage Mu is a well-studied model for transposition.
  • Understanding transposase-DNA interactions is key to gene regulation and genome stability.

Purpose of the Study:

  • To investigate the interaction between phage Mu transposase (A protein) and Mu DNA att sites.
  • To define the DNA binding region and identify key DNA-protein contacts.

Main Methods:

  • Chemical and nuclease protection and interference studies.
  • Hydroxyl radical footprinting.
  • DNAase I hypersensitive site analysis.

Main Results:

  • A 24-base pair contact region was defined at five of six att sites.
  • Transposase binds to one face of the DNA helix, covering two major grooves.
  • Binding specificity is primarily mediated by major groove interactions, with conserved guanines playing a key role.
  • DNA bending correlates with hypersensitive sites at the back of contacted major grooves.

Conclusions:

  • Phage Mu transposase exhibits specific DNA binding at att sites, primarily via major groove contacts.
  • Conserved guanines and DNA bending are important features of transposase-att site recognition.
  • The identified contact region and binding mode provide insights into the mechanism of Mu transposition.

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