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Related Experiment Videos

Sequence-specific DNA binding by EcoKI, a type IA DNA restriction enzyme

L M Powell1, D T Dryden, N E Murray

  • 1Institute of Cell & Molecular Biology, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3JR, UK.

Journal of Molecular Biology
|November 4, 1998
PubMed
Summary
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Type IA restriction enzymes like EcoKI bind DNA differently based on cofactors and target sites. ATP binding causes tighter target site recognition and a smaller footprint, revealing enzyme subunit roles.

Area of Science:

  • Molecular Biology
  • Enzymology
  • Prokaryotic DNA Metabolism

Background:

  • Type I DNA restriction enzymes are complex molecular machines.
  • They recognize specific DNA sequences and cleave foreign DNA.
  • Their mechanism involves DNA translocation and ATP hydrolysis.

Purpose of the Study:

  • Investigate the DNA binding affinity of EcoKI.
  • Determine the role of cofactors (ATP, S-adenosyl methionine) in EcoKI binding.
  • Characterize the exonuclease III footprint on DNA with and without target sites.

Main Methods:

  • Used oligonucleotide duplexes with and without the target sequence.
  • Assessed DNA binding affinity and exonuclease III footprints.
  • Tested the influence of ATP and S-adenosyl methionine (AdoMet) and their analogs.

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Main Results:

  • EcoKI binds DNA non-specifically and tightly without ATP, showing a large footprint (~45 bp).
  • ATP and AdoMet promote specific binding to the target site, reducing the footprint (~30 bp).
  • Partially assembled EcoKI binds the target site but not non-specifically.

Conclusions:

  • EcoKI's DNA binding involves a target recognition core and DNA cleavage subunits.
  • Cofactors regulate the interaction between cleavage subunits and DNA.
  • This regulation is crucial for DNA translocation and target site recognition.