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Related Experiment Videos

Rh(DIP)3(3+): a shape-selective metal complex which targets cruciforms.

M R Kirshenbaum1, R Tribolet, J K Barton

  • 1Department of Chemistry, Columbia University, New York 10027.

Nucleic Acids Research
|August 25, 1988
PubMed
Summary
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Rhodium(III) complex Rh(DIP)3(3+) photoactivated cleavage targets DNA cruciforms. This metal complex specifically cleaves both DNA strands at AT-rich sites near cruciform structures, aiding in DNA structure research.

Area of Science:

  • Coordination Chemistry
  • Molecular Biology
  • DNA Structure and Dynamics

Background:

  • DNA cruciforms are non-B DNA secondary structures formed at inverted repeats.
  • Understanding DNA structure recognition is crucial for developing targeted therapeutics and molecular probes.

Purpose of the Study:

  • To investigate the DNA binding and photoactivated cleavage activity of the tris(4,7-diphenylphenanthroline)rhodium(III) complex, Rh(DIP)3(3+).
  • To determine the specificity of Rh(DIP)3(3+) cleavage on DNA structures, particularly cruciforms.

Main Methods:

  • Photoactivation of Rh(DIP)3(3+) in the presence of closed circular and linear plasmid DNAs (pBR322, pColE1, phi X174).
  • DNA cleavage site mapping using S1 nuclease and high-resolution techniques.
  • Analysis of DNA binding and cleavage patterns in relation to cruciform structures.

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Main Results:

  • Rh(DIP)3(3+) binds to and cleaves both strands of DNA specifically at cruciform structures upon photoactivation.
  • Cleavage occurs at a precise AT-rich site adjacent to the stem of a minor cruciform on pBR322 DNA.
  • No cleavage or binding was observed on linear DNA lacking cruciforms, indicating structure-specific recognition.

Conclusions:

  • Rh(DIP)3(3+) is a highly specific reagent for targeting and cleaving DNA cruciforms.
  • The complex's asymmetric cleavage pattern suggests recognition of cruciform structural asymmetry.
  • This rhodium complex demonstrates the potential of shape-selective molecular recognition for probing specific DNA sites.