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Intramolecular DNA triplexes in supercoiled plasmids.

J C Hanvey1, M Shimizu, R D Wells

  • 1Department of Biochemistry, School of Medicine, University of Alabama, Birmingham 35294.

Proceedings of the National Academy of Sciences of the United States of America
|September 1, 1988
PubMed
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This study provides evidence for an unusual DNA structure called an intramolecular triplex. Base pair changes in mirror repeat sequences demonstrated the existence and stability of this complex DNA formation.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Oligopurine.oligopyrimidine mirror repeats are DNA sequences with potential for non-canonical structures.
  • Intramolecular triplexes represent a unique DNA conformation with potential biological significance.

Purpose of the Study:

  • To investigate the in vitro existence of intramolecular triplexes in specific DNA sequences.
  • To evaluate the structural integrity and chemical reactivity of these triplexes at the base pair level.

Main Methods:

  • Utilized chemical probes (OsO4 and diethylpyrocarbonate) to assess base pair interactions.
  • Analyzed parent and mutant DNA inserts within recombinant plasmids.
  • Examined thermal stability of the DNA complexes.

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Main Results:

  • Chemical reactivity was altered 13 base pairs away from specific base pair changes in mirror repeat sequences.
  • Demonstrated direct evidence for triplex formation involving Hoogsteen base-pairing.
  • Confirmed the stability of the triplex structure under experimental conditions.

Conclusions:

  • The study confirms the in vitro existence of intramolecular triplexes formed by oligopurine.oligopyrimidine mirror repeats.
  • Unorthodox DNA structures like these may have significant biological implications.
  • Base pair alterations can influence the stability and reactivity of these complex DNA formations.