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Antiparallel DNA duplex formation between alternating alpha d(GA)n and beta d(GA)n sequences

B W Kalisch1, M W Germann, J H van de Sande

  • 1Department of Medical Biochemistry, Faculty of Medicine, The University of Calgary, Alta, Canada.

FEBS Letters
|June 2, 1998
PubMed
Summary

Alternating polypurine sequences form novel antiparallel DNA duplexes. This study reveals unique hairpin structures with alphaG-G and alphaA-A base pairing, expanding DNA polymorphism understanding.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Alternating purine-purine sequences, such as d(GA)n, are known for their structural polymorphism.
  • Understanding DNA secondary structures is crucial for various biological processes and therapeutic applications.

Purpose of the Study:

  • To investigate the DNA structural polymorphism of alternating polypurine sequences.
  • To characterize the formation and properties of antiparallel duplexes formed by alpha/beta chimeric oligodeoxynucleotides.

Main Methods:

  • Spectroscopic analysis
  • Electrophoretic methods
  • Thermodynamic property determination
  • T4 polynucleotide ligase assay
  • Non-denaturing gel electrophoresis

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Main Results:

  • Alpha d(GA) x d(GA) sequences form an antiparallel stranded duplex DNA at neutral pH.
  • A chimeric oligodeoxynucleotide, 5'-d(GA)4(T)4 alpha d(AG)4T-3', forms a hairpin structure with antiparallel strands.
  • This novel antiparallel hairpin exhibits distinct optical properties compared to parallel homoduplexes.
  • The hairpin structure demonstrates a high melting temperature (Tm) of 44.5°C and comparable van't Hoff enthalpy to parallel duplexes.
  • Evidence supports alphaG-G and alphaA-A base pairing within the antiparallel intramolecular duplex.

Conclusions:

  • The study confirms the formation of an antiparallel hairpin structure in alpha/beta chimeric oligodeoxynucleotides.
  • Novel homopurine base pairing interactions (alphaG-G, alphaA-A) are identified in this antiparallel DNA structure.
  • This research contributes to the understanding of d(GA)n sequence polymorphism and offers new methods for analyzing polypurine-polypyrimidine sequences.