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Related Experiment Videos

On loop folding in nucleic acid hairpin-type structures.

C A Haasnoot1, C W Hilbers, G A van der Marel

  • 1Biophysical Chemistry, University of Nijmegen, The Netherlands.

Journal of Biomolecular Structure & Dynamics
|April 1, 1986
PubMed
Summary

DNA hairpins are most stable with 4-5 nucleotides in the loop, differing from RNA hairpins. This study presents a structural model explaining DNA and RNA hairpin stability based on base stacking interactions.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • RNA hairpin studies suggest maximum stability with 6-7 loop residues.
  • DNA hairpin stability has been less understood, with varying experimental observations.

Purpose of the Study:

  • To present a structural model explaining DNA hairpin stability.
  • To reconcile differences in optimal loop length between DNA and RNA hairpins.
  • To investigate the role of base stacking in nucleic acid conformation.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy
  • Optical melting experiments
  • Temperature-jump (T-jump) relaxation kinetics
  • Molecular mechanics calculations

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Main Results:

  • DNA hairpins exhibit maximum stability with 4-5 nucleotide residues in the loop.
  • RNA loop folding involves 5-6 base stacking residues on the 5'-side.
  • DNA loop folding involves 2-3 base stacking residues on the 3'-side.

Conclusions:

  • Base stacking interactions significantly determine nucleic acid conformation stability.
  • The proposed model explains the differing optimal loop lengths for DNA and RNA hairpins.
  • The model is supported by analysis of yeast tRNAPhe anticodon loop and a specific DNA hairpin structure.