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Structural studies of a trinucleotide repeat sequence using 2-aminopurine.

Natalya N Degtyareva1, Michael J Reddish, Bidisha Sengupta

  • 1Department of Chemistry, Furman University, Greenville, South Carolina 29613, USA.

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|January 28, 2009
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Modified (CAG)(8) DNA hairpins, implicated in neurodegenerative diseases, maintain their structure. Increased solvent exposure near the loop indicates instability, providing insights into related DNA structures.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • Repeated trinucleotide sequences, such as (CAG)(8), form secondary structures like hairpins.
  • These structures are associated with the pathogenesis of several neurodegenerative diseases.
  • Understanding the structural and thermodynamic properties of these hairpins is crucial for disease mechanism insights.

Purpose of the Study:

  • To assess the structural and thermodynamic properties of the (CAG)(8) hairpin.
  • To investigate the impact of 2-aminopurine substitutions on hairpin stability and local structure.
  • To correlate local structural changes with global secondary structure and potential disease mechanisms.

Main Methods:

  • Synthesis of (CAG)(8) sequences with 2-aminopurine substitutions at six adenine positions.
  • Circular dichroism (CD) spectroscopy to assess overall secondary structure.
  • Thermal denaturation experiments to determine thermodynamic stability.
  • Fluorescence spectroscopy of 2-aminopurine to monitor local structure and solvent accessibility.
  • Acrylamide quenching to assess base exposure.

Main Results:

  • 2-aminopurine substitutions did not significantly disturb the secondary structure or thermal stability of the (CAG)(8) hairpin.
  • Fluorescence intensity changes and acrylamide quenching revealed increased solvent exposure of bases near the hairpin loop.
  • These local structural changes suggest an influence on the global secondary structure and potential instability.

Conclusions:

  • The (CAG)(8) hairpin's secondary structure is robust to specific base modifications.
  • Increased solvent exposure near the loop is a key characteristic, potentially linked to hairpin instability.
  • These findings provide a foundation for interpreting the structures and functions of other CAG repeat sequences in disease contexts.