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Secondary structure polymorphism in Oxytricha nova telomeric DNA.

Christoph Krafft1, James M Benevides, George J Thomas

  • 1Division of Cell Biology and Biophysics, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, MO 64110-2499, USA.

Nucleic Acids Research
|September 18, 2002
PubMed
Summary

Oxytricha nova telomeric DNA repeats form stable structures with Hoogsteen bonds. Spectroscopic analysis reveals distinct quadruplex and hairpin folds, aiding in understanding telomere-protein interactions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Telomeric DNA sequences like d(T4G4) in Oxytricha nova form stable secondary structures.
  • These structures utilize Hoogsteen hydrogen bonding and are recognized by telomere end-binding proteins.

Purpose of the Study:

  • To characterize the structural polymorphism of Oxytricha telomeric DNA repeats.
  • To differentiate between quadruplex and hairpin structures using spectroscopic methods.

Main Methods:

  • Raman spectroscopy
  • Ultraviolet Resonance Raman (UVRR) spectroscopy
  • Circular Dichroism (CD) spectroscopy
  • NMR spectroscopy (for prior context)
  • Imino NH-->ND exchange measurements

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Main Results:

  • Raman markers confirmed C2'-endo/anti and C2'-endo/syn deoxyguanosine conformations and Hoogsteen bonded guanine quartets in Oxy1.5.
  • The antiparallel quadruplex fold of Oxy1.5 was distinguished from hairpin structures (Oxy2, T6Oxy2) and single-stranded forms.
  • Novel spectral markers for thymidine and deoxyguanosine conformations were identified.

Conclusions:

  • The study provides distinct spectral signatures for various Oxytricha telomeric DNA structures.
  • These findings are valuable for investigating telomere-protein interactions in Oxytricha.
  • Structural polymorphism in telomeric DNA is crucial for biological function.