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Related Experiment Videos

Multiple four-stranded conformations of human telomere sequence d(CCCTAA) in solution.

K Kanaori1, N Shibayama, K Gohda

  • 1Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan. kanaori@ipc.kit.ac.jp

Nucleic Acids Research
|February 13, 2001
PubMed
Summary

Researchers discovered three distinct DNA tetramer structures in human telomeres. One novel structure, the T:-form, exhibits unique intercalation, while R-form and S:-form show different arrangements, with R-form being the most stable.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • Human telomeres, composed of repeating d(TTAGGG) sequences, are crucial for chromosome stability.
  • The d(CCCTAA) sequence is a human telomere repeating unit.
  • DNA can form non-canonical structures, such as i-motifs, under specific conditions.

Purpose of the Study:

  • To investigate the structural dynamics of the human telomere repeating unit d(CCCTAA) in a slightly acidic solution.
  • To identify and characterize distinct tetrameric structures formed by d(CCCTAA).
  • To determine the relative stability and thermodynamic properties of the identified DNA structures.

Main Methods:

  • Detailed Nuclear Magnetic Resonance (NMR) analysis of the d(CCCTAA) sequence.
  • NMR denaturation profiling to assess structural stability.

Related Experiment Videos

  • Restrained molecular dynamics calculations to model DNA structures.

    • Main Results:

    • Three distinct tetrameric structures (T:-form, R-form, S:-form) were identified, slowly exchanging in solution.
    • A novel i-motif topology, the T:-form, was characterized, featuring T4 intercalation.
    • The R-form, with C1 intercalated between C2 and C3, demonstrated the highest stability across 15-50°C.
    • Thermodynamic analysis revealed the T:-form is enthalpically driven and entropically opposed, favoring lower temperatures.

    Conclusions:

    • The human telomere repeating unit d(CCCTAA) can adopt multiple tetrameric structures in solution.
    • The relative stability of these structures is temperature-dependent.
    • Inter-strand van der Waals contacts in narrow grooves likely contribute to the enthalpic stabilization of the T:-form.