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Related Experiment Videos

Conformational polymorphism in telomeric structures: loop orientation and interloop pairing in d(G4TnG4)

D Mohanty1, M Bansal

  • 1Molecular Biophysics Unit, Indian Institute of Science, Bangalore.

Biopolymers
|September 1, 1994
PubMed
Summary
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Telomeric G-rich sequences form complex G-quadruplex structures with thymine loops. Molecular modeling reveals how thymine arrangement influences hairpin dimer formation and stability in these crucial chromosomal regions.

Area of Science:

  • Structural Biology
  • Biophysics
  • Computational Chemistry

Background:

  • Telomeric DNA sequences are rich in guanine (G) and form unusual G-quadruplex structures.
  • These G-quadruplexes feature loops composed of thymines (T) and adenines (A), influencing DNA stability and function.
  • Understanding the structural diversity and stability of these telomeric structures is crucial for comprehending chromosome maintenance.

Purpose of the Study:

  • To investigate the structural basis of loop formation in telomeric G-quadruplexes.
  • To elucidate the different possible orientations and conformations of thymine loops.
  • To analyze the dimerization of telomeric G-quadruplex hairpins and the factors stabilizing these structures.

Main Methods:

  • Detailed molecular model building of telomeric G-rich sequences.

Related Experiment Videos

  • Molecular mechanics and energy minimization studies.
  • Analysis of loop orientations, thymine conformations, and hairpin dimer interactions.

    • Main Results:

    • A minimum of two thymines are required for loops across adjacent strands, and three for loops across diagonal strands in G-quadruplexes.
    • Telomeric G-quadruplex hairpins can dimerize in three distinct ways, with varying loop orientations and strand interactions.
    • Hairpin dimers with loops on the same side exhibit favorable thymine tetrad stacking and interloop hydrogen bonding.

    Conclusions:

    • Intervening thymine stretches stabilize folded-back G-quadruplex structures.
    • Isolated guanine stretches favor parallel G-quadruplex structures.
    • The study provides a theoretical framework for experimentally observed telomeric DNA folding preferences.