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Parallel and antiparallel G-DNA structures from a complex telomeric sequence

E A Venczel1, D Sen

  • 1Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada.

Biochemistry
|June 22, 1993
PubMed
Summary
This summary is machine-generated.

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Cations influence the formation of parallel (G4) and antiparallel (G'2) DNA structures. The thymine-guanine core in Saccharomyces telomeric DNA is crucial for stabilizing G4 structures, revealing novel G-DNA arrangements.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Telomeric DNA sequences form higher-order structures, including G-quadruplexes (G4), which are crucial for genome stability.
  • The Saccharomyces telomeric motif TGTG3TGTGTGTG3 is more complex than those from protozoa, suggesting unique structural properties.
  • Cation type significantly influences the folding pathways and final structures of G-DNA.

Purpose of the Study:

  • To elucidate the role of different cations (Group Ia and IIa) in directing the formation of parallel-stranded (G4, G8) versus antiparallel (G'2) G-DNA structures.
  • To investigate the specific structural features of G-DNA formed by the complex Saccharomyces telomeric sequence.
  • To understand the contribution of the thymine-guanine (T-G) core to the stabilization of these G-DNA structures.

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Main Methods:

  • In vitro formation of higher-order DNA structures using a synthetic Saccharomyces telomeric oligomer.
  • Cation-dependency studies using various alkali (Li+, Cs+) and alkaline earth (Mg2+, Ba2+) metal ions.
  • Dimethyl sulfate and potassium permanganate protection/interference experiments to probe DNA structure.
  • Analysis of temperature-dependent structural transitions.

Main Results:

  • Dramatic switches between G4 and G'2 structure formation were observed with different cations (Li+-Cs+, Mg2+-Ba2+).
  • Kinetic control, as proposed by Sen and Gilbert (1990), explains the accumulation of G'2 structures in K+ and Sr2+ solutions at the expense of thermodynamically stable G4 structures.
  • The T-G core within the telomeric motif is critical for stabilizing the parallel G4 structure but not the antiparallel G'2 structure.
  • Novel structural features were identified in both G4 and G'2 complexes, including a potential higher-order arrangement of T-G quartets in the G4 structure.

Conclusions:

  • Cation choice profoundly impacts G-DNA folding pathways and the resulting parallel versus antiparallel structures.
  • The T-G core plays a key role in stabilizing parallel G4 structures through unique quartet arrangements.
  • The findings support kinetic models for G-DNA formation and highlight the structural diversity of telomeric G-DNA.