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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Oxidation of guanine nucleotides in DNA produces 8-oxoguanine (oxoG), a significant mutagenic lesion.
  • The altered hydrogen-bonding capacity of oxoG can influence nucleic acid secondary structures, including G-quadruplexes.

Purpose of the Study:

  • To investigate the base pairing preferences of oxoG within the core of a tetrahelical G-quadruplex structure.
  • To understand how oxoG incorporation affects the structural integrity and cation binding properties of G-quadruplexes.

Main Methods:

  • Spectroscopic methods were employed to analyze the structure and properties of G-quadruplexes containing oxoG.
  • Comparative analysis of G-quadruplexes with native G-quartets versus fully substituted oxoG-quartets.

Main Results:

  • G-quartets within the G-quadruplex core can be fully substituted with oxoG nucleobases, forming an oxoG-quartet with an altered hydrogen-bonding scheme.
  • Incorporation of oxoG-quartets into the G-quadruplex core does not distort the phosphodiester backbone.
  • The central cavity of the oxoG-quadruplex exhibits larger dimensions, impacting cation localization and exchange properties.

Conclusions:

  • 8-oxoguanine can be incorporated into the core of G-quadruplex structures, forming stable oxoG-quartets.
  • While structurally tolerated, oxoG substitution modifies the cation binding environment within G-quadruplexes, potentially affecting their function and stability.