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Visualizing transient Watson-Crick-like mispairs in DNA and RNA duplexes.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Rare tautomeric and anionic nucleobases are hypothesized to have crucial biological functions.
  • Their transient nature, low abundance, and proton dynamics have hindered investigation into their prevalence and importance.

Purpose of the Study:

  • To investigate the dynamic equilibrium of wobble mispairs in DNA and RNA.
  • To determine the role of rare nucleobases in stabilizing these mispairs and their potential biological implications.

Main Methods:

  • Utilized Nuclear Magnetic Resonance (NMR) relaxation dispersion techniques.
  • Analyzed dynamic equilibrium between wobble (dG•dT, rG•rU) and Watson-Crick-like mispairs in nucleic acid duplexes.

Main Results:

  • Demonstrated that wobble mispairs dynamically equilibrate with short-lived, low-population Watson-Crick-like mispairs.
  • Showed stabilization of these mispairs by rare enolic or anionic bases.
  • Quantified mispair formation probabilities (10^-3 to 10^-5), suggesting a universal role in genetic errors.

Conclusions:

  • Rare tautomeric and anionic bases are widespread in nucleic acids.
  • These bases significantly expand the structural and functional complexity of DNA and RNA beyond canonical bases.
  • The identified mispairs can bypass Watson-Crick fidelity checkpoints, implying a role in biological errors.