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Conformational Plasticity of Parallel G-Quadruplex─Implications on Duplex-Quadruplex Motifs.

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This study reveals the dynamic flexibility of parallel DNA G-quadruplexes. Differential nucleotide flexibility and terminal dynamics are key to their function and interactions with other nucleic acid structures.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biophysics

Background:

  • DNA G-quadruplexes are crucial nucleic acid structures with diverse biological roles.
  • The parallel G-quadruplex topology is abundant and biologically significant.
  • Understanding their conformational plasticity is key to elucidating their functions.

Purpose of the Study:

  • To investigate the conformational plasticity of the parallel G-quadruplex topology.
  • To identify the factors governing nucleotide flexibility within this structure.
  • To explore the implications of this plasticity on biological interactions.

Main Methods:

  • Structure survey of parallel G-quadruplexes.
  • Solution-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Molecular dynamics (MD) simulations.

Main Results:

  • Identified distinct flexibility patterns for nucleotides based on their position in tetrad planes.
  • Correlated nucleotide flexibility with the conformational sampling of propeller loops.
  • Observed differential dynamics between 5'- and 3'-terminal nucleotides, impacting duplex accommodation.

Conclusions:

  • The conformational plasticity of parallel G-quadruplexes is finely tuned by nucleotide positioning and terminal dynamics.
  • This plasticity is critical for processes like small molecule binding and intermolecular quadruplex stacking.
  • The findings offer insights into how duplexes influence neighboring G-quadruplex structures.