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Solution Structures of a G-Quadruplex Bound to Linear- and Cyclic-Dinucleotides.

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Guanine-deficit G-quadruplexes bind guanine-containing dinucleotides, like cyclic GMP-AMP (cGAMP), with micromolar affinity. This interaction involves the dinucleotide

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Cyclic dinucleotides are crucial secondary messengers regulating cellular processes.
  • Guanine-deficit G-quadruplexes, with (4n-1) guanines, exhibit unique structural properties.
  • Previous research established the formation of these guanine-deficit G-quadruplexes.

Purpose of the Study:

  • To investigate the binding of guanine-containing dinucleotides to (4n-1) G-quadruplex structures.
  • To elucidate the structural basis of this interaction using NMR spectroscopy.
  • To provide insights for designing specific ligands targeting G-quadruplexes.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was employed to solve the solution structures of complexes.
  • Two complexes were studied: a (4n-1) G-quadruplex with linear d(AG) and with cyclic cGAMP.
  • Structural analysis focused on the binding interface and hydrogen bonding interactions.

Main Results:

  • A (4n-1) G-quadruplex structure was found to bind guanine-containing dinucleotides with micromolar affinity.
  • The guanine base of the dinucleotide forms Hoogsteen hydrogen bonds with a vacant G-triad in the G-quadruplex, completing a G-tetrad.
  • Solution structures revealed specific binding interactions, with cGAMP showing strong binding to the G-triad anchor point.

Conclusions:

  • The guanine-deficit (4n-1) G-quadruplex serves as a binding site for guanine-containing dinucleotides.
  • The observed binding mechanism provides a foundation for rational ligand design for G-quadruplexes.
  • Other guanine-containing metabolites may also bind G-quadruplexes, influencing their function and metabolite expression.