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Interlocking G-Quadruplexes Using a G-Triad•G Connection: Implications for G-Wire Assembly.

Abhishek Singh1, Fernaldo Richtia Winnerdy1, Constanza Avendaño Avila2

  • 1School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore.

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|September 14, 2024
PubMed
Summary
This summary is machine-generated.

This study reveals interlocking G-quadruplex structures, one with a vacant site and another with an extra guanine, connected via a novel G-triad-G interaction. This discovery enables self-assembling G-wires for nanotechnology.

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Area of Science:

  • Biochemistry
  • Nanotechnology
  • Structural Biology

Background:

  • G-quadruplexes are noncanonical nucleic acid structures crucial for cellular processes and nanotechnology.
  • Recent studies have uncovered novel G-quadruplex structures, including those with defects in the G-tetrad core.

Purpose of the Study:

  • To demonstrate the interlocking of two distinct intramolecular G-quadruplexes.
  • To explore the interaction mechanism between G-quadruplexes with vacant sites and unbound guanines.
  • To identify sequences capable of self-assembly into G-wires for nanotechnological applications.

Main Methods:

  • Investigating intramolecular G-quadruplexes with vacant sites (4n-1) and unbound guanines (4n+1).
  • Analyzing the G-triad-G connection and 5'-3' stacking interactions.
  • Characterizing self-assembling G-wire formation in potassium (K+) solutions.

Main Results:

  • Demonstrated the interlocking of two intramolecular G-quadruplexes through a G-triad-G linkage.
  • Observed unprecedented 5'-3' stacking in the interlocking structure.
  • Identified a specific sequence that self-assembles into G-wires in K+ solutions.

Conclusions:

  • The novel interlocking mechanism of G-quadruplexes expands our understanding of nucleic acid structures.
  • The identified G-wire-forming sequence holds promise for future nanotechnological applications.
  • This research bridges structural biology insights with potential technological advancements.