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Related Experiment Video

Updated: Jul 23, 2025

Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions
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Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions

Published on: August 30, 2024

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Stacking Interactions and Flexibility of Human Telomeric Multimers.

Benedetta Petra Rosi1, Valeria Libera1,2, Luca Bertini1

  • 1Department of Physics and Geology, University of Perugia, Via Alessandro Pascoli, 06123 Perugia, Italy.

Journal of the American Chemical Society
|July 11, 2023
PubMed
Summary

G-quadruplexes (G4s) form multimers through step-growth polymerization. Increased DNA concentration strengthens G4 stacking interactions and aggregate size, impacting drug design.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Genetics

Background:

  • G-quadruplexes (G4s) are four-stranded DNA structures implicated in cancer.
  • Current research often overlooks G4 multimerization under biological conditions.
  • G4s can self-assemble into multimers, influencing their biological roles.

Purpose of the Study:

  • To investigate the stacking interactions and structural characteristics of telomeric G4 multimers.
  • To quantitatively determine the degree of multimerization and stacking interaction strength.
  • To explore the conformational flexibility of telomeric G4 sequences and the impact of ligands.

Main Methods:

  • Utilized small-angle X-ray scattering (SAXS) combined with extremely coarse-grained (ECG) simulations.
  • Analyzed self-assembled G4 multimers to determine structural features.
  • Investigated telomeric sequences and their interactions with benchmark ligands.

Main Results:

  • G4 self-assembly results in polydisperse multimers with an exponential length distribution, indicative of step-growth polymerization.
  • Higher DNA concentrations increase G4 stacking interaction strength and aggregate size.
  • G4 units often adopt a beads-on-a-string conformation, influenced by ligand complexation.

Conclusions:

  • The study quantitatively characterizes G4 multimer formation and structural flexibility.
  • The findings reveal how DNA concentration and ligands modulate G4 multimer properties.
  • The developed methodology offers a cost-effective approach for designing G4-targeting drugs.