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Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers
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G-Quadruplex and Protein Binding by Single-Molecule FRET Microscopy.

Chun-Ying Lee1, Christina McNerney2, Sua Myong3

  • 1Department of Biophysics, Johns Hopkins University, Baltimore, MD, USA.

Methods in Molecular Biology (Clifton, N.J.)
|August 25, 2019
PubMed
Summary

This study details methods for analyzing G-quadruplex (G4) structures and their interactions with proteins like POT1 using single-molecule TIRF microscopy. These techniques enable the investigation of G4 folding dynamics and binding events.

Keywords:
FRETG-quadruplexG4POT1Single-moleculeTelomere

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genomics

Background:

  • G-quadruplex (G4) structures are non-canonical DNA formations crucial for genomic processes like replication and gene expression.
  • These structures are stabilized by G-tetrad stacking and monovalent cations, with their presence throughout the genome highlighting their significance.

Purpose of the Study:

  • To present methods for assessing G-quadruplex folding/unfolding dynamics.
  • To investigate the real-time interactions between G-quadruplex structures and the POT1 protein.

Main Methods:

  • Utilized single-molecule total internal reflection fluorescence (TIRF) microscopy.
  • Developed and applied protocols to monitor G-quadruplex structural transitions (folding and unfolding).
  • Quantified the dynamics of POT1 protein binding to G-quadruplex structures.

Main Results:

  • Successfully characterized the folding and unfolding kinetics of specific G-quadruplex structures.
  • Observed and analyzed the dynamic interactions between POT1 protein and G-quadruplexes at the single-molecule level.
  • Validated the utility of the presented methods for studying G4-protein interactions.

Conclusions:

  • The described single-molecule TIRF microscopy methods provide a robust platform for studying G-quadruplex dynamics.
  • These methods can be extended to explore other G-quadruplex forming sequences and their diverse protein binding partners.
  • This work contributes to understanding the functional roles of G-quadruplex structures in biological systems.