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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
Published on: April 4, 2025
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Mass Spectroscopic Study of G-Quadruplex.
1National and Local Joint Engineering Research Center of Biomedical Functional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, People's Republic of China. huihuili@njnu.edu.cn.
Methods in Molecular Biology (Clifton, N.J.)
|August 25, 2019
Summary
Electrospray ionization mass spectrometry (ESI-MS) reveals G-quadruplex structures and ligand interactions. This sensitive method characterizes nucleic acid assemblies and binding stoichiometry from a single spectrum.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Structural Biology
Background:
- Mass spectrometry (MS) is a sensitive, accurate, and versatile analytical technique.
- G-quadruplexes are complex multistranded nucleic acid assemblies.
- Electrospray ionization mass spectrometry (ESI-MS) preserves noncovalent interactions crucial for G-quadruplex stability.
Purpose of the Study:
- To structurally characterize G-quadruplex formations in three G-rich sequences using ESI-MS.
- To investigate ligand binding interactions with G-quadruplex structures.
- To demonstrate the utility of ESI-MS for detailed analysis of nucleic acid assemblies.
Main Methods:
- Application of electrospray ionization mass spectrometry (ESI-MS).
- Analysis of G-rich sequences to form G-quadruplex structures.
- Probing G-quadruplex-ligand interactions via ESI-MS.
Main Results:
- ESI-MS successfully characterized the structural features of G-quadruplexes.
- Detailed information on cation/ligand binding stoichiometry was obtained.
- The number of strands and G-quartets within G-quadruplexes was determined from single spectra.
Conclusions:
- ESI-MS is a powerful tool for the structural characterization of G-quadruplexes.
- This method provides comprehensive insights into G-quadruplex-ligand interactions.
- A single ESI-MS spectrum can yield detailed structural and binding information.
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