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Updated: Mar 25, 2026

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
Published on: April 4, 2025
A novel pyrimidine tetrad contributing to stabilize tetramolecular G-quadruplex structures
V Esposito1, A Pepe2, R Filosa3
1Department of Pharmacy, University of Naples "Federico II", Via D. Montesano, 49, 80131 Naples, Italy. galeone@unina.it antonella.virgilio@unina.it.
Abstract:
G-quadruplex structures formed by oligodeoxyribonucleotides TGGU(NH2)GGT (AM, U(NH2) = 5-amino-2'-deoxyuridine), TGGU(Br)GGT (BR, U(Br) = 5-bromo-2'-deoxyuridine) and TGGTGGT (TH) have been investigated through circular dichroism, nuclear magnetic resonance, gel electrophoresis and molecular modeling techniques. Collected data indicate that all 7-mer oligonucleotides form tetramolecular parallel G-quadruplex structures with all residues adopting anti glycosidic bonds. In the case of AM, data suggest the occurrence of a novel U(NH2)-tetrad characterized by eight hydrogen bonds that stabilizes the G-quadruplex structure more efficiently than U(Br)- and T-tetrads.
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