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Structural study of four-stranded quadruplex structures containing 2'-deoxy-8-(propyn-1-yl)adenosine.

Veronica Esposito¹, Antonio Randazzo, Aldo Galeone

¹Dipartimento di Chimica delle Sostanze Naturali, Università degli Studi di Napoli 'Federico II' via D. Montesano 49, I-80131 Naples, Italy.

Bioorganic & Medicinal Chemistry

|February 26, 2004

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Modified human telomeric sequences form stable G-quadruplex structures. The propynyl modification enhances thermal stability by influencing base pairing and conformation.

Area of Science:

Structural biology
Biochemistry
Nucleic acid chemistry

Background:

G-quadruplexes are four-stranded nucleic acid structures.
The human telomeric sequence is known to form G-quadruplexes.
Modified nucleobases can alter nucleic acid structure and stability.

Purpose of the Study:

To investigate the NMR structure of G-quadruplexes formed by modified human telomeric sequences.
To understand the impact of 2'-deoxy-8-(propyn-1-yl)adenosines (Apr) on G-quadruplex formation and stability.

Main Methods:

Nuclear Magnetic Resonance (NMR) spectroscopy
Oligonucleotide synthesis
Thermal stability assays

Main Results:

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Both d(AprGGGT) and d(TAprGGGT) form 4-fold symmetric, parallel G-quadruplex structures.
Modified quadruplexes exhibit higher thermal stabilities than natural counterparts.
Propynyl groups influence 5' edge conformation, preventing a canonical A-tetrad H-bond pattern.

Conclusions:

The syn glycosidic conformation of Apr residues is likely responsible for increased thermal stability.
The modification offers a strategy to enhance G-quadruplex stability.
Structural insights into modified G-quadruplexes are provided.