2′-deoxy-8-(propyn-1-yl)adenosine-containing oligonucleotides: effects on stability of duplex and quadruplex structures

-2′-Deoxy-8-(propyn-1-yl)adenosine has been incorporated in synthetic oligodeoxyribonucleotides and its influence on thermal stability of duplex and quadruplex structures investigated by UV, CD and 1H NMR. The obtained results seem to indicate that the presence of the modified base negatively affects the stability of double stranded DNA whereas remarkably increases the stability of parallel quadruplex structures.