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Nucleic Acids Res Suppl. 2002;(2):125-6.

Patassium sensing oligonucleotide, PSO, based on DNA tetraplex formation.

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Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan.


Potassium Sensing Oligonucleotide, PSO, showing a high selectivity for K+ was synthesized by connecting 6-FAM and 6-TAMRA at the 5'- and 3'-termini of d(GGG TTA GGG TTA GGG TTA GGG), respectively. Circular dichroism (CD) spectra of PSO in the absence and presence of a various amount of KCl or NaCl revealed that PSO assumes an intramolecular or intermolecular antiparallel tetraplex structure in the presence of K+ and Na+, respectively.

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