Inosine Substitutions Demonstrate That Intramolecular DNA Quadruplexes Adopt Different Conformations in the Presence of Sodium and Potassium

Overview

Journal Bioorg Med Chem Lett

Specialty Biochemistry

Date 2005 Apr 6

PMID 15808465

Citations 23

Authors

Antonina Risitano

Keith R Fox

Affiliations

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Abstract

We have examined the stability of fluorescently-labelled oligonucleotides that are based on the human telomeric repeat [(GGGTTA)(3)GGG], in which one of the guanines in turn is substituted with inosine. We show that the relative stability of the substitutions is different in the presence of sodium and potassium. The data for potassium suggest a parallel arrangement of the strands, while the sodium form is mixed parallel and antiparallel.

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