Home General Physiology and Biophysics 2008 General Physiology and Biophysics Vol.27, p.271-277, 2008

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Quarterly, 80 pp. per issue
Founded: 1982
ISSN  1338-4325 (online)

Published in English

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General Physiology and Biophysics Vol.27, p.271-277, 2008

Title: A circular dichroism study of the stability of guanine quadruplexes of thrombin DNA aptamers at presence of K+ and Na+ ions
Author: Slavomíra Poniková, Marián Antalík and Tibor Hianik

Abstract: The effect of K+ and Na+ on the properties of DNA aptamers that selective binds to fibrinogen (FIBRI) and heparin (HEPA) exosites of human α-thrombin was studied by circular dichroism (CD). The complexes of FIBRI-K+ were slightly more stable than HEPA-K+. However, lower stability was observed for HEPA-K+ at presence of Na+ in comparison with FIBRI-K+. The analysis of CD melting curves suggests differences in thermal stability of both aptamers at presence of K+. The melting temperatures (Tm) and changes in van’t Hoff enthalpy for HEPA-K+ complexes were lower in comparison with those for FIBRI-K+. With increasing HEPA concentration the Tm value increased, but Tm did not change with increasing FIBRI concentration. This suggests formation of HEPA aggregates, while FIBRI aptamers are in monomeric form.

Keywords: DNA aptamers — Circular dichroism — Guanine quadruplex — Potassium — Sodium
Year: 2008, Volume: 27, Issue: 4 Page From: 271, Page To: 277

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