Biopolym. Cell. 1998; 14(1):43-46.
http://dx.doi.org/10.7124/bc.0004B7
Structure and Function of Biopolymers
Study of the quantitative characteristics of tilorone complexation with polynucleotides of various origin
1Karpov A. V., 2Khrapunov S. N., 2Sivolob A. V.
  1. D. K. Zabolotny Institute of Microbiology and Virology, NAS of Ukraine
    154, Academika Zabolotnogo Str., Kyiv, Ukraine, 03680
  2. Taras Shevchenko National University of Kyiv
    64, Volodymyrska Str., Kyiv, Ukraine, 01033

Abstract

Thermodynamic parameters of tilorone hydrochloride (dihydro-chloricle salt of 2,7-bis[2-(diethyl-amino)ethoxy]-fluoren-9-one) binding to nucleic acids are. measured spectrophotometrically. It is found that the binding constants for DNA and poly(U) are 5,3 ·105 M–1 and 4,7·104 M–1 respectively, while the binding site sizes for these polynucleotides are, respectively, about 2 bp and 1 nucleotidc. The analysis of binding isotherm for native yeast RNA shows that the binding constants for double- and single-stranded regions are 1,3-105 M–1 and 1,1·104 M–1 respectively. The fraction of double-stranded regions in the RNA is found to be 32 %, the value which are considerably higher than the value previously reported for the same RNA sample in the absence of tilorone. A tilorone high ability of stabilizing double-stranded RNA regions is suggested and biological applications of this ability, especially for interferon induction, are discussed.
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