Abstract
The process of unfolding of G-quadruplex structure in the RE31 DNA-aptamer and in its complex with thrombin under the action of the fluorescently labeled complementary oligonucleotides of varying length with formation of double-helix structures has been studied. It has been suggested that G-quadruplex unfolding involves formation of an intermediate complex with an oligonucleotide. Thermodynamic parameters and kinetics of unfolding of the free aptamer and its complex with thrombin differ. Extension of the oligonucleotide sequence complementary to G-quadruplex by two nucleotides to cover the so-called “hinge region” had little impact on the conformational transition of G-quadruplex of the free aptamer. However, a pronounced effect has been observed for the aptamer–protein complex. Most likely these differences could be explained by the thrombin-induced conformational transition of the aptamer involving the hinge region.
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Abbreviations
- 15TBA:
-
first generation DNA aptamer
- FAM:
-
6-carboxyfluorescein
- RE31:
-
second generation DNA aptamer
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V. A. Spiridonova – concept and supervision of the work, writing text of the paper; Yu. O. Naumova – conducting experiments on fluorescence measurements, processing of the results, preparation of the paper text and figures; P. A. Nikolaeva – conducting CD and SPR experiments; T. M. Novikova – preparation of aptamer complexes, sample pre-treatment; G. Ya. Kolomijtseva – supervision of the work, calculation of thermodynamic parameters and rate constants, writing text of the paper.
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Spiridonova, V.A., Naumova, Y.O., Nikolaeva, P.A. et al. Thermodynamics and Kinetics of Unfolding of Antiparallel G-Quadruplexes in Anti-Thrombin Aptamers. Biochemistry Moscow 87, 1292–1300 (2022). https://doi.org/10.1134/S0006297922110086
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DOI: https://doi.org/10.1134/S0006297922110086