Abstract
Aptamers interacting selectively with the anion-binding exosites 1 and 2 of thrombin were merged into dimeric oligonucleotide constructs by means of a poly-(dT)-linker of 35 nucleotides (nt) in length. Complexes of thrombin with the aptamers and their hetero- and homodimeric constructs were measured using an optical biosensor Biacore-3000. The K D values obtained for the hetero- and homodimeric constructs were correspondingly 25–30- and 2–3-fold lower than those for the primary aptamers. Analysis of temperature dependencies of the K D values within the temperature interval of 10–40°C has shown that affinity increases with the temperature decrease. The values of the enthalpy change ΔH upon formation of complexes of thrombin with the aptamers and the heterodimeric construct were basically the same. The value of the entropy change ΔS upon complex formation of thrombin with the aptamer heterodimeric construct was 1.5–2-fold higher than the ΔS values for the complexes with the aptamers. The complex formation and dissociation rates increased with the elevation of temperature from 10 to 37°C. However, at both temperatures the dissociation rate for the complex of thrombin with the heterodimeric construct was evidently lower that for the complexes with the aptamers.
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Original Russian Text © S.Yu. Rakhmetova, S.P. Radko, O.V. Gnedenko, N.V. Bodoev, A.S. Ivanov, A.I. Archakov, 2011, published in Biomeditsinskaya Khimiya.
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Rakhmetova, S.Y., Radko, S.P., Gnedenko, O.V. et al. Comparative thermodynamic analysis of thrombin interaction with anti-thrombin aptamers and their heterodimeric construct. Biochem. Moscow Suppl. Ser. B 5, 139–143 (2011). https://doi.org/10.1134/S1990750811020144
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DOI: https://doi.org/10.1134/S1990750811020144