The effects of the newly synthesized covalent conjugates of water-soluble fullerene derivatives (WSFD) with xanthene dyes: polyanionic WSFD—fluorescein (1), polycationic WSFD—fluorescein (2), polyanionic WSFD—eosin (3), and polyanionic WSFD (4), polycationic WSFD (5), fluorescein (6) and eosin (7), on activity of the membrane-bound Ca2+-ATPase of the sarcoplasmic reticulum (SR Ca2+-ATPase) were studied. Compounds 1, 3, 4, 6, and 7 inhibit the hydrolytic function of the enzyme, the inhibition constants for these compounds are Ki=1.3×10—5 M (1), Ki=4.7×10—6 M (3), Ki=2.5×10—6 M (4), Ki=6.1×10—5 M (6), and Ki=5.8×10—6 M (7). The effects of compounds 3, 6, and 7 on the hydrolytic function of the enzyme is competitive; compounds 1 and 4 are noncompetitive. Polycationic WSFD fluorescein (2) and polycationic WSFD (5) do not affect ATP hydrolysis, but inhibit active Ca2+ transport in a concentration of 0.01 mM by 100±10 and 40±4%, respectively. Conjugates 1 and 3 completely inhibit the hydrolytic and transport functions of the enzyme in a concentration of 0.01 mM, and in a concentration of 0.001 mM inhibit active Ca2+ transport by 60±6 and 55±6% uncoupling the hydrolytic and transport functions of SR Ca2+-ATPases. The obtained results demonstrate a significant effect of the studied compounds on the active transmembrane transfer of Ca2+ and make it possible to predict the presence of antimetastatic and antiaggregatory activities of the studied compounds.
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Translated from Byulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 169, No. 1, pp. 96-102, January, 2020
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Tatyanenko, L.V., Pokidova, O.V., Goryachev, N.S. et al. Effects of Covalent Conjugates of Fullerene Derivatives with Xanthene Dyes on Activity of Ca2+-ATPase of the Sarcoplasmic Reticulum. Bull Exp Biol Med 169, 89–94 (2020). https://doi.org/10.1007/s10517-020-04831-8
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DOI: https://doi.org/10.1007/s10517-020-04831-8