Počet záznamů: 1  

Flavonolignan Conjugates as DNA-binding Ligands and Topoisomerase I Inhibitors: Electrochemical and Electrophoretic Approaches

  1. 1.
    0467830 - MBÚ 2017 RIV DE eng J - Článek v odborném periodiku
    Zatloukalová, M. - Vavříková, Eva - Rodrigues Pontinha, A.D. - Coufal, Jan - Křen, Vladimír - Fojta, Miroslav - Ulrichová, J. - Brett-Oliveira, A.M. - Vacek, J.
    Flavonolignan Conjugates as DNA-binding Ligands and Topoisomerase I Inhibitors: Electrochemical and Electrophoretic Approaches.
    Electroanalysis. Roč. 28, č. 11 (2016), s. 2866-2874. ISSN 1040-0397. E-ISSN 1521-4109
    Grant CEP: GA MŠMT(CZ) LD14096; GA ČR GBP206/12/G151
    Institucionální podpora: RVO:61388971 ; RVO:68081707
    Klíčová slova: flavonolignan * redox properties * nucleic acids
    Kód oboru RIV: EE - Mikrobiologie, virologie; CG - Elektrochemie (BFU-R)
    Impakt faktor: 2.851, rok: 2016

    In this work, the electrochemical behavior of flavonolignan silybin (SB) and 2,3-dehydrosilybin (DHSB) and their respective conjugates SB-SB and DHSB-DHSB were studied using voltammetric techniques at a glassy carbon electrode. The redox mechanism of SB and its conjugate occurs in two oxidation steps where the hydroxy groups of the guaiacyl and resorcinol moiety are involved. DHSB and its conjugate are oxidized in three subsequent steps. The enol group in DHSB and DHSB-DHSB is involved in the additional oxidation step, due to the enhanced electron-donor capacity and reactivity of the 2,3-dehydroderivatives compared to the parent flavonolignan molecule. The developed voltammetric methods were subsequently used for the analysis of flavonolignan-DNA interactions. Comparative experiments revealed a remarkable binding affinity between the flavonolignan homoconjugates and double-helical calf thymus DNA, compared to the corresponding monomeric compounds. In addition, biochemical and electrophoretic experiments revealed the flavonolignan-dsDNA binding not to involve intercalation as the major interaction mode. The same experiments have also shown that both flavonolignan conjugates inhibit the activity of type I topoisomerase, which is a DNA topology (superhelicity) modulating enzyme. We suppose that our results could be used in further studies focused on DNA flavonolignan binding and DNA processing protein inhibition by flavonolignan 2,3-dehydroderivatives.
    Trvalý link: http://hdl.handle.net/11104/0266204

     
     
Počet záznamů: 1  

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