期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 47, 期 1, 页码 68-75出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2010.03.017
关键词
Fungicide; Fluorescence quenching; Methyl thiophanate; Circular dichroism; Cyclic voltammetry; DNA binding
资金
- DNA Research Chair, King Saud University, Riyadh
Interaction of a genotoxic fungicide methyl thiophanate (MT) has been studied in vitro with calf thymus DNA. Fluorescence quenching data revealed the binding constant (K-a = 3.23 x 10(4) M-1) and binding capacity (n = 1.1) of MT with ctDNA. Ligand displacement studies using specific probes suggested the MT binding at DNA minor groove. The docking analysis further substantiated MT interaction with at least three AT base pairs within the DNA groove. A discernable change in E-0' value with decreased peak currents in cyclic voltammogram, and peak shifts in CD spectra reflected the formation of MT-ctDNA and MT-ctDNA-Cu(II) complexes. The results elucidate the significance of specific MT-DNA interactions as an initiating event in MT-induced DNA damage. (C) 2010 Elsevier B.V. All rights reserved.
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