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• W2088097407 abstract "Combilexins are a group of DNA ligands having a sequence-specific minor groove binding element combined with an intercalating chromophore which stabilizes the DNA complex and can interfere with topoisomerases. In this study, complementary methods of spectroscopy (absorption, circular dichroism, electric linear dichroism) and biochemistry (viscometry, footprinting) have been applied to explore the nature of the complex formed between a new amsacrine-4-carboxamide−netropsin combilexin and DNA or chromatin. Collectively, the structural and kinetic data concur that the conjugate threads through the DNA double helix so as to intercalate its acridine chromophore, leaving the netropsin moiety and the methanesulfonanilino group positioned within the minor and major grooves of the double helix, respectively. The hybrid retains the AT selectivity conferred by the netropsin moiety. The threading-type intercalation process, evidenced by stopped-flow measurements, is affected when the DNA is wrapped around histones. The composite drug can bind to both the DNA linker segments and the nucleosomal cores in chromatin though, unlike its constituents, it antagonizes the salt-induced condensation of chromatin. As far as its mode of binding to DNA is concerned, the netropsin−amsacrine hybrid molecule exhibits structural features reminiscent of the antitumor antibiotics nogalamycin and pluramycin. The design of DNA-threading combilexins provides an original route for the development of sequence-specific ligands capable of forming stable complexes with DNA." @default.
• W2088097407 created "2016-06-24" @default.
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• W2088097407 date "1996-01-01" @default.
• W2088097407 modified "2023-10-01" @default.
• W2088097407 title "Interaction of a DNA-Threading Netropsin−Amsacrine Combilexin with DNA and Chromatin" @default.
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• W2088097407 doi "https://doi.org/10.1021/bi9528098" @default.
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