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. 1991 May 11;19(9):2309–2314. doi: 10.1093/nar/19.9.2309

Interaction between second generation anthracyclines and DNA in the nucleosomal structure.

C Cera 1, G Palù 1, S M Magno 1, M Palumbo 1
PMCID: PMC329435  PMID: 2041771

Abstract

The interaction between three anthracycline antibiotics of second generation (9-deoxydoxorubicin, 9-DAM, 4-demethoxydaunorubicin, 4-DDM, 4'-deoxydoxorubicin, 4'-DAM) and DNA in the nucleosomal structure was investigated using fluorescence and circular dichroism techniques. The thermodynamic parameters of the binding process were obtained at different ionic strength and temperature conditions, thus allowing the calculation of the electrostatic contribution to the free energy and the enthalpy of the process. The same measurements were performed on linear double stranded DNA for comparison. The parent compounds adriamycin and daunomycin were additionally considered. Although the examined drugs greatly vary in biological activity, their binding parameters are only slightly different. Like the parent compounds, 9-DAM, 4-DDM and 4'-DAM exhibit preference for isolated regions of the polynucleotide rather than for nucleosomes. This fact suggests a non-homogeneous distribution of the antibiotics in vivo. The enthalpy values are remarkably lower than the ones characterizing the interaction of adriamycin and daunomycin to DNA. According to CD spectra, all derivatives, but 4-DDM, intercalate into nucleosomal or free DNA in a manner similar to the first generation compounds, namely with the chromophore perpendicular to the hydrogen bonds between the bases. The demethoxy compound, on the other hand, seems to be able to insert its planar moiety in different orientations, which are related to the structure of the nucleic acid being examined. The lack of the methoxy group in the intercalating part of the molecule appears to be responsible for this behaviour. As far as biological activity is concerned, our findings indicate a qualitative correlation between cell cytotoxicity and ability of interaction with nucleosomes at physiological conditions, rather than with free DNA. The modified binding stereochemistry of 4-DDM could play an additive role in modulating the pharmacological effectiveness of the above compounds.

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Selected References

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