Abstract
This paper presents the results of our study of the complexation of the antibiotic daunomycin with desoxytetranucleotide 5’-d(CpGpCpG) in aqueous salt solution by one- and two-dimensional (2D-TOCSY and 2D-NOESY)1H NMR spectroscopy (500 MHz). The concentration and temperature dependences of the proton chemical shifts of molecules were measured and used to calculate the equilibrium reaction constants, the relative contents of different types of complex as functions of concentration and temperature, the limiting values of the proton chemical shifts of daunomycin in various complexes, and the thermodynamic parameters of complexation δH and δS. It is concluded that the triplet nucleotide sequences are the preferable sites at which daunomycin is attached. The binding of the second daunomycin molecule to both single-stranded and duplex forms of tetramer is markedly anticooperative. This is explained by the presence in the antibiotic of a positively charged amino sugar residue creating steric hindrances for the attachment of the second antibiotic molecule to the short tetranucleotide sequence. The most plausible spatial structure of the 1:2 complex of antibiotic with desoxytetranucleotide is constructed using the calculated values of the induced proton chemical shifts of daunomycin and 2D-NOE data.
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Translated fromZhurnal Strukturnoi Khimii, Vol.40, No. 2, pp. 276–286, March–April, 1999.
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Veselkov, A.N., Eaton, R.J., Baranovskii, S.F. et al. Complexation of the antibiotic daunomycin with desoxytetraribonucleoside triphosphate 5’-d(CpGpCpG) in aqueous solution. J Struct Chem 40, 230–238 (1999). https://doi.org/10.1007/BF02903651
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DOI: https://doi.org/10.1007/BF02903651