Abstract
Supramolecular DNA complexes were isolated from rat normal cells and murine tumors. The content of DNA-bound lipids (cholesterol and its esters) was determined. The content of cholesterol esters is higher than that of free cholesterol; the lipid content in tumor cells is higher than in normal cells. Using the molecular mechanics approach, it is demonstrated for the first time that cholesterol and its esters with stearic, oleic, linoleic, and linolenic acids bind to the DNA minor groove more strongly than with the major groove. The calculated DNA binding energies of cholesterol and its esters depend on both the number of double bonds in the fatty acid residue and on the DNA nucleotide composition. The formation of stable complexes between cholesterol molecules and d(AT)-rich oligonucleotides was demonstrated using biological microchip containing immobilized octadeoxyribonucleotides.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 2138–2144, September, 2005.
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Zhdanov, R.I., D’yachkov, E.P., Strazhevskaya, N.B. et al. Cholesterol and its fatty acid esters in native DNA preparations: lipid analysis, computer simulation of their interaction with DNA and cholesterol binding to immobilized oligodeoxyribonucleotides. Russ Chem Bull 54, 2204–2210 (2005). https://doi.org/10.1007/s11172-006-0097-2
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DOI: https://doi.org/10.1007/s11172-006-0097-2