Abstract
Changes in secondary structure of DNA and non-histone chromosomal protein HMGB1 during the formation of the complex have been studied by circular dichroism and UV spectroscopy. It was demonstrated that the HMGB1 protein is able to change its secondary structure upon binding to DNA. Based on the assumption that there are two spectroscopically distinguishable forms of the HMGB1 in solution, we estimated the fraction of bound protein. The fraction of bound protein decreases at higher protein to DNA ratios r from 0.48 at r = 0.13 to 0.06 at r = 2.43. It was shown that HMGB1 is able to induce considerable changes in DNA structure, even when the amount of protein actually bound is low.
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Original Russian Text © A.M. Polyanichko, T.J. Rodionova, V.I. Vorob’ev, E.V. Chikhirzhina, 2011, published in Tsitologiya, Vol. 53, No. 1, 2011, pp. 55–60.
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Polyanichko, A.M., Rodionova, T.J., Vorob’ev, V.I. et al. Conformational properties of nuclear protein HMGB1 and specificity of its interaction with DNA. Cell Tiss. Biol. 5, 114–119 (2011). https://doi.org/10.1134/S1990519X1102012X
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DOI: https://doi.org/10.1134/S1990519X1102012X