Ethidium cooperativity in the formation of complexes with CpG |
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| Authors: | M Day C G Trowbridge |
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| Affiliation: | 1. Researcher, Thushara, Neethinagar-64, Kollam, Kerala, India;2. Department of Organic and Bioorganic Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, 500 05 Hradec Králové, Czech Republic;3. Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125 Modena, Italy;1. Department of Physics, Fatima Mata National College (Autonomous), Kollam, Kerala, India;2. Department of Organic and Bioorganic Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, 500 05 Hradec Králové, Czech Republic;3. Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125 Modena, Italy |
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| Abstract: | The formation of complexes between the self-complementary ribo-dinucleoside monophosphate CpG and ethidium ion is observed by use of an ethidium ion selective electrode. The ratio of total CpG to total ethidium was varied from 50:1 to .4:1, with CpG concentrations ranging from 0.2 to 1.1 mM. Scatchard plots show that the system is strongly cooperative with respect to ethidium ion; cooperativity with respect to dinucleoside has been previously reported (Krugh, T.R., Wittlin, F.N., and Cramer, S.P. (1975) Biopolymers 14,197-210). Cooperative behavior with respect to ethidium ion implies the existence of complexes containing at least two molecules of ethidium ion in combination with one or more CpG molecules. |
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