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- W2072586426 abstract "Abstract The thermodynamic model (equation 1) for formation of monomer-polymer complexes developed for better interpretation of the sigmoidal isotherms for the binding of adenosine to polyuridylic acid (2) and chemically modified polyuridylic acids (3) has been successfully applied to reproduce the isotherms for both the duplex binding of deoxyguanosine (d-G) to polycytidylic acid (at pH 6.8) and the triplex binding at pH 4.1. The value for the equilibrium constant, K, of the triplex complex (per unit of C-G-C) is ∼2000 at the optimum value of n = 5 (n is the number of d-G units in the smallest complex that can form). The value of K for the duplex complex is 555 and the optimum value of n is 4. The value of ΔG for the triple helical complex is 4.15 kcal/mole, the value of w (the stacking free energy of the d-G units in the complex) is 2.05 kcal/mole. For the double helical complex at pH 6.8, ΔG° is 3.45 kcal/mole, w = 1.55 kcal/mole. It is also shown that equation (1) predicts that the shape and mid-point slope (i.e., w) of a binding isotherm depends only on the value of n; and thus the isotherms for rA-poly U (n = 5) and dG-poly C (n = 5) have the same mid-point slopes, and thus the same values of w. The difference between ΔG° and w is taken as a relative measure of the free energy of hydrogen bonding; values are calculated for the rA-poly U, the dG-poly C triple helix, and the dG-poly C double helical complexes." @default.
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- W2072586426 date "1979-08-01" @default.
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- W2072586426 title "The binding of deoxyguanosine to polycytidylic acid: An application of the thermodynamic model of monomer-polymer complex formation" @default.
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- W2072586426 doi "https://doi.org/10.1016/0006-291x(79)92119-3" @default.
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