The effects of cytosine protonation on the thermodynamic properties of parallel pyrimidine motif DNA triplex were investigated and characterized by different techniques, such as circular dichroism (CD), ultraviolet spectroscopy (UV) and differential scanning calorimetry (DSC). A thermodynamic model was developed which, by linking the cytosine ionization equilibrium to the dissociation process of the triplex, is able to rationalize the experimental data and to reproduce the pH dependence of the free energy, enthalpy and entropy changes associated with the triplex formation. The results are useful to systematically introduce the effect of pH in a more general model able to predict the stability of DNA triplexes on the basis of the sequence alone.
Linkage of proton binding to the thermal dissociation of triple helix complex / Petraccone, Luigi; E., Erra; C. A., Mattia; V., Fedullo; Barone, Guido; Giancola, Concetta. - In: BIOPHYSICAL CHEMISTRY. - ISSN 0301-4622. - STAMPA. - 110:1-2(2004), pp. 73-81. [10.1016/j.bpc.2004.01.004]
Linkage of proton binding to the thermal dissociation of triple helix complex.
PETRACCONE, LUIGI;BARONE, GUIDO;GIANCOLA, CONCETTA
2004
Abstract
The effects of cytosine protonation on the thermodynamic properties of parallel pyrimidine motif DNA triplex were investigated and characterized by different techniques, such as circular dichroism (CD), ultraviolet spectroscopy (UV) and differential scanning calorimetry (DSC). A thermodynamic model was developed which, by linking the cytosine ionization equilibrium to the dissociation process of the triplex, is able to rationalize the experimental data and to reproduce the pH dependence of the free energy, enthalpy and entropy changes associated with the triplex formation. The results are useful to systematically introduce the effect of pH in a more general model able to predict the stability of DNA triplexes on the basis of the sequence alone.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.