Thermodynamic investigation of the binding of dissymmetric pyrenyl-gemini surfactants to DNA
Literature Information
Shawn D. Wettig, Rubena Deubry, Javed Akbar, Tranum Kaur, Haitang Wang, Tatiana Sheinin, Jamie W. Joseph, Roderick A. Slavcev
Gemini surfactants have demonstrated significant potential for use in constructing non-viral transfection vectors for the delivery of genes into cells to induce protein expression. Previously, two asymmetric gemini surfactants containing pyrenyl groups in one of the alkyl tails of the surfactants were synthesized as fluorescence probes for use in mechanistic studies of the transfection process. Here we present the results of a thermodynamic investigation of the binding interaction(s) between the pyrenyl-modified surfactants and DNA. The thermodynamics of the interactions have been examined using isothermal titration calorimetry, light scattering, zeta potential, and circular dichroism measurements. Distinct differences are observed between the interaction of 12-s-12 vs. the pyrene modified py-s-12 surfactants with DNA; an intercalated binding is found for the py-s-12 surfactants that disrupts the typical interactions observed between DNA and gemini surfactants.
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Physical Chemistry Chemical Physics

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