Abstract
Binding of proflavine to calf thymus DNA is investigated by differential scanning calorimetry and spectrophotometry. It is shown that proflavine interacts with DNA by three binding modes. At high DNA—ligand concentration ratios (P/D), proflavine prefers to intercalate into GC-sites but can also insert into other sites. At low P/D ratios, proflavine interacts with DNA by the external binding mode. The parameters of proflavine-DNA complexation have been calculated from spectrophotometric concentration dependences. Thermodynamic parameters of DNA melting have been calculated from differential scanning calorimetry data.
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