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Evaluation of Drug-Nucleic Acid Interactions by Thermal Melting Curves

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If the temperature of a solution containing a helical nucleic acid is raised sufficiently, strand separation, or “melting,” occurs (1 3 ) (Fig. 1 ) (see Note 1 ) The temperature that marks the midpoint of the melting process is called the melting temperature (or T m ) (Fig. 2 ). At the T m , half of the nucleic acid exists in the helical state and the other half exists in the single-stranded state and the two species are in equilibrium (Eq. 1 ).
http://img.dxycdn.com/trademd/upload/asset/meeting/2014/02/13/B1392271713.jpg
Fig 1  Scheme descrlbing the melting process of a DN A or RN A double-helix A-T-rich regions melt first, then additional basepairs melt and unwind the helix Finally G-C-regions melt and the twist is taken up by the single-stranded regions

http://img.dxycdn.com/trademd/upload/asset/meeting/2014/02/13/B1392271711.jpg
Fig 2  The effect of increasing temperature on the 260 nm absorbance of polyd(A-T)2 The left ordinate shows normalized absorbance (—), where A norlnallzed = (A ssA t )/ (A TA h ); A ss is the absorbance for the single-stranded state (occurs at the htghest temperature),A h is the absorbance for the helical state (occurs at the lowest temperature), and A T is the absorbance at temperature T . The right ordinate shows an approxrmation of the first derivative of normalized absorbance (ΔA normalizedT , ) The temperature that marks the midpoint of the melting process is called the melting temperature (T m )

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