Structural correlations and melting of B-DNA fibres

Details Structural correlations and melting of B-DNA fibres Structural correlations and melting of B-DNA fibres

2011-06-14

arxiv.org/abs/1106.2632v1

Physical Review E: Statistical, Nonlinear, and Soft Matter Physics (2011)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

Despite numerous attempts, the understanding of the thermal denaturation of DNA is still a challenge due to the lack of structural data at the transition since standard experimental approaches to DNA melting are made in solution and do not provide spatial information. We report a measurement using neutron scattering from oriented DNA fibres to determine the size of the regions that stay in the double-helix conformation as the melting temperature is approached from below. A Bragg peak from the B-form of DNA has been observed as a function of temperature and its width and integrated intensity have bean measured. These results, complemented by a differential calorimetry study of the melting of B DNA fibres as well as electrophoresis and optical observation data, are analysed in terms of a one-dimensional mesoscopic model of DNA.

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