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Article Dans Une Revue EPL - Europhysics Letters Année : 2010

Confinement-induced phase transition in a DNA-lipid hydrated complex

Résumé

We study the effect of the soft confinement by fluid lipid bilayers on the spatial organisation of DNA molecules in a DNA-zwitterionic lipid hydrated lamellar complex. The confinement is increased by dehydrating the complex in a controlled way, which leads to a decrease of the water channel thickness separating the periodically stacked bilayers. Using grazing-incidence small-angle X-ray scattering on an oriented thin film, we probe in situ as dehydration proceeds the structure of the DNA-lipid complex. A structural phase transition is evidenced, where an apparently disordered phase of DNA rods embedded within the one-dimensionally ordered lipid lamellar phase observed at high hydration is replaced by a 2D hexagonal structure of DNA molecules intercalated between the lipid bilayers.
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Dates et versions

hal-00527747 , version 1 (20-10-2010)

Identifiants

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E. Andreoli de Oliveira, E.R. Teixeira da Silva, A. Février, E. Grelet, F. Nallet, et al.. Confinement-induced phase transition in a DNA-lipid hydrated complex. EPL - Europhysics Letters, 2010, 91 (2), pp.28001. ⟨10.1209/0295-5075/91/28001⟩. ⟨hal-00527747⟩

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