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Title: Cationic agents for DNA compaction
Authors: Gaweda, Sylwia 
Morán, M. Carmen 
Pais, Alberto A. C. C. 
Dias, Rita S. 
Schillén, Karin 
Lindman, Björn 
Miguel, M. Graça 
Keywords: DNA compaction; Coexistence; Intermediate structures; Fluorescence microscopy; Dynamic light scattering
Issue Date: 2008
Citation: Journal of Colloid and Interface Science. 323:1 (2008) 75-83
Abstract: Fluorescence microscopy was used to investigate the conformational changes of individual T4 DNA molecules induced by different compacting agents, namely the cationic surfactants, cetyltrimethylammonium bromide (CTAB) and chloride (CTAC), iron(III), lysozyme, and protamine sulfate. A protocol for establishing size estimates is suggested to obtain reproducible results. Observations show that in the presence of lysozyme and protamine sulfate, DNA molecules exhibit a conformational change from an elongated coil structure to compact globules, usually interpreted as a first-order transition. The maximum degree of compaction that is attained when iron(III) or CTAB (CTAC) are used as compacting agents is considerably smaller, and intermediate structures (less elongated coils) are visible even for high concentrations of these agents. Dynamic light scattering experiments were carried out, for some of the systems, to assess the reliability of size estimates from fluorescence microscopy.
DOI: 10.1016/j.jcis.2008.04.006
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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