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Conformational and phase transitions in DNA—photosensitive surfactant solutions: Experiment and modeling
Author(s) -
Kasyanenko N.,
Lysyakova L.,
Ramazanov R.,
Nesterenko A.,
Yaroshevich I.,
Titov E.,
Alexeev G.,
Lezov A.,
Unksov I.
Publication year - 2015
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.22575
Subject(s) - chemistry , pulmonary surfactant , circular dichroism , dynamic light scattering , cationic polymerization , azobenzene , micelle , dna , phase (matter) , crystallography , chemical engineering , nanoparticle , polymer chemistry , organic chemistry , molecule , aqueous solution , biochemistry , engineering
DNA binding to trans ‐ and cis ‐isomers of azobenzene containing cationic surfactant in 5 m M NaCl solution was investigated by the methods of dynamic light scattering (DLS), low‐gradient viscometry (LGV), atomic force microscopy (AFM), circular dichroism (CD), gel electrophoresis (GE), flow birefringence (FB), UV–Vis spectrophotometry. Light‐responsive conformational transitions of DNA in complex with photosensitive surfactant, changes in DNA optical anisotropy and persistent length, phase transition of DNA into nanoparticles induced by high surfactant concentration, as well as transformation of surfactant conformation under its binding to macromolecule were studied. Computer simulations of micelles formation for cis ‐ and trans ‐isomers of azobenzene containing surfactant, as well as DNA‐surfactant interaction, were carried out. Phase diagram for DNA‐surfactant solutions was designed. The possibility to reverse the DNA packaging induced by surfactant binding with the dilution and light irradiation was shown. © 2014 Wiley Periodicals, Inc. Biopolymers 103: 109–122, 2015.