Liquid crystalline phase behavior of high molecular weight DNA: A comparative study of the influence of metal ions of different size, charge and binding mode

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dc.contributor.authorSundaresan, N
dc.contributor.authorSuresh, CH
dc.contributor.authorThomas, T
dc.contributor.authorThomas, TJ
dc.contributor.authorPillai, CKS
dc.date.accessioned2017-03-10T03:27:27Z
dc.date.available2017-03-10T03:27:27Z
dc.date.issued2008
dc.description.abstractThe ability of Li+, Na+, K+, Rb+, CS+, Mg2+, Ca2+, Sr2+, Ba2+, Cu2+, Cd2+, Al3+, V4+, Hg2+, Pd2+, Au3+, and Pt4+ to provoke liquid crystalline (LC) phases in high molecular weight DNA was investigated. The alkali and alkaline earth metal ions provoked typical cholesteric/columnar structures, whereas transition metal ions precipitated DNA into solid/translucent gel-like aggregates. Heavy metal ions reduced viscosity of DNA solution, disrupting rigid, rod-like DNA structure necessary for LC textures. Three-layer quantum mechanical-molecular mechanical (QM/MM) studies of Li+, Na+, K+, Mg2+, and Ca2+ binding DNA fragment suggested several possible binding modes of these ions to the phosphate groups. The dianion mode of metal binding, involving the phosphate groups of both strands of DNA, allowed for higher DNA binding affinity of the alkaline earth metal ions. These results have implications in understanding the biological role of metal ions and developing DNA-based sensors and nanoelectronic devices.
dc.identifier.citation9 ,7;1860-1869en_US
dc.identifier.uri10.1021/bm800101x
dc.identifier.urihttps://dspace.sctimst.ac.in/handle/123456789/10003
dc.publisherBIOMACROMOLECULES
dc.subjectBiochemistry & Molecular Biology; Chemistry; Polymer Science
dc.titleLiquid crystalline phase behavior of high molecular weight DNA: A comparative study of the influence of metal ions of different size, charge and binding mode
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