Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.2992076
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dc.titleConformational response of supercoiled DNA to confinement in a nanochannel
dc.contributor.authorLim, W.
dc.contributor.authorNg, S.Y.
dc.contributor.authorLee, C.
dc.contributor.authorFeng, Y.P.
dc.contributor.authorVan Der Maarel, J.R.C.
dc.date.accessioned2014-10-16T09:19:06Z
dc.date.available2014-10-16T09:19:06Z
dc.date.issued2008
dc.identifier.citationLim, W., Ng, S.Y., Lee, C., Feng, Y.P., Van Der Maarel, J.R.C. (2008). Conformational response of supercoiled DNA to confinement in a nanochannel. Journal of Chemical Physics 129 (16) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.2992076
dc.identifier.issn00219606
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/96067
dc.description.abstractMonte Carlo simulations were done to study the conformation of supercoiled DNA confined in a nanochannel. The molecule has a superhelical density of around -0.05 and is bathed in a monovalent salt solution with an ionic strength of 2, 10, or 150 mM. The cross-sectional diameter of the circular shaped nanochannel was varied in the range of 10 to 80 nm. The conformational properties were characterized by the writhing number and the distribution in the distance between the two opposing strands of the superhelix. With increasing confinement, as set by a smaller tube diameter and/or decreased screening of the Coulomb interaction, the supercoil becomes more tightly interwound and long-range structural features such as branching and the formation of hairpins are progressively suppressed. Analysis of the energetics shows a concurrent increase in electrostatic energy and energy of interaction of the supercoil with the wall, but the elastic twisting energy decreases. Confinement in a nanochannel or otherwise hence results in a decrease in the absolute value of the twist exerted on the duplex. The bending energy remains approximately constant, which means that there are no significant deflections from the wall. The simulation results are interpreted with theory based on the wormlike chain model, including the effects of the wall, charge, elasticity, and configurational entropy. It was found that the theory is reasonably successful in predicting the structural response to the confinement at the local level of the diameter and pitch of the supercoil. © 2008 American Institute of Physics.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1063/1.2992076
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1063/1.2992076
dc.description.sourcetitleJournal of Chemical Physics
dc.description.volume129
dc.description.issue16
dc.description.page-
dc.description.codenJCPSA
dc.identifier.isiut000260572300080
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