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Effects of Ionic Dependence of DNA Persistence Length on the DNA Condensation at Room Temperature
- Source :
- Communications in Theoretical Physics. 65:639-644
- Publication Year :
- 2016
- Publisher :
- IOP Publishing, 2016.
-
Abstract
- DNA persistence length is a key parameter for quantitative interpretation of the conformational properties of DNA and related to the bending rigidity of DNA. A series of experiments pointed out that, in the DNA condensation process by multivalent cations, the condensed DNA takes elongated coil or compact globule states and the population of the compact globule states increases with an increase in ionic concentration. At the same time, single molecule experiments carried out in solution with multivalent cations (such as spermidine, spermine) indicated that DNA persistence length strongly depends on the ionic concentration. In order to revolve the effects of ionic concentration dependence of persistence length on DNA condensation, a model including the ionic concentration dependence of persistence length and strong correlation of multivalent cation on DNA is provided. The autocorrelation function of the tangent vectors is found as an effective way to detect the ionic concentration dependence of toroidal conformations. With an increase in ion concentration, the first periodic oscillation contained in the autocorrelation function shifts, the number of segment contained in the first periodic oscillation decreases gradually. According to the experiments, the average long-axis length is defined to estimate the ionic concentration dependence of condensation process further. The relation between long-axis length and ionic concentration matches the experimental results qualitatively.
- Subjects :
- Persistence length
Quantitative Biology::Biomolecules
education.field_of_study
Physics and Astronomy (miscellaneous)
Chemistry
Autocorrelation
Population
Ionic bonding
02 engineering and technology
021001 nanoscience & nanotechnology
DNA condensation
01 natural sciences
Ion
chemistry.chemical_compound
Chemical physics
0103 physical sciences
Molecule
010306 general physics
0210 nano-technology
education
DNA
Subjects
Details
- ISSN :
- 02536102
- Volume :
- 65
- Database :
- OpenAIRE
- Journal :
- Communications in Theoretical Physics
- Accession number :
- edsair.doi...........1f718b9d5ad07bdc0c684cccb7ae4606