Effect of temperature on DNA condensation at single molecule level

Effect of temperature on DNA condensation at single molecule level
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温度对单分子水平 DNA 凝聚的影响

DOI:
10.1142/s0217984917501470
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发表时间:
2017-05
影响因子:
1.9
通讯作者:
周勋
周勋
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
张敏;辜凌云;范洋涛;刘艳辉;周勋

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用单分子实验方法研究了多价阳离子作用下的DNA缩合反应。为了在单分子水平上检测温度对DNA缩合的影响,建立了一个强关联模型来研究恒张力下DNA的自相互作用行为。模拟结果与DNA缩合动力学的单分子实验基本一致,无论是环状构象还是棒状构象,DNA缩合动力学都呈现出不连续的阶梯式变化。通过在强关联模型中考虑DNA持续长度对温度的依赖关系,确定了温度对DNA缩合的影响。结果表明,随着温度的升高,单分子水平上的凝聚DNA构象变得更加致密。
DNA condensation by multivalent cations has been extensively studied using single molecule experiment methods. To detect temperature effect on DNA condensation at the single molecule level, a strong correlation model was developed to investigate the behavior of DNA with self-interactions under constant tension. The simulation results are in line with the single molecule experiment that the kinetics of DNA condensation take on discontinuous and stepwise manner regardless of the toroid or rod-like conformation. By incorporating the temperature dependence of DNA persistence length into the strong correlation model, the temperature effect on DNA condensation is identified. The results indicate that condensed DNA conformations at single molecule level become more compact with increasing temperature.
DOI: 10.1021/la981159g
发表时间: 1999-03
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