Thermodynamics of DNA Hybridization from Atomistic Simulations

Thermodynamics of DNA Hybridization from Atomistic Simulations
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原子模拟中 DNA 杂交的热力学

DOI:
10.1021/acs.jpcb.0c09237
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发表时间:
2021
期刊:
The Journal of Physical Chemistry B
影响因子:
--
通讯作者:
Debenedetti, Pablo G.
Debenedetti, Pablo G.
中科院分区:
--
文献类型:
--
作者:
Zerze, Gül H.;Stillinger, Frank H.;Debenedetti, Pablo G.

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在原子长度尺度上研究DNA杂交平衡,无论是通过分子动力学(MD)还是通过常用的高级采样方法,都是出了名的困难。在这项工作中,我们描述了一种基于序参数的高级采样技术来计算杂交自由能,并在原子分辨率下估计DNA低聚物的熔融温度。对于Drew-Dickerson十二聚体和一系列不同GC含量的DNA十聚体序列,自由能景观被报告为基于自然拓扑的有序参数的函数。我们估计的熔化温度在±15°C内与实验值相吻合。作为对所采用方法的数值可靠性的检验,验证了德鲁-迪克森十二聚体的自由能面和熔化温度在数值精度内是不可区分的。
Studying DNA hybridization equilibrium at atomistic length scales, either via molecular dynamics (MD) or through commonly used advanced sampling approaches, is notoriously difficult. In this work, we describe an order-parameter-based advanced sampling technique to calculate the free energy of hybridization, and estimate the melting temperature of DNA oligomers at atomistic resolution. The free energy landscapes are reported as a function of a native-topology-based order parameter for the Drew–Dickerson dodecamer and for a range of DNA decamer sequences of different GC content. Our estimated melting temperatures match the experimental numbers within ±15 °C. As a test of the numerical reliability of the procedures employed, it was verified that the predicted free energy surfaces and melting temperatures of thed- andl-enantiomers of the Drew–Dickerson dodecamer were indistinguishable within numerical accuracy.
DOI: 10.1021/ct200723y
发表时间: 2012-01-10
影响因子: 5.5
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