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Wu, SG; Feng, D; Wu, SG (reprint author), Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610068, Peoples R China.; Wu, SG (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
Free Energy Calculation for Base Pair Dissociation in a DNA Duplex
Source PublicationACTA PHYSICO-CHIMICA SINICA
Language英语
KeywordPotential Of Mean Force Hydrogen Bond Molecular Dynamics Simulation Umbrella Sampling
AbstractDNA is the main genetic material for living organisms including many viruses. DNA duplex, coded with A=T and G=C base pairs, is well suited for biological information storage. The interactions between two bases in a base pair contribute to the stability of DNA duplex, and are further related to gene replication and transcription. In this study, we use all-atom Molecular dynamics (MD) simulations combined with Umbrella sampling (US) method to determine the free energy profiles and explore the molecular details for base pair dissociations. Four groups of DNA duplexes with different sequences have been constructed and a total of 4.3 mu s MD simulations have been carried out. In the potential of mean force (PMF) profile for G equivalent to C base pair dissociation (denoted as PMF-PGC), we observed three peaks, which correspond to the three moments G equivalent to C base pair loses its three hydrogen bonds respectively. Differently, A=T base pair loses its two hydrogen bonds within a very short time. As a result, only one hydrogen bond rupture peak was observed in its PMF curve (denoted as PMF-PAT). Compared with PMF-PAT, the overall free energy barrier in PMF-PGC is higher, which is due to the better stability of G equivalent to C than A=T. In the latter sections of both PMFs, free energies are still increasing, which is mainly resulted from the rigidity of DNA duplex backbone. We have also investigated the impact of neighboring base pairs on the stability of middle one. It is found that neighboring G equivalent to C base pairs increase the stability of A=T base pair while neighboring C equivalent to G base pairs reduce the stability of A=T base pair. Additionally, neighboring T=A base pairs have little influence on the stability of A=T base pair.
2016
Volume32Issue:5Pages:1282-1288
Subject AreaChemistry
DOIhttp://dx.doi.org/10.3866/PKU.WHXB201602185
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China [11405113] ; National Natural Science Foundation of China [11405113] ; National Natural Science Foundation of China [11405113] ; National Natural Science Foundation of China [11405113] ; Science and Technology Plan of Sichuan Province, China [2010JY0122] ; Science and Technology Plan of Sichuan Province, China [2010JY0122] ; Science and Technology Plan of Sichuan Province, China [2010JY0122] ; Science and Technology Plan of Sichuan Province, China [2010JY0122] ; Science Research Fund of Sichuan Normal University, China [10MSL02] ; Science Research Fund of Sichuan Normal University, China [10MSL02] ; Science Research Fund of Sichuan Normal University, China [10MSL02] ; Science Research Fund of Sichuan Normal University, China [10MSL02]
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/21649
Collection理论物理所科研产出_SCI论文
Corresponding AuthorWu, SG (reprint author), Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610068, Peoples R China.; Wu, SG (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Wu, SG,Feng, D,Wu, SG ,et al. Free Energy Calculation for Base Pair Dissociation in a DNA Duplex[J]. ACTA PHYSICO-CHIMICA SINICA,2016,32(5):1282-1288.
APA Wu, SG,Feng, D,Wu, SG ,&Wu, SG .(2016).Free Energy Calculation for Base Pair Dissociation in a DNA Duplex.ACTA PHYSICO-CHIMICA SINICA,32(5),1282-1288.
MLA Wu, SG,et al."Free Energy Calculation for Base Pair Dissociation in a DNA Duplex".ACTA PHYSICO-CHIMICA SINICA 32.5(2016):1282-1288.
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