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• W2903272752 abstract "DNA breathing is a local conformational fluctuation spontaneously occurring in double-stranded DNAs. In particular, the possibility of individual base pairs (bps) in duplex DNA to flip between alternate bp modes, i.e., Watson–Crick (WC)-like and Hoogsteen (HG)-like, at relevant time scales has impacted DNA research fields for many years. In this study, to computationally probe effects of chemical modification on the DNA breathing, we present a free energy landscape of spontaneous thermal transitions between WC and HG bps in a free DNA duplex containing N1-methylated adenine (m1A). For the current free energy computation, a variant of well-tempered metadynamics simulation was extensively performed for a total of 40 μs to produce free energy surfaces. The free energy profile indicated that, upon the chemical modification of adenine, the HG bp (m1A·T) was located in the most favorable conformation (96.7%); however, the canonical WC bp (m1A·T) was distorted into two WC-like bps of WC* (2.8%) and WC** (0.5%). The conformational exchange between these two minor WC-like bps occurs with the first hundred nanoseconds. The transition between WC-like and HG bp features multiple transition pathways displaying various extents of base flipping in combination with glycosidic rotation. Analysis of the simulated ensemble showed that the m1A-induced changes of the backbone and sugar pucker were in a reasonable agreement with previous results inferred from NMR experiments. Also, this study revealed that the formation of the stable HG bp upon the mutation alters the characteristics of dynamic fluctuations of the neighboring WC residues of m1A. We expect this simulation approach to be a robust computational scheme to complement and guide future high-resolution experiments on many outstanding issues of duplex DNA breathing." @default.
• W2903272752 created "2018-12-11" @default.
• W2903272752 creator A5031742433 @default.
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• W2903272752 date "2018-12-02" @default.
• W2903272752 modified "2023-10-14" @default.
• W2903272752 title "Computational Probing of Watson–Crick/Hoogsteen Breathing in a DNA Duplex Containing N1-Methylated Adenine" @default.
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• W2903272752 doi "https://doi.org/10.1021/acs.jctc.8b00936" @default.
• W2903272752 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30501194" @default.
• W2903272752 hasPublicationYear "2018" @default.
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