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Author Pal, Subrata ♦ Jana, Biman ♦ Bagchi, Biman
Source IIT Gandhinagar
Content type Text
Publisher American Chemical Society
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences
Subject Keyword Atomistic molecular dynamics simulations ♦ Configurational entropy ♦ DNA duplexes ♦ Molecular Dynamics Simulation ♦ Moleculesc ♦ Specific interaction ♦ Tetrahedral ordering ♦ Thermoanalysis
Abstract Confinement and surface specific interactions can induce structures otherwise unstable at that temperature and pressure. Here we study the groove specific water dynamics in the nucleic acid sequences, poly-AT and poly-GC, in long B-DNA duplex chains by large scale atomistic molecular dynamics simulations, accompanied by thermodynamic analysis. While water dynamics in the major groove remains insensitive to the sequence differences, exactly the opposite is true for the minor groove water. Much slower water dynamics observed in the minor grooves (especially in the AT minor) can be attributed to an enhanced tetrahedral ordering ({th}) of water. The largest value of th) in the AT minor groove is related to the spine of hydration found in X-ray structure. The calculated configurational entropy (Sc) of the water molecules is found to be correlated with the self-diffusion coefficient of water in different region via Adam-Gibbs relation D = A exp(-B/TSc), and also with (th). © 2010 American Chemical Society.
ISSN 15206106
Learning Resource Type Article


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