Enhanced Tetrahedral Ordering of Water Molecules in Minor Grooves of DNA: Relative Role of DNA Rigidity, Nanoconfinement, and Surface Specific Interactions

详细信息    查看全文

• 作者：Biman Jana ; Subrata Pal ; Biman Bagchi
• 刊名：Journal of Physical Chemistry B
• 出版年：2010
• 出版时间：March 18, 2010
• 年：2010
• 卷：114
• 期：10
• 页码：3633-3638
• 全文大小：249K
• 年卷期：v.114,no.10(March 18, 2010)
• ISSN：1520-5207

文摘

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 (t_h) of water. The largest value of t_h in the AT minor groove is related to the spine of hydration found in X-ray structure. The calculated configurational entropy (S_C) 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/TS_C), and also with t_h.