Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 13, Issue 10, Pages 4311-4317Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp02177f
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Funding
- NSF Interdisciplinary Nanotoxicity CREST Center [HRD-0833178]
- Division Of Human Resource Development [0833178] Funding Source: National Science Foundation
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In the present work, the conventional static ab initio picture of a water-assisted mechanism of the tautomerization of Nucleic Acid Bases (NABs) in an aqueous environment is enhanced by the classical and Car-Parrinello molecular dynamics simulations. The inclusion of the dynamical contribution is vital because the formation and longevity of the NAB-water bridge complexes represent decisive factors for further tautomerization. The results of both molecular dynamic techniques indicate that the longest time when such complexes exist is significantly shorter than the time required for proton transfer suggested by the static ab initio level of theory. New rate constants of tautomerization corrected for the dynamic effect of environment are proposed based on the first principles molecular dynamics data. Those values are used for the evaluation of a water-assisted mechanism that is feasible in such biological systems as E. coli cell.
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