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Tautomerization of Adenine Facilitated by Water:Computational Study of Microsolvation

机译:水促进腺嘌呤的互变异构化:微溶剂化的计算研究

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We present calculations for the mechanism and the barrier heights of tautomerization of adenine.We find various pathways for the 9(H) <-> 7(H) and 9(H)<-> 3(H) tautomerization.One mechanism for the 9(H) -> 7(H) tautomerization involves an sp3- or carbene-type intermediate,whereas the other proceeds via imine intermediates.Tautomerization from the 9(H) tautomer to 7(H) or 3(H) is predicted to occur with a very large activation barrier (60-70 kcal/mol),indicating that the processes may not occur readily in the gas phase.Interactions with the water molecule(s) are found to lower the barrier tremendously.We suggest that dramatic lowering of the 9(H) - 3(H) and 9(H) -> 7(H) barriers by microsolvating water molecules may facilitate the formation and observation of the 7(H) and 3(H) tautomers in the solution phase.
机译:我们对腺嘌呤互变异构的机理和势垒高度进行了计算,发现了9(H)<-> 7(H)和9(H)<-> 3(H)互变异构的各种途径。 9(H)-> 7(H)互变异构涉及sp3-或卡宾型中间体,而其他经由亚胺中间体进行。从9(H)互变异构体到7(H)或3(H)的互变异构预计会活化势垒非常大(60-70 kcal / mol),表明该过程可能在气相中不容易发生,发现与水分子的相互作用极大地降低了该势垒。通过微溶剂化水分子来分离9(H)-3(H)和9(H)-> 7(H)势垒可能有助于溶液相中7(H)和3(H)互变异构体的形成和观察。

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