Theoretical Study on the Relative Energies of Neutral Pterin Tautomers

Theoretical Study on the Relative Energies of Neutral Pterin Tautomers
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中性蝶呤互变异构体相对能量的理论研究

DOI:
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发表时间:
2008
期刊:
影响因子:
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通讯作者:
Christopher B. Martin
Christopher B. Martin
中科院分区:
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文献类型:
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作者:
M. Soniat;Christopher B. Martin

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摘要目前的文献中,内酰胺和内酰亚胺互变异构体是水溶性蝶呤结构的唯一主要贡献者。密度泛函理论计算用于确定是否有其他重要的中性互变异构体的蝶呤参与光化学和生物系统以外的内酰胺和内酰亚胺形式在水介质中。计算表明,内酰胺互变异构体是能量最低的结构,而与内酰胺结构相比,内酰亚胺结构的能量高于预期(1.66 kcal/mol)。另外三种中性蝶呤结构的计算值比最稳定的内酰胺高出不到104 kcal/mol,因此也应该被认为是可能在化学和生物蝶呤系统中发挥重要作用的结构。
Abstract Current literature lists the lactam and lactim tautomers as the only major contributors to aqueous pterin structures. Density functional theory calculations were used to determine whether there are other significant neutral tautomers of pterin participating in photochemical and biological systems other than the lactam and lactim forms in aqueous media. Calculations showed that the lactam tautomer is the lowest energy structure while the lactim structure is higher in energy than expected (∼6 kcal/mol) compared to the lactam structure. Three other neutral pterin structures were calculated to be less than ∼4 kcal/mol above the most stable lactam and therefore should also be considered as structures which possibly play an important role in chemical and biological pterin systems.
DOI: 10.1016/j.jmb.2005.06.076
发表时间: 2005-09-09
影响因子: 5.6
作者:
Schüttelkopf, AW;Hardy, LW;Hunter, WN
通讯作者: Hunter, WN
DOI: 10.1073/pnas.85.7.2046
发表时间: 1988-04-01
影响因子: 11.1
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期刊: BIOCHEMISTRY
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