Accuracy in determining interproton distances using Nuclear Overhauser Effect data from a flexible molecule.

Accuracy in determining interproton distances using Nuclear Overhauser Effect data from a flexible molecule.
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DOI:
10.3762/bjoc.7.20
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发表时间:
2011-02-01
影响因子:
2.7
通讯作者:
Harvey JN
Harvey JN
中科院分区:
化学4区
文献类型:
--
作者:
Jones CR;Butts CP;Harvey JN

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以4-丙基苯胺为模型化合物,研究了noe衍生质子间距离的精确测定和多构象柔性小分子中相对居群的确认/预测。通常认为,半定量NOE距离约束的低精度表明,在柔性分子的动力学分析中需要使用大量的约束,例如,这需要对标量耦合常数(3JCH和3JHH)进行测量和karplus型分析。在这里,我们证明,与这种普遍的看法相反,NOE测量本身就足够精确,可以在柔性分子中建立质子间距离,从而建立构象细节,在其总体平均值的几个百分点之内,从而减少了对此类动态分析中附加约束的需求。
The determination of accurate NOE-derived interproton distances and confirmation/prediction of relative populations in multi-conformer, flexible small molecules was investigated with the model compound 4-propylaniline. The low accuracy assumed for semi-quantitative NOE distance restraints is typically taken to suggest that large numbers of constraints need to be used in the dynamical analysis of flexible molecules, and this requires, for example, the measurement and Karplus-type analysis of scalar coupling constants (3JCH and 3JHH). Herein we demonstrate that, contrary to this common perception, NOE measurements alone are accurate enough to establish interproton distances, and hence conformational detail, in flexible molecules to within a few percent of their ensemble-averaged values, hence reducing the demand for additional restraints in such dynamic analyses.
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