On the treatment of conformational flexibility when using residual dipolar couplings for structure determination.

On the treatment of conformational flexibility when using residual dipolar couplings for structure determination.
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关于使用残余偶极耦合进行结构测定时构象灵活性的处理

DOI:
10.1002/anie.200902398
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
B. Stevensson
B. Stevensson
中科院分区:
--
文献类型:
--
作者:
C. M. Thiele;V. Schmidts;B. Böttcher;I. Louzao;R. Berger;A. Maliniak;B. Stevensson

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利用核磁共振波谱法测定有机和生物分子化合物的三维结构,通常包括测量3J耦合常数、[1]NOEs、[2]和交叉相关弛豫[3],分别获得二面角、距离和投影角的信息。如果构象的相互转换发生并且在核磁共振时间尺度上是快速的,则分子的柔性部分的核磁共振波谱参数是动态平均的。这种效应是测定非刚性分子结构的主要难题之一,常常妨碍测定有机化合物的相对构型。研究表明,对于有机化合物[4-10],残余偶极耦合(rdc)也可以产生与3J耦合常数和NOE参数所获得的信息互补的信息,并且即使存在有限的运动程度,也可以分配相对构型。[11-15]残差偶极耦合用于结构确定时,未知构型和构象平均的联合处理问题
The determination of the three-dimensional structure of organic and biomolecular compounds by NMR spectroscopy usually involves the measurement of 3J coupling constants,[1] NOEs,[2] and cross-correlated relaxation [3] to obtain information about dihedral angles, distances, and projection angles, respectively. If interconversion of conformers takes place and is fast on the NMR time scale, NMR spectroscopic parameters for flexible parts of the molecule are motionally averaged. This effect is one of the main complications in the structure determination of nonrigid molecules and often prohibits the determination of the relative configuration of organic compounds.It has been shown that residual dipolar couplings (RDCs) can yield information complementary to that obtained from 3J coupling constants and NOE parameters also for organic compounds [4–10] and enable the assignment of relative configurations even in the presence of a limited degree of motion.[11–15] The problem of the joint treatment of an unknown configuration and conformational averaging when residual dipolar couplings are used in structure determination
从残余偶极耦合中提取的分子结构:溶解在向列液晶中的二苯甲烷。
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