Increasing the Chemical-Shift Dispersion of Unstructured Proteins with a Covalent Lanthanide Shift Reagent.

Increasing the Chemical-Shift Dispersion of Unstructured Proteins with a Covalent Lanthanide Shift Reagent.
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DOI:
10.1002/anie.201607261
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发表时间:
2016-11-14
影响因子:
16.6
通讯作者:
Madl, Tobias
Madl, Tobias
中科院分区:
化学1区
文献类型:
--
作者:
Goebl, Christoph;Resch, Moritz;Strickland, Madeleine;Hartlmueller, Christoph;Viertler, Martin;Tjandra, Nico;Madl, Tobias

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用核磁共振研究内在无序蛋白质(IDPs)经常遇到高度重叠的共振,这阻碍了明确的化学位移分配,以及依赖于良好分离的共振的数据分析。我们提出了一种共价顺磁性稀土结合标签(LBT),用于增加化学位移的分散性,并促进具有挑战性的、含有重复序列的IDPs的化学位移分配。将基于DOTA的LBT连接到半胱氨酸残基上会导致自旋标记位置上20多个残基的共振产生伪接触位移(PCS)。这导致化学位移的分散性增加,信号重叠减少,从而极大地促进了化学位移的分配。这种办法适用于不同规模和复杂程度的境内流离失所者,特别是对重复出现的境内流离失所者和复杂性较低的地区。这提高了IDP分析和结合研究的效率。
The study of intrinsically disordered proteins (IDPs) by NMR often suffers from highly overlapped resonances that prevent unambiguous chemical‐shift assignments, and data analysis that relies on well‐separated resonances. We present a covalent paramagnetic lanthanide‐binding tag (LBT) for increasing the chemical‐shift dispersion and facilitating the chemical‐shift assignment of challenging, repeat‐containing IDPs. Linkage of the DOTA‐based LBT to a cysteine residue induces pseudo‐contact shifts (PCS) for resonances more than 20 residues from the spin‐labeling site. This leads to increased chemical‐shift dispersion and decreased signal overlap, thereby greatly facilitating chemical‐shift assignment. This approach is applicable to IDPs of varying sizes and complexity, and is particularly helpful for repeat‐containing IDPs and low‐complexity regions. This results in improved efficiency for IDP analysis and binding studies.
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