Department of NMR-Based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany.
J Biomol NMR. 2011 Nov;51(3):329-37. doi: 10.1007/s10858-011-9560-y. Epub 2011 Sep 4.
Here we present Cys-Ph-TAHA, a new nonadentate lanthanide tag for the paramagnetic labelling of proteins. The tag can be easily synthesized and is stereochemically homogenous over a wide range of temperatures, yielding NMR spectra with a single set of peaks. Bound to ubiquitin, it induced large residual dipolar couplings and pseudocontact shifts that could be measured easily and agreed very well with the protein structure. We show that Cys-Ph-TAHA can be used to label large proteins that are biochemically challenging such as the Lac repressor in a 90 kDa ternary complex with DNA and inducer.
在这里,我们介绍了 Cys-Ph-TAHA,这是一种新的非齿合镧系元素标签,用于蛋白质的顺磁标记。该标签可以很容易地合成,并且在很宽的温度范围内具有立体化学均一性,产生的 NMR 谱具有单一的峰组。与泛素结合后,它诱导了大的残余偶极耦合和赝接触位移,这些可以很容易地测量,并与蛋白质结构非常吻合。我们表明,Cys-Ph-TAHA 可以用于标记生物化学挑战性较大的大蛋白,如与 DNA 和诱导物形成三元复合物的 90 kDa 乳糖阻遏物。